ZnIn2S4/g-C3N4光催化降解水中痕量药物卡马西平

本文采用水热合成法制备ZnIn₂S₄/g-C₃N₄复合催化剂应用于水中痕量药物卡马西平（CBZ）的太阳光催化降解，探究实际河水中固体颗粒（SS），无机盐（IS）和溶解性有机物（DOM）对催化剂活性的影响以及ZnIn₂S₄/g-C₃N₄/浮石负载型催化剂光催化CBZ效果.结果表明，质量比为20：1 ZnIn₂S₄/g-C₃N₄的光催化活性高于ZnIn₂S₄，ZnIn₂S₄与g-C₃N₄异质结构加速了电子-空穴对的分离并抑制其复合、ZnIn₂S₄/g-C₃N₄中孔的增多和比表面积的增加有效提高了催化剂活性.水质参数对催化剂活性的影响顺序为DOM>IS>SS，过滤后河水中CBZ的光催化速率常数比原水提高了13倍；125mg/L催化剂投加量和太阳光照射240min后，100μg/L的CBZ被完全降解.动态试验中CBZ的光催化效率随水流速度的增大而下降；流速5mL/min下循环4次，ZnIn₂S₄/g-C₃N₄/浮石光催化降解与矿化CBZ的效率分别为86.4%和43.9%.

Photocatalytic degradation of trace carbamazepine in river water by ZnIn2S4/g-C3N4 under solar irradiation

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.