(1. 深圳职业技术学院 建筑与环境工程学院，深圳 518055；
2. 深圳市工业节水与城市污水资源化技术重点实验室，深圳 518055)
摘 要: 以网状铱钽钛电极为阳极、石墨板为阴极、饱和甘汞电极为参比电极，设计一种在线生成H2O2的电化学反应器，并以锐钛矿、金红石及混晶TiO2(TiO2-P25)为光催化剂，研究TiO2光催化学协同电化学催化降解扑草净的过程。结果表明：电生H2O2能协助TiO2可见光催化降解扑草净，反应300 min后，扑草净降解率达到100%；在扑草净的降解过程中，外层的甲基、硫基及氨基被氧化脱除，降解过程生成多种中间产物，降解终产物为三聚氰酸，总有机碳的去除率为60%~70%。对反应体系的光谱分析显示：扑草净的降解涉及羟基自由基(·OH)及超氧自由基(·O2-)的产生和参与。
关键字: 可见光催化；电生H2O2；扑草净；羟基自由基；超氧自由基
（1. School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, China;
2. Shenzhen Key Laboratory of Industrial Water Conservation and
Municipal Wastewater Resources Technology, Shenzhen 518055, China）
Abstract:An electrochemical reactor with hydrogen peroxide in-situ generation was designed using net structure titanium electrode coated with IrO2.Ta2O3(Ir-Ta/Ti) as the anode, graphite phase as the cathode and saturated calomel as the reference electrode. The degradation of prometryn by TiO2 photo-electro-chemical catalytic method was also studied using anatase, rutile and mixing crystalline TiO2 as photocatalysts. The results indicate that prometryn can be degraded by TiO2 visible-light photocatalysis with electrolytic hydrogen peroxide assitance, and the degradation rate reaches 100% after 300 min reaction. In the degradation process of prometryn, the methyl, thio and amino groups in the outer layer are oxidized, the removal rate of total organic carbon (TOC) reaches 60%-70%, and the end product of prometryn degradation is cyanuric acid. Spectrum analysis results indicate that the degradation of prometryn involves the generation and participation of hydroxyl free radical (·OH) and superoxide radical (·O2-) in the system.
Key words: visible light photocatalysis; electrolytic hydrogen peroxide; prometryn; hydroxyl free radical; superoxide radical
