Photocatalytic degradation of trace carbamazepine in river water by ZnIn2S4/g-C3N4 under solar irradiation
ZHU Lin1, BO Long-li1,2,3, LIU Jia-dong1,2,3
1. School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; 2. Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi'an 710055, China; 3. Key Laboratory of Environmental Engineering of Shaanxi Province, Xi'an 710055, China
Abstract:ZnIn2S4/g-C3N4 composite catalyst prepared by hydrothermal method was applied to catalyze trace carbamazepine (CBZ) in river water under solar irradiation. The effect of suspended solid (SS), inorganic salt (IS), and dissolved organic matter (DOM) in real river water on the catalytic activity of ZnIn2S4/g-C3N4 composite catalyst and the experimental effect in dynamic tests of ZnIn2S4/g-C3N4/pumice loaded catalyst to CBZ were both analyzed. It indicated that the catalytic activity of ZnIn2S4/g-C3N4 with mass ratio of 20:1 was higher than that of pure ZnIn2S4 in CBZ photocatalytic degradation. The heterogeneous structure of ZnIn2S4/g-C3N4 accelerated the separation of electron-hole pairs and simultaneously prohibited their recombination. An increase in the amount of mesopore and an increase in specific surface area of ZnIn2S4/g-C3N4 both could improve the catalytic activity of the catalyst effectively. The influence of water quality parameters on the catalyst activity in an increasing sequence was DOM>IS>SS, and the constant of photocatalytic rate of CBZ in filtered river water increased 13times than that in raw river water. CBZ of an initial concentration of 100μg/L was completely degraded with a dosage of 125mg/L catalyst and under 240min solar irradiation. In dynamic tests, the photocatalytic efficiency of CBZ decreased gradually with an increase in the flow rate of water. Under 4cycles with a flow rate of 5mL/min, the rate of removal and the rate of mineralization of CBZ by ZnIn2S4/g-C3N4/pumice catalyst were 86.4% and 43.9%, respectively.
朱琳, 卜龙利, 刘嘉栋. ZnIn2S4/g-C3N4光催化降解水中痕量药物卡马西平[J]. 中国环境科学, 2020, 40(7): 2917-2925.
ZHU Lin, BO Long-li, LIU Jia-dong. Photocatalytic degradation of trace carbamazepine in river water by ZnIn2S4/g-C3N4 under solar irradiation. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(7): 2917-2925.
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