Journal of Surface Science and Technology

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Photo-Catalytic Activity of Ag-N Co-Doped ZnO/CuO Nanocomposite for Degradation of Methyl Orange


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1 Chemistry Department, Haramaya University, Post Box: 138, Dire Dawa, Ethiopia
     

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Nano-size Ag-N co-doped ZnO-CuO composites have been synthesized and tested for their photo-catalytic activity towards degradation of methyl orange in aqueous solution under visible as well as UV radiations. Crystal structure, surface functional groups, metallic composition and band structure of as-synthesized nano-material were investigated using XRD, FTIR, AAS and UV-Vis spectroscopic techniques, respectively. Ag-N co-doped ZnO-CuO photocatalyst showed higher photo-catalytic activity than Ag- or N-doped and undoped composite photocatalysts. The observed highest activity of Ag-N co-doped ZnO-CuO among the studied photo-catalysts, is attributed to the cumulative effects of lowering of band-gap energy and decrease of recombination rate of photo-generated electrons and holes owing to doped N and Ag, respectively. Effects of photo-catalyst load, solution pH and substrate initial concentration on the degradation of methyl orange have also been studied.

Keywords

Band-Gap, Degradation, Nanocomposite, Photocatalysts, Rate Constant, Spectroscopy.
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  • Photo-Catalytic Activity of Ag-N Co-Doped ZnO/CuO Nanocomposite for Degradation of Methyl Orange

Abstract Views: 320  |  PDF Views: 2

Authors

Jemal Mohammed Yasin
Chemistry Department, Haramaya University, Post Box: 138, Dire Dawa, Ethiopia
O. P. Yadav
Chemistry Department, Haramaya University, Post Box: 138, Dire Dawa, Ethiopia
Abi M. Taddesse
Chemistry Department, Haramaya University, Post Box: 138, Dire Dawa, Ethiopia

Abstract


Nano-size Ag-N co-doped ZnO-CuO composites have been synthesized and tested for their photo-catalytic activity towards degradation of methyl orange in aqueous solution under visible as well as UV radiations. Crystal structure, surface functional groups, metallic composition and band structure of as-synthesized nano-material were investigated using XRD, FTIR, AAS and UV-Vis spectroscopic techniques, respectively. Ag-N co-doped ZnO-CuO photocatalyst showed higher photo-catalytic activity than Ag- or N-doped and undoped composite photocatalysts. The observed highest activity of Ag-N co-doped ZnO-CuO among the studied photo-catalysts, is attributed to the cumulative effects of lowering of band-gap energy and decrease of recombination rate of photo-generated electrons and holes owing to doped N and Ag, respectively. Effects of photo-catalyst load, solution pH and substrate initial concentration on the degradation of methyl orange have also been studied.

Keywords


Band-Gap, Degradation, Nanocomposite, Photocatalysts, Rate Constant, Spectroscopy.

References





DOI: https://doi.org/10.18311/jsst%2F2016%2F6602