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RISS 인기검색어
- 검색키워드
- 저자 : Salah M. El-kousy (검색결과 3 건)
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Hadeel G. El-Shorbagy,Salah M. El-kousy,Khalid Z. Elwakeel,M.A. Abd El-Ghaffar 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.100 No.-
A simple and economical method for modifying chitosan based on non-catalytic direct condensationreaction between chitosan and phenolic acids “Gallic and Caffeic acids” has been developed to producecondensation adduct resins RI and RII. The resins structure and morphology were confirmed by physicaland chemical tools such as FTIR, SEM, EDX, XRD elemental analysis, TGA, water regain, dissociation inacidic medium, and point of zero charge. The new resins were evaluated as silver ions adsorbents. Factorsaffecting adsorption, as well as kinetics, equilibrium, and thermal properties of adsorption, were studiedusing conventional equations. The new resins showed more efficient removal of toxic silver ions from theaqueous medium than parent chitosan polymer. The maximum adsorption capacity amounted to 67.5,300, and 278 mg/g with removal efficiency reaching 22.5%, 100%, and 92.66% for chitosan, RI, and RII;respectively at pH 6.5 and initial silver concentration 300 mg/L. The new resins showed spontaneouschemisorption toward silver ions with exothermic nature for RI, and endothermic nature for RII. The newcondensation adduct resins showed good re-use ability reaching 83% and 67% for RI and RII; respectively,by using 0.01 M nitric acid solution.
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Ziziphus spina-christi based bio-synthesis of Ag nanoparticles
Mervat F. Zayed,Wael H. Eisa,Yasser K. Abdel-Moneam,Salah M. El-kousy,Ahmed Atia 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
The bio-production of silver nanoparticles (Ag NPs) using Ziziphus spina-christi extract was studied as a novel, rapid, low-cost and eco-friendly route. The impact of experimental factors, such as the extract quantity, precursor concentration and pH on the size and size distribution of Ag NPs, was studied with the aid of UV–vis spectrophotometer and transmission electron microscope (TEM). The FTIR analysis was carried out to identify the functional groups in Ag NPs. The as-synthesized Ag NPs was used as a catalyst for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of NaBH4.
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Ahmed Atia,Yasser K. Abdel-Monem,A.H. Salama,Salah M. El-kousy,Wael H. Eisa 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
A clean and high-throughput synthesis of gold@chitosan nanocomposite using nontoxic oxalic acid as areducing agent was developed. The synthetic route was carried out in completely dry conditions, i.e. solid-state reaction. The gold nanoparticles were bound with chitosan through the hydroxyl and aminogroups, as confirmed by Fourier transform infrared spectroscopic analysis. Scanning and transmissionelectron microscopy imaging confirmed the formation of semi-spherical gold particles with an averagesize of 8–15 nm. The catalytic performance of the synthesized gold nanoparticles for the reduction ofchromium(IV) in the presence of formic acid was evaluated. The film-forming ability of chitosan enabledthe design of separable/reusable heterogeneous catalyst which is convenient for real industrial applications. The proposed solid-state synthetic route could be adapted to produce a wide variety of nanostructuredmaterials that are characterized by high-yield, greenness, and low cost in very simple steps.
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