Publications by authors named "Shawky M Hassan"
X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to investigate the structural, surface and particles properties of a series of zinc oxides (ZnO) doped with polyvinyl alcohol (PVA) that were prepared using the sol-gel method. The results demonstrated that the crystallinity of the catalysts decreased as the PVA content increased beyond 5 PVA/ZnO. However, on raising the calcination temperature up to 500 °C, the average crystal size of the PVA/ZnO nanoparticles increased.
View Article and Find Full Text PDFMono-(Fe) and bimetallic Co-Fe-MOF with different Co and Fe contents was successfully synthesized by the solvothermal method. The structural properties of the prepared samples were characterized by X-ray diffraction, transmission electron microscopy (TEM), Brunauer-Emmett-Teller specific surface area, and Fourier transform infrared spectroscopy. The results revealed the successful formation of mono and mixed Co-Fe-MOF.
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- Researchers created ZnO and ZnO/poly(vinyl alcohol) (PVA) catalysts using the sol-gel method and confirmed their structure with X-ray diffraction, revealing spherical nanoparticles via scanning electron microscopy.
- The catalysts were tested for their ability to decompose dyes methylene blue (MB) and methyl orange (MO) under UV-visible light, with ZnO/5PVA being the best for MB and ZnO/7PVA for MO.
- Additionally, the biological activity study showed that ZnO/5PVA effectively reduced glucose levels in diabetic rats, highlighting its potential medical application.
Article Synopsis
- A bimetallic Cr-Mg-MOF was successfully created using a solvothermal method and modified with varying amounts of phosphomolybdic acid (PMA) through wet impregnation.
- The study revealed that doping with magnesium increased the surface area and enhanced the adsorption performance of the Cr-Mg-MOF compared to other metal-organic frameworks (MOFs).
- Catalytic tests showed that PMA-loaded Cr-Mg-MOFs exhibited peak catalytic activity at 75 wt%, making them promising candidates for environmentally friendly acid-catalyzed organic reactions.
The 4-hydroxysalicylidenechitosan Schiff-base (2CS-Hdhba) was prepared by the condensation of 2,4-dihydroxybenzaldehyde with chitosan, and its metal complexes, [M(2CS-dhba)Cl(2)(H(2)O)(2)] (M(III)=Fe, Ru, Rh), [M'(2CS-dhba)(AcO)(H(2)O)(2)] (M'(II)=Co, Ni, Cu, Zn), [Pd(2CS-dhba)Cl(H(2)O)] and [Au(2CS-dhba)Cl(2)], are reported. These complexes were characterized by elemental analysis, by spectral data (FTIR, solid-phase (13)C NMR, UV-vis and ESR spectroscopy), by morphological observations (SEM and XRD), and by magnetic and thermal measurements. The Schiff base (2CS-Hdhba) behaves as a bidentate chelate with a single negative charge.
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