TiO_2可见光催化H_2O_2降解特丁津的降解过程

Process of Terbuthylazine Degradation by H_2O_2 Catalyzed by TiO_2 under Visible Irradiation

以混晶TiO_2(P25)为光催化剂,研究了可见光下TiO_2催化H_2O_2降解内分泌干扰物特丁津的降解过程。结果表明,H_2O_2是影响特丁津降解率的主要因素,实际操作中控制H_2O_2与特丁津的初始摩尔浓度比为43较为适宜;反应300 min特丁津的降解率达86%,H_2O_2基本分解完全,但总有机碳(TOC)去除率仅20%,反应体系生成了多种中间产物。液相色谱-质谱(LC-MS)分析表明,特丁津的降解由脱氯开始,并脱乙基及脱特丁基,氮以氨基形式存在于降解产物4,6-二氨基-2-羟基-1,3,5-三嗪中;通过对反应体系的荧光光谱分析显示,特丁津的降解涉及·OH自由基等活性物种的产生和参与。

The process of terbuthylazine degradation by H2O2 catalyzed by photocatalyst mischcrystal TiO2（ P25 ） under visible irradiation was investigated. The results indicated that H2O2 concentration was the main factor affecting terbuthylazine degradation. The optimum initial mole ratio of H2O2 and terbuthylazine was 43：1 in the actual operation. After reaction for 300 min, the degradation rate of terbuthylazine was about 86% with H2O2 decomposed completely, the removal rate of TOC was only about 20%. There were multiple intermediate products generated in the reaction system. LC-MS analysis indicated that the degradation of terbuthylazine began with dechlorination, and then deethylation and detertbutylation. Nitrogen remained in the degradation product ammeline in the form of amidogen. The fluorescence spectrum analysis showed that the degradation of terbuthylazine species such as OH free radicals.