摘要
以TiO2-P25为光催化剂,内分泌干扰物扑草净作模型污染物,研究了H2O2助TiO2可见光催化降解扑草净的反应特性.表明H2O2能助TiO2可见光催化降解扑草净,反应120 min时,扑草净的降解率达80%;反应过程中,控制溶液体系的pH值为3.0左右、H2O2与扑草净的初始浓度比约45∶1较为适宜;在扑草净的降解过程中,甲基、硫基及氨基被氧化脱除,NO-3、SO2-4被持续释放出来,TOC去除率达70%,降解终产物为三聚氰酸;通过对反应体系的光谱分析显示,H2O2吸附于TiO2表面形成复合物结构,在可见光作用下转为自由基等活性物种,扑草净的降解涉及羟基自由基(·OH)的产生与参与.
The degradation of prometryn by TiO2-P25 visible-light photocatalysis with H202 assiatance was studied. The results indicated that prometryn could be degraded by TiO2 visible-light photocatalysis with H2O2 assiatance, and the degradation ratio could be 80% after 120 min reaction. It was appropriate to control pH and the ratio of [ HaO2 ]/[ prometryn ] to be 3.0 and 45, respectively. In the degradation process of prometryn, methyl, thio and amino groups were oxidized as NOr and SO4-, the removal ratio of TOC reached 70% , and the end product of prometryn degradation was cyanuric acid. Spectrum analysis indicated that the composite structures by H2O2 adsorbing on the TiO2 surface was converted to free radicals under visible light, and the reaction process was predominated by the hydroxyl free radical（ ·OH） generation in the system.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2014年第1期55-59,共5页
Journal of Zhengzhou University（Engineering Science）
基金
深圳市战略性新兴产业发展专项(ZDSY20120619093952884)
关键词
可见光催化
二氧化钛
过氧化氢
扑草净
羟基自由基
visible light photocatalytic
titanium dioxide
hydrogen peroxide
prometryn
hydroxyl free radi- cal
