Browsing by Author "Nabih, Shimaa"

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    Photocatalytic performance of TiO2@SiO2 nanocomposites for the treatment of different organic dyes
    (SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS, 2019-05) Nabih, Shimaa; Shalan, Ahmed Esmail; Abu Serea, Esraa Samy; Goda, Mona A.; Sanad, Mohamed Fathi
    Photocatalytic degradation of pollutant using TiO2@SiO2 nanocomposites (NCs) is a well route for the treatment of the organic waste in aquatic life. The recent work focuses on the removal of many organic dyes like methylene blue, eosin and safranin and study the pollutant degradation of them using the activity and high efficiency of titania as well as nanostructured titania@silica. The impregnation of silica with anatase-type TiO2 was carried out through a sol-gel way. The obtained powders were checked and characterized using N-2 adsorption-desorption complete isotherm at low temperature, BET, FESEM, XRD, PL, UV-Vis spectroscopy, diffuse reflectance spectra and the photocatalytic activity to attain the homogeneity distribution of the nanostructure particles inside the matrix. TiO2@SiO2 material displayed good photocatalytic properties compared to a pure titania. Different parameters as the type of the photocatalyst, pH of solution, amount of the photocatalyst and adsorption were studied. In addition, reusability for dye removal under consecutive cycles was also investigated. Photocatalytic activity and the excellent properties of the TiO2@SiO2 NCs displayed that these materials can consider being good candidate considered in water treatment applications.
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    Synthesis and Characterization of Silver/Zein Nanocomposites and Their Application
    (WILEY, 2017) Ghazy, Omayma; Nabih, Shimaa; Abdel-Moneam, Yasser
    Zein nanoparticles were prepared by the liquid-liquid dispersion method. The particles were used as templates for growing silver nanoparticles by reduction of silver ions using gamma radiation. The dynamic light scattering and transmission electron microscopy (TEM) results indicated that the obtained zein nanoparticles have spherical shape with a homogeneous particle size distribution and an average particle size of 60 nm. The factors affecting the silver nanoparticle deposition on zein nanoparticles were studied. Among these factors, irradiation dose, silver ion concentration, and zein polymer content were evaluated. The formation of the nanocomposite was detected using UV-vis spectroscopy and TEM. The surface plasmon resonance peak was found to be sensitive to the concentration of the zein and AgNO3 solutions. A blue shift was observed as the zein content was increased, while a red shift took place upon increasing the AgNO3 concentration. The TEM imaging indicated that the silver particles are nanosized, spherical in shape and adsorbed on the surface of zein particles. The Zein/silver nancomposites were applied for the antimicrobial test against E. coli and found to have high antibacterial activity. (C) 2015 Society of Plastics Engineers