Abdelaziz EL GAMOUZ

Abdelaziz EL GAMOUZ

University of Sharjah

H-index: 13

Asia-United Arab Emirates

Abdelaziz EL GAMOUZ Information

University

University of Sharjah

Position

___

Citations(all)

675

Citations(since 2020)

540

Cited By

248

hIndex(all)

13

hIndex(since 2020)

12

i10Index(all)

19

i10Index(since 2020)

17

Email

University Profile Page

University of Sharjah

Abdelaziz EL GAMOUZ Skills & Research Interests

Biosensors utilizing macro-

micro- and nanomaterials for health

environmental monitoring and improved industrial process contr

Top articles of Abdelaziz EL GAMOUZ

Preparation and characterization of clay based ceramic porous membranes and their use for the removal of lead ions from synthetic wastewater with an insight into the removal …

The present study explores the use of local clay from the United Arab Emirates (UAE) to prepare porous ceramic membranes (flat disk shape) for the purpose of removing toxic heavy metals from contaminated water. Four distinct ceramic membranes, crafted from locally sourced clay and incorporated with activated carbon and graphite, underwent careful and thorough preparation. The initial set of membranes was subjected to open-air sintering, resulting in the creation of mACA and mGrA membranes. Concurrently, a second set of meticulously prepared membranes underwent sintering under inert nitrogen conditions, yielding the formation of mACI and mGrI membranes, respectively. Prior to making the membranes, the clay material was characterized by thermogravimetric analysis (TGA), X-ray fluorescence (XRF), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffraction analysis (XRD). The clay …

Authors

Abdelrahman KA Khalil,Abdelaziz Elgamouz,Saad Nazir,Muataz Ali Atieh,Hussain Alawadhi,Tahar Laoui

Journal

Heliyon

Published Date

2024/2/15

Manufacturing of novel zeolite-clay composite membrane from natural clay and diatomite, an electrochemical study of the surface and application towards heavy metals removal

This work discusses the preparation of a clay-support and LTA-composite membrane from two natural materials, diatomite, and clay. Pellets of 40 mm diameter were prepared from a mixture of clay powder with granulometry, 160 µm ≤ Φ ≤ 250 µm, and 3 wt.% activated carbon as porosity agent, using the powder metallurgy technique. The developed supports were sintered at final temperatures of 1000°C and characterized by water flow tests using a filtration flow-loop prior to LTA membrane deposition. The natural diatomite was treated at 350°C, to eliminate its organic matter content prior to its utilization as silica precursor. The Si/Al molar ratio dropped from 2.2, to 1.2 by increasing the aluminate precursor to obtain the LTA zeolite, the mixture thus obtained is placed in a polytetrafluoroethylene autoclave containing the sintered support and the synthesis is carried out at 80°C. The resulting LTA zeolite was …

Authors

Abderrazek El-Kordy,Abdelaziz Elgamouz,Ayman Abdelhamid,Abdel-Nasser Kawde,Najib Tijani

Journal

Journal of Environmental Chemical Engineering

Published Date

2024/2/7

Polypyrrole-coated three-dimensional graphenized surface for superior supercapacitor performance

A highly electrochemically active graphene/polypyrrole electrode is developed using a facile two-step method comprising top-down and bottom-up electrochemical processing of a graphite electrode, resulting in polypyrrole deposition into a three-dimensional surface graphene host matrix. The active surface graphene/polypyrrole layer is directly connected to the core graphite current collector with no need for external binders. The graphene/polypyrrole electrode is optimized by controlling the polypyrrole deposition via tuning the electrodeposition voltage and duration. The highly functional electrodes are tested as supercapacitors showing excellent performance with an areal capacitance of > 1400 mF/cm2 and a high rate capability of ~ 141 mF/cm2 at 20 mA/cm2. A symmetric cell based on the optimal electrode achieved ~ 213 mF/cm2 at 0.25 mA/cm2 with a high stability of ~ 90% after 2500 cycles. The high …

Authors

Ayman A AbdelHamid,Abdelaziz Elgamouz,Abdel-Nasser Kawde

Journal

Arabian Journal for Science and Engineering

Published Date

2024/1

Controlled electrochemical surface exfoliation of graphite pencil electrodes for high-performance supercapacitors

A controlled surface exfoliation method for graphite pencil electrodes using an environmentally friendly, low cost and scalable electrochemical process is reported. A simple direct current power supply in a neutral medium is used for inducing graphene formation on the electrode surface in a controlled manner. The electrochemical properties of the surface exfoliated electrode are characterized, displaying a >300× increase in the electrochemical surface area and >50× decrease in the electrode resistance after exfoliation. The surface graphene layer is characterized using electron microscopy, Raman, infrared, X-ray photoelectron, and energy dispersive X-ray spectroscopies and X-ray diffractometry showing a fully exfoliated surface, formation of surface defects and mild surface graphene oxidation while maintaining an intact graphitic crystal structure. The surface exfoliated electrode is tested as a supercapacitor …

Authors

Ayman A AbdelHamid,Abdelaziz Elgamouz,Abdel-Nasser Kawde

Journal

RSC advances

Published Date

2023

β-Cyclodextrin-Functionalized Fe3O4-Supported Pd-Nanocatalyst for the Reduction of Nitroarenes in Water at Mild Conditions

In this study, a novel heterogeneous catalyst (Fe3O4@β-CD@Pd) has been developed by the deposition of palladium nanoparticles on the β-cyclodextrin-functionalized surface of magnetic Fe3O4. The catalyst was prepared by a simple chemical co-precipitation method and characterized extensively by using Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma-optical emission spectrometry (ICP-OES) analyses. Herein, the applicability of the prepared material was evaluated for the catalytic reduction of environmentally toxic nitroarenes to the corresponding anilines. The catalyst Fe3O4@β-CD@Pd showed excellent efficiency for the reduction of …

Authors

Kamrul Hasan,Ihsan A Shehadi,Reshma G Joseph,Shashikant P Patole,Abdelaziz Elgamouz

Journal

ACS omega

Published Date

2023/6/22

Antitumor effect of algae silver nanoparticles on human triple negative breast cancer cells

In recent years, metallic nanoparticles have gained increasing attention due to their prospective applications in the field of nanomedicine, with increasing research into their use in cancer therapy. In this current research, we investigated the effect of green synthesized Silver Nanoparticles (AgNPs) capped with Noctiluca scintillans algae extract. The phytochemicals present in the shell of AgNPs were identified using GC-MS. Different compounds with anticancer activity such as n-hexadecanoic acid, beta-sitosterol, stigmasterol and palmitic acid were detected among others. The effects of Algae-AgNPs synthesized were tested on MDA-MB-231 human breast cancer cells and HaCat human keratinocyte normal cells. Cell viability assay revealed a time and dose-dependent effect against breast cancer cells with a less potent effect against normal cells. The cell viability reduction is not attributed to a cytotoxic nor an …

Authors

Rawan Salih,Khalid Bajou,Baraah Shaker,Abdelaziz Elgamouz

Published Date

2023/12/1

Green synthesis of CuO nanoparticles using Hibiscus sabdariffa L. extract to treat wastewater in Soba Sewage Treatment Plant, Sudan

Looking for a cost-effective and ecofriendly method for wastewater treatment is a global challenge. Therefore, this study investigated the removal of wastewater pollutants using copper oxide nanoparticles (CuONPs). CuONPs synthesized by a green solution combustion synthesis (SCS) and characterized by ultraviolet–visible spectroscopy (UV–Vis), Fourier transform infrared (FT-IR), powder X-ray diffraction analysis (PXRD), and scanning electron microscopy (SEM) techniques. PXRD showed nanoparticle sizes ranging from 10 to 20 polycrystalline patterns indexed with two peaks corresponding to (111) and (113) reflections of the face-centered cubic CuO crystal. The energy-dispersive spectroscopy analysis obtained in conjunction with SEM analysis proved the presence of Cu and O atoms at 86.3 and 13.6%, respectively, confirming the reduction and capping of Cu with Hibiscus …

Authors

Samaher RE Almisbah,Abdelhafeez MA Mohammed,Abdelaziz Elgamouz,Alaa Bihi,Abdelnasser Kawde

Journal

Water Science & Technology

Published Date

2023/6/15

Processing and Characterization of UAE Clay Ceramic Membranes for Water Treatment Applications

The scarcity of drinking water is currently a critical issue in many parts of the world. Providing clean/urgent longer limited to natural sources. Wastewater treatment has become an urgent necessity in many countries, particularly in the Middle East and North African regions characterized by a desert climate. Hence, the development of effective methods for wastewater treatment is vital to overcome this water shortage. The present study attempts to explore the use of local clay from the United Arab Emirates (UAE) to prepare porous ceramic membranes (flat disk shape) for the purpose of removing toxic heavy metals from contaminated water. Two types of ceramic membranes were prepared by powder metallurgy method; the first type was prepared by uniaxial compression of the clay powder with particle size ≤ 250 μm, followed by sintering. The second type of membrane was composed of an activated carbon/clay …

Authors

Abdelrahman Khalil Abdelrazek Khalil,Abdelaziz Elgamouz,Muataz Ali Atieh,Abdallah Shanableh,Tahar Laoui

Journal

Advances in Science and Technology

Published Date

2023/9/29

COVID-19 chloroquine drug detection using novel, highly sensitive SnO2-based electrochemical sensor

A highly sensitive, selective, stable, and cost-effective SnO 2-based electrochemical sensor is reported for the detection of chloroquine phosphate (CQP). Hydrothermal synthesis is used to synthesize SnO 2 nanoparticles, which are mixed with graphite and form a highly electrochemically active composite. The SnO 2 nanoparticles and SnO 2/graphite composite are fully characterized physico-and electrochemically. Using the optimal SnO 2/graphite composite, an excellent analytical performance is demonstrated with an electrode sensitivity of 35.7 µA/µM. cm 2, a linear range of 0.1–23.3 µM, and limits of detection and quantification of 0.01 µM and 0.04 µM, respectively. High CQP selectivity with minimal interference at 100× concentration of interferents is shown. The sensor is also highly repeatable and reproducible with RSD of 2.46% and 1.86%, respectively, and can retain> 85% of its activity upon storage. The …

Authors

Ayman AbdelHamid,Abdelaziz Elgamouz,Monther Khanfer,Abdel-Nasser Kawde

Journal

Arabian Journal of Chemistry

Published Date

2023/5/1

Multi-functional silver nanoprism-titanium dioxide hybrid nanoarrays for trace-level SERS sensing and photocatalytic removal of hazardous organic pollutants

Owing to the excellent optoelectronic properties of metal nanoparticle-semiconductor interfaces; hybrid substrates with superior catalytic and sensing properties can be designed. In the present study, we have attempted to evaluate anisotropic silver nanoprisms (SNP) functionalized titanium dioxide (TiO2) particles for multifunctional applications such as SERS sensing and photocatalytic decomposition of hazardous organic pollutants. Hierarchical TiO2/SNP hybrid arrays have been fabricated via facile and low-cost casting techniques. The structural, compositional, and optical characteristics of TiO2/SNP hybrid arrays were well elucidated and correlated to SERS activities. SERS studies revealed that TiO2/SNP nanoarrays possess almost 288 times enhancement compared to bare TiO2 substrates and 2.6 times enhancement than pristine SNP. The fabricated nanoarrays demonstrated detection limits down to 10-12 …

Authors

Rania Ziad,Soumya Columbus,Abdelaziz Elgamouz,Kais Daoudi,Abdel-Nasser Kawde,Krithikadevi Ramachandran,Mounir Gaidi

Journal

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

Published Date

2023/9/5

Modified Graphite Pencil Electrode Based on Graphene Oxide-Modified Fe3O4 for Ferrocene-Mediated Electrochemical Detection of Hemoglobin

This study describes the synthesis of graphene oxide-modified magnetite (rGO/Fe3O4) and its use as an electrochemical sensor for the quantitative detection of hemoglobin (Hb). rGO is characterized by a 2θ peak at 10.03° in its X-ray diffraction, 1353 and 1586 cm–1 vibrations in Raman spectroscopy, while scanning electron microscopy coupled with energy-dispersive spectroscopy of rGO and rGO/Fe3O4 revealed the presence of microplate structures in both materials and high presence of iron in rGO/Fe3O4 with 50 wt %. The modified graphite pencil electrode, GPE/rGO/Fe3O4, is characterized using cyclic voltammetry. Higher electrochemical surface area is obtained when the GPE is modified with rGO/Fe3O4. Linear scan voltammetry is used to quantify Hb at the surface of the sensor using ferrocene (FC) as an electrochemical amplifier. Linear response for Hb is obtained in the 0.1–1.8 μM range with a …

Authors

Abdelaziz Elgamouz,Abdel-Nasser Kawde,Ihsan A Shehadi,Sareh Sayari,Sarah Ali Abdullah Mohammed,Aya Abdelrazeq,Chahlaa Naser Nassab,Ayman A AbdelHamid,Kamrul Hasan

Journal

ACS omega

Published Date

2023/3/24

Copper enhanced guanine electrochemical signal for nucleic acids detection in municipal tertiary wastewater

An electroanalytical method is developed for guanine detection based on its electrochemical oxidation on a clay-modified carbon paste electrode (clay-CPE). The electrochemical guanine signal is found to be significantly enhanced upon its complexation with Cu2+ ions. Cu2+-guanine complex formation is studied using UV–Vis spectroscopy and electrochemical pulse voltammetry at different ratios, with 1:2 Cu2+:guanine found to be the optimal stoichiometry. The clay modifier and the electrode are fully characterized using electron microscopy, Fourier-transform infrared, X-ray photoelectron and X-ray fluorescence spectroscopies, and X-ray diffractometry. The analytical method is fully optimized regarding the electrolyte, technique, and electrochemical parameters. A calibration curve is built obtaining a linear range of 0.1–45 µM, a limit of detection of 0.16 µM, a limit of quantification of 0.54 µM, and a sensitivity of 1.1 …

Authors

Ayat Al Nimer,Abdel-Nasser Kawde,Abdelaziz Elgamouz,Ihsan Shehadi,Ayman AbdelHamid

Journal

Arabian Journal of Chemistry

Published Date

2023/9/1

Prediction of a natural clay membrane selectivity towards heavy metal cations removal from wastewater: An electrochemical study

Heavy metals such as cadmium (Cd), lead (Pb), mercury (Hg), and copper (Cu) are among the most toxic environmental pollutants due to their non-biodegradability, high toxicity, and major health-related risks. This study presents the implementation of electrochemical approaches to predict the selectivity of clay membranes towards heavy metal cations and explore their suitability for efficient water filtration. The clay membranes are processed into carbon paste electrodes (CPEs) and used as platforms for electrochemical assessments to investigate their selectivity towards the filtration of heavy metal cations, using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and linear sweep anodic stripping voltammetry (LSASV). CV showed that Clay-CPE5@1000 °C (5 wt.% of clay) demonstrated the highest peak current. Furthermore, the Nyquist plot for Clay-CPE5@1000 °C exhibited the highest …

Authors

Lubna Jaber,Ayman A AbdelHamid,Abdelaziz Elgamouz,Abdel-Nasser Kawde

Journal

Journal of Solid State Electrochemistry

Published Date

2023/12/15

NaA zeolite-clay composite membrane formulation and its use as cost-effective water softener

The present study describes the exchange of calcium and magnesium ions through an active layer of zeolite Na-A deposited on flat porous support made from clay. Microfiltration membrane's supports are prepared by uniaxial pressing dry mixture of clay, and 3% w/w activated carbon then sintered to 1000 °C. The zeolite Na-A (LTA) layer is deposited on the clay support using the hydrothermal method. An increase in the specific surface area and the pore volume and a decrease in pore diameter after deposition of the zeolite Na-A on the support is observed. SEM analysis of the zeolite Na-A shows well-defined cubic crystals with sizes between 1.3 and 2.4 μm. The efficiency of the zeolite membrane for the exchange of calcium and magnesium ions with the sodium (Na) within the zeolite-A cavities was evaluated by filtration tests of solutions containing chlorides salts of the two metals using a flow loop adjusted for …

Authors

Adnane Lahnafi,Abdelaziz Elgamouz,Lubna Jaber,Najib Tijani,Abdel-Nasser Kawde

Journal

Microporous and Mesoporous Materials

Published Date

2023/1/15

Development and characterization of a clay-HDTMABr composite for the removal of Cr (VI) from aqueous solutions with special emphasis on the electrochemical interface

This research aims to study the removal of chromium in its toxic form, Cr (VI), from wastewater, using clay and modified clay with Hexadecyltrimethyl ammonium bromide (HDTMABr)as adsorbents. The modified clay is obtained by impregnating a known quantity of HDTMABr into the clay. The two materials were characterized by different techniques, such as X-ray diffraction, which is used to determine the inorganic composition and the phyllite structures it contains. Thermal analysis TGA isused to understand the thermal behavior as function of the sintering temperature. Nitrogen adsorption/desorption is used to get the pores' size and surface area, using the Brunauer-Emmett-Teller (BET) theory. Scanning electron microscopy (SEM) coupled with Energy Dispersive X-ray Spectroscopy (SEM/EDAX) is used to study the surface morphology of the bare clay and the HDTMABr/clay. The operating conditions, such as …

Authors

Abderrazek El-Kordy,Abdelaziz Elgamouz,Awad A Alrashdi,Abderrahim Kali,Ayman Abdelhamid,Abdel-Nasser Kawde,Najib Tijani

Journal

Arabian Journal of Chemistry

Published Date

2023/8/1

Enhanced Supercapacitor Performance of Polypyrrole-Coated Graphenized Electrode by Tuning Electrodeposition Technique

The influence of the electrodeposition technique of polypyrrole (PPy) into a three-dimensional graphenized surface on the electrode's physicochemical properties and supercapacitor performance is studied. Three different PPy electrodeposition techniques, potentiodynamic, galvanostatic, and pulse deposition, are investigated, optimized, and compared to the optimal potentiostatic method developed in our previous work. The PPy film morphology, density, homogeneity, and chemical structure are found to be affected by the electrodeposition technique and parameters. Potentiodynamic deposition at 25 mV/s results in the highest areal capacitance of 692.3 mF/cm2, while that at 100 mV/s results in the highest capacity retention of 90.1%. The lowest total electrode resistance of 13.8 Ω and the highest rate capability of 143.2 mF/cm2 at 40 mA/cm2 are both achieved by the galvanostatic method at a current density of 4 …

Authors

Ayman A AbdelHamid,Abdelaziz Elgamouz,Abdel-Nasser Kawde

Journal

Arabian Journal for Science and Engineering

Published Date

2023/12/7

Hydrothermal synthesis and electrochemical characterization of novel zeolite membranes supported on flat porous clay-based microfiltration system and its application of heavy …

The present work describes the synthesis and characterization of a zeolite type LTA-clay composite membrane on pre-existing locally organized aluminosilicate in clay support and its application to the removal of heavy metals. X-ray diffraction reveals that the natural clay consists essentially of quartz, kaolinite, illite, dolomite, and calcite phases. Flat discs, membrane supports are prepared by uniaxial pressing of natural clay with 160 ≤ Ф < 250 μm as optimal grain size mixed with 3% w/w activated carbon as porogen agent. Membrane supports are consolidated by sintering to final temperatures of 1000 °C. Zeolite Linde type A (LTA) is deposited on the clay supports using the hydrothermal method. Nitrogen adsorption analysis of the support using Brunauer–Emmett–Teller (BET) theory showed pores with 35.5 nm, which is narrowed to 14.2 nm after zeolite-A deposition. X-ray analysis of the composite membrane …

Authors

Adnane Lahnafi,Abdelaziz Elgamouz,Najib Tijani,Lubna Jaber,Abdel-Nasser Kawde

Journal

Microporous and Mesoporous Materials

Published Date

2022/3/1

Graphene nanosheet-sandwiched platinum nanoparticles deposited on a graphite pencil electrode as an ultrasensitive sensor for dopamine

An ultra-sensitive sensor of dopamine is introduced. The sensor is constructed by encapsulating platinum nanoparticles (PtNPs) between reduced graphene oxide (GR) nanosheets. The sandwiched PtNPs between GR layers acted as a spacer to prevent aggregation and provided a fine connection between the GR nanosheets to provide fast charge transfer. This specific orientation of the GR nanosheets and PtNPs on the graphite pencil electrode (GPE) substantially improved the electrocatalytic activity of the sensor. The synthesized graphene oxide and the fabricated sensor were comprehensively characterized by Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, field emission-scanning electron microscopy (FE-SEM), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and square wave voltammetry (SWV). The value of the charge transfer coefficient (α), apparent …

Authors

Nadeem Baig,Abdel-Nasser Kawde,Abdelaziz Elgamouz,Mohamed Morsy,Ahmed Mohsen Abdelfattah,Rizafizah Othaman

Journal

RSC advances

Published Date

2022

An insight to the filtration mechanism of Pb (II) at the surface of a clay ceramic membrane through its preconcentration at the surface of a graphite/clay composite working …

The use of cyclic voltammetry (CV) and linear scan anodic stripping voltammetry (LSASV) to predict the selectivity of microfiltration ceramic membranes made from a lump of local clay towards Pb(II) ions filtration is described. The membranes were characterized by different techniques followed by CV analysis of the Fe(CN)63-/Fe(CN)64- redox couple and Pb(II) on bare graphite, raw clay, and clay-modified carbon paste electrode (clay-modified CPE). The effect of clay loading in the range of 1–10 % (w/w) on the electrodes is studied, where an enhanced peak current is observed for 5 % w/w clay. Moreover, a decrease in the peak current can be seen for bare graphite electrodes, suggesting that the clay mineral had played a substantial role in the sieving of heavy metal ions through the ceramic membrane. The electroactive surface area of 5% w/w raw clay towards Fe(II) ions was found to be in the order of 3.07 × 10-2 …

Authors

Lubna Jaber,Abdelaziz Elgamouz,Abdel-Nasser Kawde

Journal

Arabian Journal of Chemistry

Published Date

2022/12/1

Magnetic silica surface functionalized palladium catalyst: a modular approach for CC cross-coupling reactions in water

A novel Pd immobilized catalyst has been prepared via surface modification of magnetic silica and characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), UV–Vis spectroscopy, X-ray diffractometer (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM) and inductively coupled plasma-optical emission spectrometry (ICP-OES) analysis. The prepared composite material found to be highly efficient and recyclable heterogeneous catalyst for the Suzuki coupling reaction in aqueous medium with high turnover number (TON) of 1138 and turnover frequency (TOF) of 2276 h−1. The Pd content of the catalyst was 0.09 mol% and afforded excellent to good yield of biaryls from a wide variety of aryl halides, including electron- withdrawing and releasing groups. The catalyst was reused up to six cycles …

Authors

Kamrul Hasan,Ihsan A Shehadi,Karimatu Ahmed Bagudu,Neil Osama Mohamed Elmabrouk,Abdelaziz Elgamouz,Shashikant P Patole,Raed A Al-Qawasmeh

Journal

Applied Surface Science

Published Date

2022/1/1

A cost-effective disposable graphene-based sensor for sensitive and selective detection of uric acid in human urine

A rapid and facile method has been developed for uric acid (UA) sensing in human urine. The graphite pencil electrode's (GPE) sensitivity and electrochemical activity for sensing uric acid in human urine were enhanced by the electrochemically reduced graphene oxide on GPE in acetate buffer (ac-dERGO-GPE). Acetate, medium-supported graphene oxide reduction, is more facile, fast, and sensitive than water-dispersed graphene oxide. The surface of the modified and bare electrode was thoroughly investigated using the Fourier transform-infrared (FTIR), Field emission-scanning electron microscopy (FE-SEM), cyclic voltammetry (CV), square wave voltammetry (SWV), and electrochemical impedance spectroscopy (EIS). The electroactive surface area of the modified electrode was significantly improved from 0.0686 cm2 to 0.3615 cm2. The graphene layers greatly enhanced the electroactive surface area and the …

Authors

Nadeem Baig,Abdel-Nasser Kawde,Abdelaziz Elgamouz

Journal

Biosensors and Bioelectronics: X

Published Date

2022/9/1

Cinnamon extract’s phytochemicals stabilized Ag nanoclusters as nanozymes “peroxidase and xanthine oxidase mimetic” for simultaneous colorimetric sensing of H2O2 and xanthine

Green and cost-effective technique for the preparation of silver nanoparticles stabilized with cinnamon’s phytochemicals (CIN-AgNPs) as H2O2 and xanthine nonozyme is described in the present study. Cinnamon’s phytochemicals played the role of effective reducing agents as well as stabilizers of the silver. Nanoparticles were obtained in an optimum time of 90 min at room temperature. The optimum pH was found to be the normal pH of the plant extract (pH = 4.5). High Resolution Transmission Electron Microscopy (HRTEM) showed that most of the particles were regular spherical shaped with particle sizes ranging from 10.0 to 70.0 nm. The patterns were indexed as (111), (200), (220) and (311) reflections of the FCC silver crystal based on their d-spacing of 2.47, 2.13, 1.49 and 1.27 Å respectively. CIN-AgNPs test showed the peroxidase enzyme like activity in the absence of 3,3′,5,5′-tetramethylbenzidine …

Authors

Abdelaziz Elgamouz,Abdelnasser Kawde,Salman S Alharthi,Marwa Laghoub,Dina Miqlid,Chahlaa Nassab,Khalid Bajou,Shashikant P Patole

Journal

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Published Date

2022/8/20

Learning Chemistry at the University of Sharjah: Before, During, and After the COVID-19 Pandemic

This study attempts to analyze the students’ satisfaction with learning chemistry before, during, and after the COVID-19 pandemic at the University of Sharjah. Microsoft Forms were used to build the questionnaire and collect the data. The widely used online class applications are Blackboard Ultra, Microsoft Teams, Zoom, and WhatsApp Group features. Students had printed textbooks, e-books, and lecture notes posted under Blackboard contents as learning media. The Chemistry laboratories were carried out in a hybrid mode during the pandemic; 30% of the experiments were conducted face-to-face inside the University in an alternate mode, while the remaining 70% were conducted virtually using home-developed videos, McGraw Hill simulation, or Journal of Visual Experiments platforms. Most students experienced challenges implementing the online learning process, so they prefer the usual traditional learning methods. In addition, the assessment of the educational program learning outcomes (PLO) was measured over the last three academic years, 2019, 2020, and 2021. Results of such an assessment indicated that there is a decline in the skill outcomes B, C, and E during the COVID-19 era. The study recommends the adoption of Flex-Hybrid Classrooms, using interactive online class applications like face-to-face learning, as hybrid learning can contribute positively to the quality assurance process of the instructional methodologies. Chemistry Laboratories must be conducted in person to enhance the technical and hands-on experience skills of students. All classes, regardless of delivery mode, should be recorded, as they can contribute …

Authors

Abdel-Nasser Kawde,Abdelaziz Elgamouz,Ihsan Shehadi

Published Date

2022/3/14

Encapsulation capacity of β-cyclodextrin stabilized silver nanoparticles towards creatinine enhances the colorimetric sensing of hydrogen peroxide in urine

The β-cyclodextrin shell of synthesized silver nanoparticles (βCD-AgNPs) are found to enhance the detection of hydrogen peroxide in urine when compared to the Horse Radish Peroxidase assay kit. Nanoparticles are confirmed by the UV-Vis absorbance of their localized surface plasmonic resonance (LSPR) at 384 nm. The mean size of the βCD-AgNPs is 53 nm/diameter; XRD analysis shows a face-centered cubic structure. The crystalline structure of type 4H hexagonal nature of the AgNPs with 2.4 nm β-CD coating onto is confirmed using aberration corrected high-resolution transmission electron microscopy (HRTEM). A silver atomic lattice at 2.50 Å and 2.41 Å corresponding to (100) and (101) Miller indices is confirmed using the HRTEM. The scope of βCD-AgNPs to detect hydrogen peroxide (H2O2) in aqueous media and human urine is investigated. The test is optimized by examining the effect of volumes of nanoparticles, the pH of the medium, and the kinetic and temperature effect on H2O2 detection. The βCD-AgNPs test is used as a refined protocol, which demonstrated improved sensitivity towards H2O2 in urine compared to the values obtained by the Horse Radish Assay kit. Direct assessment of H2O2 by the βCD-AgNPs test presented always with a linear response in the nM, μM, and mM ranges with a limit of detection of 1.47 nM and a quantitation limit of 3.76 nM. While a linear response obtained from 1.3 to 37.3 nmoles of H2O2/mole creatinine with a slope of 0.0075 and regression coefficient of 0.9955 when the βCD-AgNPs is used as refined test of creatinine. Values ranging from 34.62 ± 0.23 nmoles of H2O2/mole of creatinine …

Authors

Abdelaziz Elgamouz,Chahlaa Nassab,Alaa Bihi,Somaya AI Mohamad,Aisha HSA Almusafri,Salman S Alharthi,Sarah AE Abdulla,Shashikant P Patole

Journal

Nanomaterials

Published Date

2021/7/24

Preparation of sodalite and faujasite clay composite membranes and their utilization in the decontamination of dye effluents

The present work describes the deposition of two zeolite films, sodalite and faujasite, by the hydrothermal method to tune the mesopores of clay support, which are prepared from a widely available clay depot from the central region of Morocco (Midelt). The clay supports were prepared by a powder metallurgy method from different granulometries with activated carbon as a porosity agent, using uniaxial compression followed by a sintering process. The 160 µm ≤ Φ ≤ 250 µm support showed the highest water flux compared to the supports made from smaller granulometries with a minimum water flux of 1405 L.m−2·h−1 after a working time of 2 h and 90 min. This support was chosen for the deposition of sodalite (SOM) and faujasite (FAM) zeolite membranes. The X-ray diffraction of sodalite and faujasite showed that they were well crystallized, and the obtained spectra corresponded well with the sought phases. Such findings were confirmed by the SEM analysis, which showed that SOM was crystalized as fine particles while the FAM micrographs showed the existence of crystals with an average size ranging from 0.53 µm to 1.8 µm with a bipyramidal shape and a square or Cubo octahedral base. Nitrogen adsorption analysis showed that the pore sizes of the supports got narrowed to 2.28 nm after deposition of sodalite and faujasite. The efficiencies of SOM and FAM membranes were evaluated by filtration tests of solutions containing methyl orange (MO) using a flow loop, which were developed for dead-end filtration. The retention of methylene orange (MO) followed the order: SOM > FAM > 160 µm ≤ Φ ≤ 250 µm clay support with 55%, 48% and …

Authors

Abderrazek El-Kordy,Abdelaziz Elgamouz,El Mokhtar Lemdek,Najib Tijani,Salman S Alharthi,Abdel-Nasser Kawde,Ihsan Shehadi

Journal

Membranes

Published Date

2021/12/23

Effect of AgNPs internal solution on the sensing of mercury (II) by an ion-selective electrode based on a thiol coordination from cysteine as ionophore

The use of nanoparticles in the sensing of mercury from environmental and biological fluids is limited to optical and colorimetric sensors. The present research investigates the use of starch capped silver nanoparticles (SAgNPs) as the internal solution of an ion-selective electrode (ISE) of mercury(II) using a PVC selective membrane incorporating cysteine as ionophore. SAgNPs are synthesized by the reducing method showing a 4.13 nm/diameter and a zeta potential of +33.03 ± 4.0 mV. The lattice structure of SAgNPs is identified as face-centered cubic (FCC) by using XRD analysis. HRTEM micrograph and contrast intensity profile confirms the Ag atomic lattices at 2.35 Å and 2.03 Å corresponding to (1 1 1) and (2 0 0) hkl plane. Hg2+ was sensed by the SAgNPs internal solution in the nano-molar range with a limit of detection of 0.34 nM. The potentiometric determination of Hg2+ using the ISE based on cysteine as …

Authors

Abdelaziz Elgamouz,Ihsan Shehadi,Abdelrahman Assal,Alaa Bihi,Abdel-Nasser Kawde

Journal

Journal of Electroanalytical Chemistry

Published Date

2021/8/15

Optical sensing of hydrogen peroxide using starch capped silver nanoparticles, synthesis, optimization and detection in urine

Silver nanoparticles were synthesized using starch as a capping shell, AgNO3 as a source of silver and sodium borohydride (NaBH4) as a reducing agent. The nanoparticles were confirmed by their localized surface plasmonic resonance (LSPR) Ultraviolet-visible (UV–Vis) absorbance at 403 nm. Dynamic light scattering (DLS) reveals that starch capped silver nanoparticles (SAgNPs) mean size were 4.13 nm/diameter; the structure of SAgNPs was identified as face-centered cubic (FCC) using XRD analysis. HRTEM micrograph and contrast intensity profile confirms Ag atomic lattices at a distance of 2.35 Å and 2.03 Å corresponding to (111) and (200) hkl plane. The scope of SAgNPs to detect hydrogen peroxide (H2O2) in aqueous media and in urine samples was investigated. Volumes of SAgNPs, pH, temperature and time effect were used as parameters to optimize the detection of H2O2. The SAgNPs assay was …

Authors

Abdelaziz Elgamouz,Khalid Bajou,Baraa Hafez,Chahlaa Nassab,Alaa Behi,Mohammad Abu Haija,Shashikant P Patole

Journal

Sensors and Actuators Reports

Published Date

2020/11/1

Green synthesis, characterization, antimicrobial, anti-cancer, and optimization of colorimetric sensing of hydrogen peroxide of algae extract capped silver nanoparticles

A green and cost-effective technique for the preparation of silver nanoparticles (Algae-AgNPs) as a colorimetric sensor for hydrogen peroxide (H2O2) is described. Silver nanoparticles were capped using the green algae (Noctiluca scintillans) extract at an optimum time of 3 h at 80 °C. The pH of the plant extract (pH = 7.0) yields nanoparticles with a mean size of 4.13 nm and a zeta potential of 0.200 ± 0.02 mV and negative polarity, using dynamic light scattering (DLS). High-resolution transmission electron microscopy (HRTEM) analysis showed regular spherical particles with the average size of 4.5 nm. Selected area electron diffraction (SAED) results revealed the polycrystalline nature of the silver nanoparticles. The obtained patterns were indexed as (111), (200), (220), and (311) reflections of the fcc (face centered cubic) silver crystal based on their d-spacing of 2.47, 2.13, 1.49, and 1.27 Å, respectively. The apparent color change from brown to colorless was observed when nanoparticles reacted with H2O2. Linear responses were obtained in three different ranges (nM, µM, and mM). Limits of detection (LOD) of 1.33 ± 0.02 and 1.77 ± 0.02 nM and quantitation limits (LOQ) of 7.31 ± 0.03 and 9.67 ± 0.03 nM were obtained for Abs and ΔAbs calibration curves, respectively. 10% v/v Algae-AgNPs solution inhibited Staphylococcus aureus over Escherichia coli, while a 50% reduction of tumor cell growth of MDA-MB-231 human breast adenocarcinoma was obtained.

Authors

Khalid Bajou Abdelaziz Elgamouz,Hamid Idriss,Chahlaa Nassab,Alaa Behi,Shashikant Patole Kamrul Hasan,Mohammad Abu Haija

Journal

Nanomaterials

Published Date

2020/9/17

Hydrothermal synthesis of zeolite A and Y membrane layers on clay flat disc support and their potential use in the decontamination of water polluted with toxic heavy metals

The current paper presents the fabrication of new composite ceramic porous membranes by hydrothermal deposition of zeolite A (type LTA)(m-LTA) and Y (type Faujasite)(m-FAU) on clay support. Flat-disc membrane supports were prepared by uniaxial pressure on a mixture of clay and activated carbon (3.0%, w/w). The specific surface area of Faujasite-Y deposited was found to be 558.75 m2 g–1 with an average pore diameter of 20.90 Å, while zeolite-A was presented only with a specific surface area of 6.32 m2 g–1 and an average pore diameter of 128.70 Å. The structures of pores for both zeolite layers deposited were type IV according to IUPAC which are attributed to mesoporous solids. Scanning electron microscopy revealed that the edges of the cubes vary between 1.18 and 4.37 μm for the zeolite A (m-LTA) and the average diameter ranged between 0.98 and 3.03 μm for the zeolite Y (m-FAU). m-FAU membranes were found to perform better than m-LTA membranes. The rejection order for both membranes was PbCl2> CoCl2> CdCl2> ZnCl2. For instance, a maximum rejection of 93% of ZnCl2 was attained on m-FAU membranes in 1 h and 30 min membrane operation. However, the same rejection rate for the same metal salt was attained on m-LTA after 3 h and 30 min. The mechanism of metal salt rejection was dominated by the hydrated ionic size of cations, with an exception for CoCl2 where rejection could be governed by repulsion between the charged ion and the membrane charged surface.

Authors

Adnane Lahnafi,Abdelaziz Elgamouz,Najib Tijani,Ihsan Shehadi

Journal

Desalin. Water Treat

Published Date

2020/4/1

Dataset of multiple methodology characterization of an illite-kaolinite clay mineral for the purpose of using it as ceramic membrane supports

This article describes the data generated from multiple approach methodology physico-chemical characterization of a clay mineral from the West-Central region of Morocco, Safi province (https://doi.org/10.1016/j.heliyon.2019.e02281) [1]. Data were generated from classical chemical analytical techniques namely; organic matter content, linear firing and shrinkage analysis, weight loss on ignition, porosity and methylene blue stain tests according to the French Association of Normalization (AFNOR) and American Society for Testing and Materials (ASTM). In addition to data generated using instrumental analytical techniques namely; Infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA) and deferential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and elemental energy disperse spectroscopy (EDX).

Authors

Abdelaziz Elgamouz,Najib Tijani,Ihsan Shehadi,Kamrul Hasan,Mohamad Al-Farooq Kawam

Journal

Data in brief

Published Date

2020/4/1

Dataset in the characterization of black spot Ehrenberg snapper and its proteins' denaturation inhibition by natural antioxidants

The data represented in this paper describe techniques, methodologies and data obtained during the biochemical composition characterization of Blackspot Snapper (Ehrenberg's Snapper). Data analysis of protein, lipids, moisture, ash contents of Ehrenberg's snapper, total polyphenols, total flavonoids contents and the DPPH scavenging activities of Cinnamon (Cinnamomum verum J. Presl) bark (50 mg/50 g), cumin (Cuminum cyminum L.) (50 mg/50 g), turmeric (Turmerica longa L.) (50 mg/50 g), garlic (Allium sativum L.) (50 mg/50 g), ginger (Zingiber officinale Roscoe) (50 mg/50 g) and Vitamin C (25 mg/50 g) are represented. Data obtained from the Infrared spectroscopy (FTIR) analysis of the six spices and vitamin C treated and stored fillets at −25 °C, namely three vibrations, Amide A, NH stretching at 3300 cm−1; Amide I, C=O stretching 1600−1690 cm−1 and Amide II, CN stretching and NH bending at 1480 …

Authors

Abdelaziz Elgamouz,Rana Alsaidi,Alaa Alsaidi,Mostafa Zahri,Ahmed Almehdi,Khalid Bajou

Journal

Data in brief

Published Date

2020/2/1

Abdelaziz EL GAMOUZ FAQs

What is Abdelaziz EL GAMOUZ's h-index at University of Sharjah?

The h-index of Abdelaziz EL GAMOUZ has been 12 since 2020 and 13 in total.

What are Abdelaziz EL GAMOUZ's top articles?

The articles with the titles of

Preparation and characterization of clay based ceramic porous membranes and their use for the removal of lead ions from synthetic wastewater with an insight into the removal …

Manufacturing of novel zeolite-clay composite membrane from natural clay and diatomite, an electrochemical study of the surface and application towards heavy metals removal

Polypyrrole-coated three-dimensional graphenized surface for superior supercapacitor performance

Controlled electrochemical surface exfoliation of graphite pencil electrodes for high-performance supercapacitors

β-Cyclodextrin-Functionalized Fe3O4-Supported Pd-Nanocatalyst for the Reduction of Nitroarenes in Water at Mild Conditions

Antitumor effect of algae silver nanoparticles on human triple negative breast cancer cells

Green synthesis of CuO nanoparticles using Hibiscus sabdariffa L. extract to treat wastewater in Soba Sewage Treatment Plant, Sudan

Processing and Characterization of UAE Clay Ceramic Membranes for Water Treatment Applications

...

are the top articles of Abdelaziz EL GAMOUZ at University of Sharjah.

What are Abdelaziz EL GAMOUZ's research interests?

The research interests of Abdelaziz EL GAMOUZ are: Biosensors utilizing macro-, micro- and nanomaterials for health, environmental monitoring and improved industrial process contr

What is Abdelaziz EL GAMOUZ's total number of citations?

Abdelaziz EL GAMOUZ has 675 citations in total.

What are the co-authors of Abdelaziz EL GAMOUZ?

The co-authors of Abdelaziz EL GAMOUZ are John Varcoe, Oscar Piro, Abdel-Nasser Kawde, Subrayal M Reddy, Khalid BAJOU, Kamrul Hasan, PhD.

    Co-Authors

    H-index: 59
    John Varcoe

    John Varcoe

    University of Surrey

    H-index: 42
    Oscar Piro

    Oscar Piro

    Universidad Nacional de La Plata

    H-index: 34
    Abdel-Nasser Kawde

    Abdel-Nasser Kawde

    University of Sharjah

    H-index: 31
    Subrayal M Reddy

    Subrayal M Reddy

    University of Central Lancashire

    H-index: 27
    Khalid BAJOU

    Khalid BAJOU

    University of Sharjah

    H-index: 18
    Kamrul Hasan, PhD

    Kamrul Hasan, PhD

    University of Sharjah

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