摘要
以水热法合成的PbMoO4微晶体为催化剂,考察了反应溶液pH、污染物初始浓度和催化剂用量对光催化降解灭幼脲的影响,研究了光催化降解过程的反应动力学和作用机理.结果表明,最佳反应溶液pH 6.0、污染物初始浓度20 mg.L-1、催化剂用量0.4 g.L-1.反应4 h灭幼脲降解率达99.96%,矿化率达66.4%,降解反应符合一级动力学.通过加入自由基清除剂对比实验发现,PbMoO4微晶体主要通过空穴和.OH的氧化作用使灭幼脲降解,其中空穴起主要作用.
PbMoO4 microcrystals were prepared through a hydrothermal process and used for the photocatalytic degradation of chlorbenzuron.The kinetics and mechanism of the degradation reaction were investigated.The experimental results indicate that the optimum condition was observed at the pH of 6.0,the initial chlorbenzuron concentration of 20 mg·L-1,and the catalyst dosage of 0.4 g·L-1.The degradation rate reached 99.96% after 4 h irradiation and the TOC removal achieved 66.4%.The reaction kinetics could be described by a first-order process.It was demonstrated by addition of scavengers that the valence band holes and hydroxyl radicals played a significant part in the degradation of chlorbenzuron,in which the hole acted a dominant role.
出处
《环境化学》
CAS
CSCD
北大核心
2012年第5期641-645,共5页
Environmental Chemistry
基金
高等学校博士学科点专项科研基金(20100146110004)
湖北省自然科学基金(2011CDB139)
中央高校基本科研业务费专项资金(2011QC090)资助
关键词
光催化降解
PbMoO4
灭幼脲
动力学
反应机理
photocatalytic degradation
PbMoO4
chlorbenzuron
kinetics
reaction mechanism.
