紫外激活过硫酸盐降解莠灭净的动力学研究  

Kinetic study of ametryn degradation by UV activated persulfate

作　　者：李卫平[1] 王超慧[1] 于玲红[1] 高乃云[2] 杨文焕[1] LI Wei-ping;WANG Chao-hui;YU Ling-hong;GAO Nai-yun;YANG Wen-huan(School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010,China;State Key Laboratory of Pollution Control & Resources Reuse, Tongji University,Shanghai 200092, China)

机构地区：[1]内蒙古科技大学能源与环境学院,内蒙古包头014010 [2]同济大学污染控制与资源化研究国家重点实验室,上海200092

出　　处：《中国环境科学》2016年第11期3341-3347,共7页China Environmental Science

基　　金：国家科技重大项目(2012ZX07403-001)

摘　　要：采用紫外(UV)激活过硫酸盐(PS)氧化降解水中莠灭净(AMT).比较了单独UV和UV/PS两种工艺的降解效果和经济性,并考察了底物初始浓度、PS投加量以及反应初始pH值3个因素对UV/PS去除AMT动力学的影响.同时采用间接法对反应中生成的主要自由基进行了鉴定.结果表明:UV/PS比单独UV系统降解AMT更经济有效.AMT降解过程符合准一级动力学模型(R^2≥0.95),随着底物浓度的增加,准一级反应速率常数k_(obs)逐渐减小;k_(obs)随PS投加量的增加逐渐增大;控制pH为5~10时,k_(obs)逐渐减小,pH值为5时,k_(obs)达到最大值,为0.0540min^(-1);pH为7时反应中主要生成的自由基为·SO_4^-.The degradation of the ametryn (AMT) by means of UV/Persulfate (PS) was investigated.The effect ofdegradation and economical efficiency were compared between UV and UV/PS, while emphasis was given on the effectof initial substrate concentration, PS dosage, and initial pH for the kinetics of AMT degradation by UV/PS. The mainradical generated in the reaction were identified using the indirect method. The results showed that degradation of AMTby UV/PS was more cost-effective than UV alone . AMT degradation follows the first-order kinetic well (R2≥0.95), thepersudo-first-order-constant kobs decreases with the increase of AMT concentration;the value of kobs was magnifiedgradually with the increasing PS dosage; controlling the pH of 5~10, kobs reaches the top of 0.0540min-1when pH=5; themain radical generated is ?SO4- when pH=7.

关 键 词：过硫酸盐 莠灭净 影响因素 动力学 

分 类 号：X703[环境科学与工程—环境工程]