光电化学协同催化降解水中的扑草净.pdf

第24卷第7期
中国有色金属学报
Volume 24 Number 7
The Chinese Journal of Nonferrous Metals
July 2014
文章编号:1004-0609(2014)07-1915-06
光电化学协同催化降解水中的扑草净
唐建军12,陈益清2,李文龙2
(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:以网状铱钽钛电柲为阳极、石墨板为阴极、饱和甘汞电极为参比电极柲,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TO(TiO2P25)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HIO2能协助TO2可见光催化降解扑草净,反应300min后,扑草净降解卒达到100%6;
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(OHI)及超氧
自由基(O2)的产生和参与。
关键词:可见光催化;电生H2O2;扑草净;羟基自由基;超氧自由基
中图分类号:O643.3
文献标志码:A
Synergetic degradation of prometryn b:
photo-electro-chemical catalytic method
TANG Jian-jun, 2, CHEN Yi-qing, LI Wen-long?
(1. School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, China;
2. Shenzhen Key Laboratory of Industrial Water Conservation and
municipal Wastewater Resourees Technology, Shenzhen 518055, China)
Abstract: An electrochemical reactor with hydrogen peroxide in-situ generation was designed using net structure
titanium electrode coated with Iro Ta O (ir-ta/Ti)as the anode, graphite phase as the cathode and saturated calomel as
the reference electrode. The degradation of prometryn by Tio 2 photo-electro-chemical catalytic method was also studied
using anatase, rutile and mixing crystalline T O as hotocatalysts. The results indicate that prometryn can be degraded by
Tio 2 visible-light photocatalysis with electrolytic hydro en peroxide assi ance, 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(T) 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(O )in the system
Key words: visible light photocatalysis; electrolytic hydrogen peroxide; prometryn; hydroxyl free radical; superoxide
TiO2光催化作为一种基于羟基自由基(O过程光谱中紫外部分能量通常不到5%,实际应用时需要
的高级氧化技术,在应用于降解水中的有毒、有害、耗费大量的电能产生紫外光,致使这一高级氧化技术
难生物降解的有机污染物方面具有优势。但由于TiO2目前难以工程推广应用
的光吸收范围限于波长小于387nm的紫外区,而太阳
从利用太阳能角度出发,发展TO2可见光催化反
基金项目:广东省自然科学基金资助项目(2409K3080018);深圳市战略性新兴产业发展专项(ZDSY20120619093952884)
收稿日期:2013-11-20;修订日期:2014-03-27
通信作者:唐建军,教授,博士;电话:0755-26731157;E-mail: tangut7384@sina.con