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INVESTIGATION OF THE EFFICIENCY OF SnO2 COUPLING ON PHOTOCATALYTIC ACTIVITY OF ZnO

N. Modirshahla, M. A. Behnajady, A. Hassani

Abstract

With developing industries particularly dying industries and complication in the structure of dye molecules and resulting wastewaters from these plants cause a serious threat to the environment (due to resistance to biological treatment). The aim of this study was to investigate the efficiency of coupled system (UV/ZnO+SnO2) in the removal of acid yellow 23 (AY23) a mono-azo dye from aqueous solutions. In these experiments ZnO and SnO2 were employed in a single and coupled form in slurry conditions and the optimum condition was determined for removal of the dye. In each run the concentration of AY23 was 40 mg/l using low pressure mercury lamp (30 W). The optimum amount of ZnO was 900 mg/l. The coupled suspension was prepared using ZnO and SnO2 with concentrations of 700 mg/l and 200 mg/l respectively. The results revealed that coupled system was more effective than single one and the best removal was achieved in the ratio of 7:2 (ZnO : SnO2). The decolorization of 84.3\% occurred with coupled system (700:200) mg/l after 20 min of irradiation where as 78.2\% decolorization was achieved with single ZnO (900 mg/l) at the same reaction time.

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