- Egypt
abdelaziz aboraia
Al-Azhar University, PHYSICAL EDUCATION, Faculty Member
- I am assistant lecturer at physics department, at the physics department, faculty of science Al-Azhar university Assi... moreI am assistant lecturer at physics department, at the physics department, faculty of science Al-Azhar university Assiut branch Egypt. I'm interested in material science preparation nanomaterial and characterization by different techniques such as (XRD-XAS- Synchrotron- Spectrophotometer)edit
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Zeolitic imidazolate frameworks (ZIFs) are interesting materials for use in several aspects: energy storage material, gas sensing, and photocatalysis. The thermal stability and pyrolysis process are crucial to determine the active phase... more
Zeolitic imidazolate frameworks (ZIFs) are interesting materials for use in several aspects: energy storage material, gas sensing, and photocatalysis. The thermal stability and pyrolysis process are crucial to determine the active phase of the material. A deep understanding of the pyrolysis mechanism is in demand. So, the thermodynamics and combustion process with different heating rates were examined, and the kinetic parameters were computed employing thermogravimetric tests. Based on the TG analysis of combustion, pyrolysis moves to the high-temperature region with an increase in heating rate. The decomposition process can be separated into dehydration (300–503 K) and pyrolysis reaction (703–1100 K). Three points of the decomposition process are performed by dynamical analysis owing to shifts of slopes, but the combustion process has only one stage. Dynamical parameters, for instance, the possible mechanism, the pre-exponential factor, and the apparent activation energy were obtained through comparison using the Kissinger formula. The thermodynamics analysis of the Zn1−xCox ZIF-8 materials is an effective way to explore the temperature influence on the process of pyrolysis, which can benefit in several recent applications.
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Zeolitic imidazolate frameworks (ZIFs) are interesting materials for use in several aspects: energy storage material, gas sensing, and photocatalysis. The thermal stability and pyrolysis process are crucial to determine the active phase... more
Zeolitic imidazolate frameworks (ZIFs) are interesting materials for use in several aspects: energy storage material, gas sensing, and photocatalysis. The thermal stability and pyrolysis process are crucial to determine the active phase of the material. A deep understanding of the pyrolysis mechanism is in demand. So, the thermodynamics and combustion process with different heating rates were examined, and the kinetic parameters were computed employing thermogravimetric tests. Based on the TG analysis of combustion, pyrolysis moves to the high-temperature region with an increase in heating rate. The decomposition process can be separated into dehydration (300–503 K) and pyrolysis reaction (703–1100 K). Three points of the decomposition process are performed by dynamical analysis owing to shifts of slopes, but the combustion process has only one stage. Dynamical parameters, for instance, the possible mechanism, the pre-exponential factor, and the apparent activation energy were obtained through comparison using the Kissinger formula. The thermodynamics analysis of the Zn1−xCox ZIF-8 materials is an effective way to explore the temperature influence on the process of pyrolysis, which can benefit in several recent applications.
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Molybdenum disulfide (MoS2) has recently been considered as an effective material for potential photocatalytic applications; however, its photocatalytic activity was limited due to the low density of active sites. In this work, MoS2... more
Molybdenum disulfide (MoS2) has recently been considered as an effective material for potential photocatalytic applications; however, its photocatalytic activity was limited due to the low density of active sites. In this work, MoS2 Quantum dots (QDs) were synthesized via the ultrasonication technique to construct heterostructure with SnS2 nanosheets (SnS2@MoS2 QDs) and the prepared materials were tested for photocatalytic applications for Methylene blue (MB). Pristine SnS2 and SnS2@MoS2 QDs nanocomposite were analyzed by XRD, TEM, PL, and Uv-Vis. Both SnS2 and SnS2@MoS2 QDs exhibited a single trigonal phase with the P-3m1 space group. The TEM analysis confirmed the coupling between the pristine SnS2 and SnS2@MoS2 QDs. The results of photocatalytic activity toward MB indicated that SnS2@MoS2 QDs material exhibits much superior photocatalytic performance compared to pristine SnS2. The excellent photodegradation performance of SnS2@MoS2 QDs is due in the main to the formation of heterojunction between SnS2 and MoS2 QDs with narrow bandgap formation, which results in a facile carriers transfer and thus high photocatalytic efficiency. A representative mechanism of the photodegradation for SnS2@MoS2 QDs photocatalyst was proposed. Such an ultrasonic technique is capable of producing small metallic particle size that can be used to construct new heterostructures for water remediation applications.
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Molybdenum disulfide (MoS2) has recently been considered as an effective material for potential photocatalytic applications; however, its photocatalytic activity was limited due to the low density of active sites. In this work, MoS2... more
Molybdenum disulfide (MoS2) has recently been considered as an effective material for potential photocatalytic applications; however, its photocatalytic activity was limited due to the low density of active sites. In this work, MoS2 Quantum dots (QDs) were synthesized via the ultrasonication technique to construct heterostructure with SnS2 nanosheets (SnS2@MoS2 QDs) and the prepared materials were tested for photocatalytic applications for Methylene blue (MB). Pristine SnS2 and SnS2@MoS2 QDs nanocomposite were analyzed by XRD, TEM, PL, and Uv-Vis. Both SnS2 and SnS2@MoS2 QDs exhibited a single trigonal phase with the P-3m1 space group. The TEM analysis confirmed the coupling between the pristine SnS2 and SnS2@MoS2 QDs. The results of photocatalytic activity toward MB indicated that SnS2@MoS2 QDs material exhibits much superior photocatalytic performance compared to pristine SnS2. The excellent photodegradation performance of SnS2@MoS2 QDs is due in the main to the formation of heterojunction between SnS2 and MoS2 QDs with narrow bandgap formation, which results in a facile carriers transfer and thus high photocatalytic efficiency. A representative mechanism of the photodegradation for SnS2@MoS2 QDs photocatalyst was proposed. Such an ultrasonic technique is capable of producing small metallic particle size that can be used to construct new heterostructures for water remediation applications.
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Abstract Zeolitic imidazolate frameworks (ZIF-8) thin films were fabricated via layer by a layer deposition method. The investigation of X-ray diffraction (XRD) of the ZIF-8 powder form was seen to be polycrystalline with a single... more
Abstract Zeolitic imidazolate frameworks (ZIF-8) thin films were fabricated via layer by a layer deposition method. The investigation of X-ray diffraction (XRD) of the ZIF-8 powder form was seen to be polycrystalline with a single cubic-phase structure. The lattice parameters and Miller index were calculated using Rietveld refinement by Fullprof software. XRD of ZIF-8 film demonstrates an amorphous structure. The morphology of the ZIF-8 films has therefore been studied with the scanning laser microscope method and found that the homogeneity and surface enhance with increasing the film thickness. On the other hand, it is found that ZIF-8 films have a direct electronic transition with two energy bandgaps (3.62 and 4.58 eV) and their values independent of the thickness of the films. The optical constants were calculated, and the refractive index esteems increment with expanding of the film thickness. This outcome might be credited to the interlude of the film in the preliminary phase of the deposition. The nonlinear optical constants for ZIF-8 film were calculated, and the third-order optical nonlinearity was expanded with expanding the film thickness.
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Abstract Zeolitic imidazolate frameworks (ZIF-8) thin films were fabricated via layer by a layer deposition method. The investigation of X-ray diffraction (XRD) of the ZIF-8 powder form was seen to be polycrystalline with a single... more
Abstract Zeolitic imidazolate frameworks (ZIF-8) thin films were fabricated via layer by a layer deposition method. The investigation of X-ray diffraction (XRD) of the ZIF-8 powder form was seen to be polycrystalline with a single cubic-phase structure. The lattice parameters and Miller index were calculated using Rietveld refinement by Fullprof software. XRD of ZIF-8 film demonstrates an amorphous structure. The morphology of the ZIF-8 films has therefore been studied with the scanning laser microscope method and found that the homogeneity and surface enhance with increasing the film thickness. On the other hand, it is found that ZIF-8 films have a direct electronic transition with two energy bandgaps (3.62 and 4.58 eV) and their values independent of the thickness of the films. The optical constants were calculated, and the refractive index esteems increment with expanding of the film thickness. This outcome might be credited to the interlude of the film in the preliminary phase of the deposition. The nonlinear optical constants for ZIF-8 film were calculated, and the third-order optical nonlinearity was expanded with expanding the film thickness.
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Abstract Constructing excellent heterojunction to improve the photocatalytic performance of materials is critically important. Herein, we report an effective simple, easy preparation method for α-Fe2O3@MoS2QDs nanocomposite via two... more
Abstract Constructing excellent heterojunction to improve the photocatalytic performance of materials is critically important. Herein, we report an effective simple, easy preparation method for α-Fe2O3@MoS2QDs nanocomposite via two two-step process, including hydrothermal and ultrasonication approaches. The as-prepared materials were characterized using X-ray diffraction (XRD), Transmission electron microscope (TEM), TGA, X-ray fluorescence (XRF) and photoluminescence spectra (PL). The refined PXRD patterns of α-Fe2O3 photocatalyst confirm the formation of a single trigonal phase of Fe2O3 without another phase impurities. When the MoS2 QDs were coupled with α-Fe2O3, the phase was changed to a single monoclinic phase with C 2/C space group and no peaks observed for MoS2 QDs. Morphological analyses reveal the successful formation of Fe2O3@MoS2QDs nanocomposites with uniform distribution of MoS2 QDs on the Fe2O3 surface. The XRF analysis confirmed the presence of Mo, S, and Fe elements indicating the nanocomposite formation. The Uv–vis results revealed the enhancement of absorption capability of the α-Fe2O3@MoS2QDs material, particularly in the white light region. Very noticeably, the as-prepared α-Fe2O3@MoS2QDs exhibit high photocatalytic activity performance (84%) toward methylene blue (MB) in 1 min under visible light irradiation. The superior photocatalytic performance of the prepared material can be attributed to the enhancement of the light absorption and the high separation efficiency of photogenerated electron-hole pair in Fe2O3@MoS2QDs structure, which confirmed by PL analysis. The mechanism of photocatalytic degradation of MB over Fe2O3@MoS2QDs nanocomposite was suggested. This work provides a new, low-cost and straightforward idea for enhancement of the degradation performance of organic pollutants in water.
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Research Interests: Chemistry, Inorganic Chemistry, Adsorption, Iodine, Elsevier, and 3 moreMolecule, Triethylamine, and Bromine
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Abstract Zinc telluride (ZnTe) and zinc sulfide (ZnS) thin films were deposited onto glass substrates by the thermal evaporation technique. Their structural characteristics were studied by X-ray diffraction (XRD). XRD showed that both... more
Abstract Zinc telluride (ZnTe) and zinc sulfide (ZnS) thin films were deposited onto glass substrates by the thermal evaporation technique. Their structural characteristics were studied by X-ray diffraction (XRD). XRD showed that both ZnTe and ZnS films are polycrystalline with a zinc blende (cubic) structure. The optical constants ( n , k ), and film thickness ( d ) of ZnTe and ZnS thin films were obtained using two methods, first was based on transmission ( T ) curve obtained by spectrophotometer (SM), using envelope method suggested by Swanepoel and the second was dependent on the ellipsometric parameters ( ψ and Δ) obtained by spectroscopic ellipsometry (SE), using three layer model systems. Both the film thickness and refractive index obtained through these two methods are comparable. The optical band gap was calculated in terms of SE in strong absorption region. The possible optical transition in these films is found to be allowed direct transitions. The increase of E g o p t for both ZnTe and ZnS thin films may be the contributing factor in the increase of crystallites size and decrease in lattice strain.
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Dyes are commonly used in industry, but disposing of them after use is a serious issue as many toxic dyes end up in wastewater. Our paper aims to address this problem by utilizing Zn100−xSmxO (where x = 0, 2.5, 5, and 10) nanoparticles as... more
Dyes are commonly used in industry, but disposing of them after use is a serious issue as many toxic dyes end up in wastewater. Our paper aims to address this problem by utilizing Zn100−xSmxO (where x = 0, 2.5, 5, and 10) nanoparticles as a cost-effective and easily produced photocatalyst to break down common industrial dyes such as Methylene blue (MB), Rhodamine B (RhB), and a mixture of both. We characterized the nanoparticles using various techniques such as x-ray diffraction, Fourier-transform infrared spectroscopy, x-ray Photoelectron Spectroscopy, and Transmission electron microscope. Our analysis confirmed that the Zn100−xSmxO nanoparticles have a single hexagonal phase and a regular shape, with a size of 50 nm. We found that the doping ratio of our fabricated material affects its absorption and energy gap, with Eg decreasing from 2.95 to 2.78 eV as the doping ratio increased. We evaluated the photocatalytic activity of the nanoparticles for the three types of dyes and found that Zn95Sm5O had an efficiency of approximately 80%. Zn95Sm5O was also able to adsorb 68% RhB and 67% MB in the MB-RhB mixture solution. Furthermore, we determined that the degradation of both dyes followed a pseudo-first-order reaction process.
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Environmental and health issues are critical challenges for sustainable development in the 21st century; therefore, this paper investigates a simple and cost-effective process for recovery of organic matter (OM) from phosphoric acid to... more
Environmental and health issues are critical challenges for sustainable development in the 21st century; therefore, this paper investigates a simple and cost-effective process for recovery of organic matter (OM) from phosphoric acid to provide environmentally acceptable P-fertilizer. This study analyzed the structural transformations and adsorption properties of Na-bentonite clay before and after chemical activation by sulfuric and hydrochloric acids. The untreated and treated clay samples have been used for adsorption of organic matter from high strength phosphoric acid. The experimental data exhibited that the clay treated with sulfuric acid caused highest organic matter adsorption capacity. The kinetic models of adsorption were analyzed by the pseudo-first order, pseudo-second order, Elovich kinetic and Morris-Weber models. The results indicated that the pseudo-second-order kinetic model is more appropriate than the others for natural bentonite; but, for chemical activated clays, pseudo-first order is fitting. Obtained adsorption thermodynamic parameters (ΔH°, ΔS°, and ΔG°) expose that the organic matter adsorption is an endothermic, physical, and spontaneous process.
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LiCoPO4 was synthesized in a short time by a microwave-assisted solvothermal technique at 220°C. The as-prepared samples are characterized as belonging to the Pn21a symmetry group, having poor electrochemical performance, and low specific... more
LiCoPO4 was synthesized in a short time by a microwave-assisted solvothermal technique at 220°C. The as-prepared samples are characterized as belonging to the Pn21a symmetry group, having poor electrochemical performance, and low specific capacity around 30 mAh/g. Further, activation at 700°C under air and argon increased the specific capacity to 57 mAh/g and 55 mAh/g, respectively. The local atomic and electronic structure of the samples before and after annealing was studied using x-ray absorption spectroscopy (XAS). The activation under air and Ar led to a phase transition from the Pn21a space group to the Pnma space group without changes in the Co oxidation state. Therefore, using myristic acid as a source for carbon coating, we found that there were no specific requirements for the activation atmosphere.
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Abstract We report the results of the application of UiO-66 derivates for dye removal. This complex process includes two parallel mechanisms. The first one is the adsorption of the dye into the pores of MOF. The second one is... more
Abstract We report the results of the application of UiO-66 derivates for dye removal. This complex process includes two parallel mechanisms. The first one is the adsorption of the dye into the pores of MOF. The second one is photocatalytic degradation. We used two linkers for MOF synthesis: 1,4-benzene dicarboxylate and 1,4-naphthalene dicarboxylate. The introduction of these molecules in various ratios into the UiO-66-type structure allowed us to trace the effect of naphthalene species on the methylene blue removal. It was shown that a conjugated π-system of naphthalene rings led to charge transfer from linker to zirconium ions. It reduces the bandgap of the material and, therefore, results in higher photocatalytic performance. We also traced the effect of defects in the MOF structure on methylene blue degradation. It was shown that unsaturated zirconium ions in defect pores effectively catalyze dye cleavage and direct this process to the oxidative demethylation pathway. Obtained results could be applied to improve the photocatalytic properties of UiO-66 derivates.
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The conventional technique has been used to prepare a quaternary glass based on the chemical composition 5Al2O3- $$(10+x)$$ Li2O- $$(70 - x)$$ B2O3-15TiO2 $$:(0\le x\le 25)$$ mol.%. The Fourier transform infrared spectrometer spectra were... more
The conventional technique has been used to prepare a quaternary glass based on the chemical composition 5Al2O3- $$(10+x)$$ Li2O- $$(70 - x)$$ B2O3-15TiO2 $$:(0\le x\le 25)$$ mol.%. The Fourier transform infrared spectrometer spectra were investigated for the structural change of these glasses. Ultraviolet spectroscopic at ambient temperature of the investigated glass system. The optical bandgap and refractive index of these glasses were decreased, while Urbach energy was increased. The polarizability and basicity of these glasses have been established. To demonstrate the influence of titanium oxide on dispersion parameters, these glasses were applied. Under controlled heating, the glass–ceramic was prepared and investigated using X-ray diffraction and mechanical characteristic. Glass–ceramic surface morphology has been examined by scanning electron microscope.
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A zeolitic imidazolate framework-8 (ZIF-8) electrode is a good candidate as an anode material.
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This research presents a novel optical polymer of polyvinyl alcohol (PVA), as a host matrix, doped with various weight concentrations of Neodymium oxides (Nd2O3) metals, as a filler, where Nd2O3/PVA polymeric thin films were synthesized... more
This research presents a novel optical polymer of polyvinyl alcohol (PVA), as a host matrix, doped with various weight concentrations of Neodymium oxides (Nd2O3) metals, as a filler, where Nd2O3/PVA polymeric thin films were synthesized to be successfully utilized as a dynamic media for polymeric lasers. The solution casting method, simple and low-cost, was applied to homogeneously prepared composite films of Nd2O3-doped PVA. The crystallinity of the structures, the uniformity of the films, and the interactions among the Nd2O3 doping metals and the PVA matrix were approved via x-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis. The remarkable effects of various weight concentrations of Nd2O3 doping on the optical parameters for Nd2O3/PVA composite polymeric thin films were determined using a UV–vis spectrophotometer. Kramers-Kroning’s approach was exploited to evaluate the linear refractive index (n), energy bandgap (E g ), and nonlinear optical effects for the proposed polymers. Moreover, a manual Z-scan method was applied to study the optical limiting effects using red He-Ne laser and green diode laser. This study illustrated some advantages of the outcome of the semi-crystalline structure, amazing linear optical parameters, including low optical energy bandgaps, brilliant dielectric constant, substantial optical limiting, as well as excellent nonlinear optical parameters of the proposed Nd2O3/PVA nanocomposite films. Thus, it is possible to conclude that the synthesized Nd2O3/PVA polymeric films play central roles in different promising, practical optoelectronic applications, such as lasers, optical filters, optical communication, light-emitting diodes, and optical switching.