Abstract
TiO2/ZnO nanocomposites were prepared by the sol-gel method with and without addatives such as carboxy methyl cellulose (CMC), poly(ethylene glycol) (PEG), polyvinylpyrrolidon, (PVP), and hydroxylpropylcellulose (HPC). The characteristics of the prepared TiO2/ZnO nanocomposites were identified by IR spectra, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS) methods. The additives have a significant effect on the particle size distribution and photocatalytic activity of TiO2/ZnO nanocomposites. The photocatalytic activity of the synthesized nanocomposites was investigated for decolorization of methyl orange (MO) in water under UV-irradiation in a batch reactor and the results showed that the photocatalytic activity of the nanocomposites have been increased by CMC, PEG, PVP, and HPC, respectively. SEM has shown that the particle size distribution of TiO2/ZnO nanocomposite in the presence of HPC was better than the other samples.
Highlights
Azo dyes constitute the largest group of coloring materials in the textile industry [1,2,3]
The chemicals used in this study were Tetra isopropyl orthotitanate (TTIP), zinc nitrate tetrahydrate, diethanolamine (DEA), Glacial acetic acid, methyl orange (MO), absolute ethanol, deionized water from Merck Chemical Company, and carboxymethyl cellulose (CMC), poly(ethylene glycol) (PEG), poly vinyl pyrrolidone (PVP), and hydroxylpropyl cellulose (HPC) from Sigma-Aldrich Company
The peak around 1450 cm−1 was ascribed to the vibration mode of Ti-O and Ti-O-C that the Ti-O-C may result from the interaction between the Ti–O network and ZnKaZnkb 2 4 6 8 10 12 14 16 (a)
Summary
Azo dyes constitute the largest group of coloring materials in the textile industry [1,2,3]. Release of these substances in nature is the largest source of pollution for natural ecosystems. Several methods on the preparation of TiO2/ZnO were reported, such as solid-state method, impregnation method, and chemical coprecipitation method [7,8,9] Another method is the sol-gel method that has significant advantages such as, high purity, good uniformity of the powder microstructure, low-temperature synthesis, and controlled reaction condition and it has been used for preparing of TiO2/ZnO nanocomposite [4, 7, 10,11,12]
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