Korean Journal of Chemical Engineering, Vol.32, No.8, 1578-1585, August, 2015
Photocatalytic degradation of 2,4-dichlorophenol over Fe-ZnO catalyst under visible light
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Fe-ZnO was synthesized via impregnation and applied to photocatalytic degradation of 2,4-dichlorophenol (2,4-DCP) under visible light. Conditions of Fe-ZnO synthesis which included a Fe content and a calcination temperature were focused. From UV-DRS, visible light absorption of Fe-ZnO samples increased with increasing of Fe content and calcination temperature. TEM images revealed Fe species (FeO, Fe3O4, and Fe2O3) on ZnO as a function of calcination temperature. XANES analysis confirmed the majority of Fe3+ content. Response surface methodology (RSM) dominating over experimental design and statistical analysis for 2,4-DCP photocatalytic degradation indicated that the high degradation efficiency was associated with calcination temperature of 680-700 oC, Fe content of 4.5-5.0mol%, and catalyst loading of 1.2-1.8 g L.1. Moreover, addition of 2mM of K2S2O8 in a 5.0Fe-ZnO@700 oC system could enhance the degradation efficiency to a completion within 90 min. The kinetics of 2,4-DCP photocatalytic degradation well fit the Langmuir-Hinshelwood model.
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