Abstract
Humic acid (HA) is a major component of natural organic substances and affects water quality, such as color, taste and odor. Therefore, removal of HA from surface water or wastewater is very important. In this paper, the photodegradation kinetics of these compounds using TiO2/ZnO/Co composite photocatalyst under visible light irradiation was investigated. The progress of photocatalytic degradation of the HA has been observed by measuring the absorbance in UV-Visible spectrophotometer. The results reveal that the TiO2/ZnO/Co composite photocatalyst exhibits much better photocatalytic activity than those of pure TiO2 and TiO2/ZnO on photodegradation of HA under visible light irradiation, with degradation rate constants were found 0.0163, 0.0079 and 0.0032 (min-1), respectively.
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