Browsing by Author "Abdel-Mottaleb, M. M"

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    High performance of PAN/GO-ZnO composite nanofibers for photocatalytic degradation under visible irradiation
    (ELSEVIER SCIENCE BV, 2019-08) Khattab, A; Osman, T. A.; Karim, Shrouk; Khalil, Alaa; Abdel-Mottaleb, M. M
    In this work, Polyacrylonitrile nanofibers were enhanced by graphene oxide and zinc oxide, in terms of enhanced the photocatalytic activity and mechanical properties for the composite nanofibers. Photocatalytic degradation of two organic dyes methylene blue dye and indigo carmine dye from the simulated industrial wastewaters has been investigated under visible light irradiation. Composite nanofibers fabricated by using electrospinning technique followed by chemical cross-linking with zinc oxide. The surface sensitization and morphology changes of the fabricated composite nanofibers were studied using Fourier transform infrared spectroscopy analysis, Scanning Electron Microscopy and transmission electron microscope. Sensitized zinc oxide with graphene oxide showed higher efficiency in the degradation of MB with a 96% of degradation efficiency after 70 min and 98% for IC after merely 27 min. The optimum catalytic parameters such as initial organic dye concentration and pH were discussed. The efficacy of degradation of methylene blue dye and indigo carmine increased as initial concentration decreased. The optimal pH was around 5 where the reaction rate decreases above and under this pH value.
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    Visible light photocatalytic activity of PAN-CNTs/ZnO-NH2 electrospun nanofibers
    (ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND, 1/25/2019) Karim, Shrouk A; Mohamed, Alaa; Abdel-Mottaleb, M. M; Osman, T. A; Khattab, A.
    The water pollution increases every day due to the increase of the humans needs so a lot of studies were studied for looking the solutions. In this work, we studied the photocatalytic degradation performance of the methylene blue (MB) and the indigo carmine (IC) in an aqueous solution by using the composite nanofiber (PAN-CNTs/ZnO-NH2) under visible light. The electrospinning technique was used to fabricate the PAN-CNTs followed by a chemical crosslinking of ZnO nanoparticles (NPs) on it. FTIR, TEM, SEM and XRD analysis are used to examine the changes of the surface morphology, structure and modification of the fabricated composite nanofiber. This study has proved that PAN-CNTs/ZnO-NH2 get high photodegradation efficiency at a low power intensity (80 lux) and at a short time. A complete degradation has done for the dyes solution after a very short time 29 min and 115 min for IC and MB respectively. There are many factors taking into account during the photodegradation process like the pH of the solution, dyes concentration and the irradiation time. (C) 2018 Elsevier B.V. All rights reserved.