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Shokry Hassan H.,Advanced Technology and New Materials Researches Institute | Elkady M.F.,Alexandria University | Elkady M.F.,Advanced Technology and New Materials Research Institute ATNMRI | El-Shazly A.H.,Alexandria University | Bamufleh H.S.,King Abdulaziz University
Journal of Nanomaterials | Year: 2014

The sol-gel prepared zinc oxide nanopowder was immobilized onto alginate-polyvinyl alcohol polymer blend to fabricate novel biocomposite beads. Various physicochemical characterization techniques have been utilized to identify the crystalline, morphological, and chemical structures of both the fabricated zinc oxide hybrid beads and their corresponding zinc oxide nanopowder. The thermal stability investigations demonstrate that ZnO nanopowder stability dramatically decreased with its immobilization into the polymeric alginate and PVA matrix. The formulated beads had very strong mechanical strength and they are difficult to be broken up to 1500 rpm. Moreover, these hybrid beads are chemically stable at the acidic media (pH < 7) especially within the pH range of 2-7. Finally, the applicability of the formulated ZnO hybrid beads for C.I. basic blue 41 (BB41) decolorization from aqueous solution was examined. © 2014 H. Shokry Hassan et al. Source


Elkady M.F.,Advanced Technology and New Materials Research Institute ATNMRI | Elkady M.F.,Alexandria University | Shokry Hassan H.,Advanced Technology and New Materials Researches Institute | El-Sayed E.M.,Advanced Technology and New Materials Research Institute ATNMRI
Journal of Chemistry | Year: 2015

As an innovative cation exchange material, nanozirconium tungestovanadate prepared using homogeneous precipitation technique was immobilized into alginate matrix and evaluated for cationic dye decolourization. Physicochemical properties of the prepared composite material were examined to determine its crystallinity, morphology, and ion exchange capacity. The SEM and TEM images of the prepared zirconium tungestovanadate identified that it was prepared in homogeneous structure with spherical shape in average diameter 22 nm. However, the optical microscope image of the composite matrix confirms the good distribution of nanozirconium tungestovanadate into the polymeric matrix. Batch technique was utilized to test the cation exchange efficiency of the prepared composite material toward C.I. basic violet 16 dye decolourization. The optimum immobilized dosage from nanozirconium tungestovanadate into the polymeric matrix to achieve 99% dye decolourization from 50 ppm initial dye concentration was recorded as 8 g/L. The dye sorption process onto the prepared material is described as an endothermic process. The dye sorption process at equilibrium was following both Langmuir and Freundlich isotherm models. The kinetic sorption behaviour of dye onto the composite matrix is correlated to pseudo-second-order equation model. Copyright © 2015 M. F. Elkady et al. Source


El-Aassar M.R.,Donghua University | El-Aassar M.R.,Advanced Technology and New Materials Researches Institute | El-Kady M.F.,Alexandria University | El-Kady M.F.,Advanced Technology and New Materials Researches Institute | And 2 more authors.
Journal of the Taiwan Institute of Chemical Engineers | Year: 2016

In the present work, poly acrylonitrile-co-styrene (poly (AN-co-ST)) copolymer was prepared using solution polymerization. The synthesized copolymer was fabricated into nanofiber using electrospinning technique with an average diameter of approximately 220 nm, were successfully synthesized. This nanofiber was functionalized with surface carboxylic acid groups. Characterization of the poly (AN-co-ST) nanofiber and its modified nanofibers were studied by SEM, FTIR, and TGA, and the chemical modification process has positive effect on the mechanical properties of the produced nanofiber as elucidated from the tensile stress-strain test. The chemically modified copolymer nanofiber (CMCN) was evaluated for decolorization of C.I. Basic violet 14 from aqueous solutions. The decolorization process onto the nanofiber was relatively fast and the equilibrium was achieved within 30 min. The influence of the different parameters affecting the dye sorption process was established. The increment on both the pH and the temperature of the dye solution enhance the dye sorption onto the prepared chemically modified nanofiber. Meanwhile, the presence of cation salts accompanying the dye ions hinders the dye sorption process onto the prepared nanofiber. The chemically modified nanofiber proved its effectiveness as adsorbent material for dye decontamination from the polluted wastewater. © 2015 Taiwan Institute of Chemical Engineers. Source


Elkady M.F.,Alexandria University | Elkady M.F.,Advanced Technology and New Materials Research Institute ATNMRI | Hassan H.S.,Advanced Technology and New Materials Researches Institute
Current Nanoscience | Year: 2015

In spite of zinc oxide nanoparticles proved good adsorbent for dyes, however, its agglomeration tendency in aqueous media, that corresponding to its hydrophobic nature declines its efficiency. Consequently, the prepared zinc oxide nanoparticles were encapsulated onto a polymer blend of alginate and polyvinyl alcohol to be formulated into bio-beads of zinc oxide. The produced bio-beads were characterized using SEM and XRD. The feasibility of the formulated bio-composite beads for C.I basic blue 41 (CB41) decolorization from aqueous solution was evaluated using batch technique. The experimental results at equilibrium were analyzed using different isotherm models to evaluate the equilibrium adsorption behavior of CB41 onto the prepared materials. It was indicated that, the equilibrium sorption data was fitted well by Freundlich, and Dubinin-Radushkevich isotherms compared to Langmuir and Temkin isotherms. Kinetic profile of the dye sorption process evident from the film diffusion of dyes on to hybrid beads controls the rate of process. © 2015 Bentham Science Publishers. Source


Shokry Hassan H.,Advanced Technology and New Materials Researches Institute | Kashyout A.B.,Advanced Technology and New Materials Researches Institute | Morsi I.,Arab Academy for Science and Technology | Nasser A.A.A.,Arab Academy for Science and Technology | Raafat A.,Arab Academy for Science and Technology
Sensing and Bio-Sensing Research | Year: 2014

A novel structures of nanomaterials gas sensors array constructed using ZnO, and ZnO doped with Al via sol-gel technique. Two structure arrays are developed; the first one is a double sensor array based on doping with percentages of 1% and 5%. The second is a quadrature sensor array based on several doping ratios concentrations (0%, 1%, 5% and 10%). The morphological structures of prepared ZnO were revealed using scanning electron microscope (SEM). X-ray diffraction (XRD) patterns reveal a highly crystallized wurtzite structure and used for identifying phase structure and chemical state of both ZnO and ZnO doped with Al under different preparation conditions and different doping ratios. Chemical composition of Al-doped ZnO nanopowders was performed using energy dispersive X-ray (EDS) analysis. The electrical characteristics of the sensor are determined by measuring the two terminal sensor's output resistance for O2, H2 and CO2 gases as a function of temperature. © 2014 Elsevier Ltd. Source

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