Synthesis, characterization and photocatalytic properties of SnO2–ZnO composite under UV-A light

•SnO2–ZnO was successfully synthesized by precipitation–decomposition method.•This catalyst is found to be stable and reusable.•Treatment of dye effluent using SnO2–ZnO will be more economical and eco-friendly.•COD measurements reveal the complete mineralization of dye molecules. The SnO2 loaded ZnO...

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Bibliographic Details
Published in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2013-11, Vol.115, p.876-882
Main Authors: Kuzhalosai, V., Subash, B., Senthilraja, A., Dhatshanamurthi, P., Shanthi, M.
Format: Article
Language:English
Subjects:
Acid Orange 10
Photocatalysis
Reusability
SnO2 loaded ZnO
UV-A light
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Summary:•SnO2–ZnO was successfully synthesized by precipitation–decomposition method.•This catalyst is found to be stable and reusable.•Treatment of dye effluent using SnO2–ZnO will be more economical and eco-friendly.•COD measurements reveal the complete mineralization of dye molecules. The SnO2 loaded ZnO (SnO2–ZnO) was successfully synthesized by precipitation–decomposition method. The catalyst was characterized by X-ray diffraction (XRD), high resolution scanning electron microscope (HR-SEM) images, energy dispersive spectrum (EDS), diffuse reflectance spectra (DRS), photoluminescence spectra (PL) and BET surface area measurements. The photocatalytic activity of SnO2–ZnO was investigated for the degradation of Acid Orange 10 (AO 10) in aqueous solution using UV-A light. SnO2–ZnO is found to be more efficient than commercial ZnO, bare ZnO, TiO2-P25 and TiO2 (Merck) at pH 12 for the mineralization of AO 10 dye. The effects of operational parameters such as the amount of photocatalyst, dye concentration, initial pH on photo mineralization of AO 10 dye have been analyzed. The mineralization of AO 10 has been confirmed by chemical oxygen demand (COD) measurements. A degradation mechanism is proposed for the degradation of AO 10 with SnO2–ZnO under UV-A light. This catalyst is found to be reusable.
ISSN:1386-1425
DOI:10.1016/j.saa.2013.06.106