Highly active WO3aAgaZnO photocatalyst driven by day light illumination

The WO3 loaded AgaZnO (WO3aAgaZnO) was successfully synthesized by precipitationadecomposition method. The catalyst was characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM) images, energy dispersive spectrum (EDS), transmission electron microscope (TEM), dif...

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Bibliographic Details
Published in:Superlattices and microstructures 2013-02, Vol.54, p.155-171
Main Authors: Subash, B, Krishnakumar, B, Sreedhar, B, Swaminathan, M, Shanthi, M
Format: Article
Language:English
Subjects:
Catalysts
Degradation
Dyes
Mineralization
Photocatalysis
Scanning electron microscopy
Titanium dioxide
Tungsten oxides
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Summary:The WO3 loaded AgaZnO (WO3aAgaZnO) was successfully synthesized by precipitationadecomposition method. The catalyst was characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM) images, energy dispersive spectrum (EDS), transmission electron microscope (TEM), diffuse reflectance spectra (DRS), photoluminescence spectra (PL), cyclic voltammetry (CV) and BET surface area measurements. The photocatalytic activity of WO3aAgaZnO was investigated for the degradation of Naphthol Blue Black (NBB) in aqueous solution using solar light. WO3aAgaZnO is found to be more efficient than AgaZnO, WO3aZnO, AgaWO3, WO3, commercial ZnO, bare ZnO, TiO2aP25 and TiO2 (Merck) at pH 9 for the mineralization of NBB dye. The effects of operational parameters such as the amount of photocatalyst, dye concentration, initial pH on photo mineralization of NBB dye have been analyzed. The mineralization of NBB has been confirmed by Chemical Oxygen Demand (COD) measurements. A degradation mechanism is proposed for the degradation of NBB under solar light. This catalyst is found to be reusable.
ISSN:0749-6036
DOI:10.1016/j.spmi.2012.11.009