Kinetics and mechanism for methiocarb degradation by chlorine dioxide in aqueous solution

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境水质学国家重点实验室

	Kinetics and mechanism for methiocarb degradation by chlorine dioxide in aqueous solution
	Tian, Fang ; Qiang, Zhimin ; Liu, Chao ; Zhang, Tao ; Dong, Bingzhi
刊名	CHEMOSPHERE
	2010-04
卷号	79 期号:6 页码:646-651
关键词	Methiocarb Chlorine dioxide Kinetics Mechanism Byproducts Water treatment
中文摘要	The kinetics and mechanism for methiocarb (MC) degradation by aqueous ClO(2) were investigated under simulated water treatment conditions. Experimental results indicate that the reaction between MC and ClO(2) was of second-order overall, and the rate constant rapidly increased from 0.56 to 4.5 M(-1) s(-1) as the solution pH increased from 6.0 to 9.1 at 23 degrees C. The activation energy was determined to be 75 kJ mol(-1) in the studied temperature range of 7-35 degrees C. Methiocarb sulfoxide (MCX) and methiocarb sulfone (MCN) were quantified to be the major byproducts from MC degradation. Unlike the sequential formation of sulfoxide and sulfone during the oxidation of many thioethers, the two byproducts were formed simultaneously during MC degradation by ClO(2). The solution pH significantly affected the type and quantity of the degradation byproducts. For example, at pH 6.5 MCX and MCN accumulated as the reaction proceeded and finally accounted for 71% and 28% of MC degraded, respectively; while at pH 8.6 three more minor byproducts were identified. Though ClO(2) can effectively oxidize MC in water, the significant increase in toxicity raises a potential risk to consumers. (C) 2010 Elsevier Ltd. All rights reserved.
WOS记录号	WOS:000277546600006
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/21250]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Tian, Fang,Qiang, Zhimin,Liu, Chao,et al. Kinetics and mechanism for methiocarb degradation by chlorine dioxide in aqueous solution[J]. CHEMOSPHERE,2010,79(6):646-651.
APA	Tian, Fang,Qiang, Zhimin,Liu, Chao,Zhang, Tao,&Dong, Bingzhi.(2010).Kinetics and mechanism for methiocarb degradation by chlorine dioxide in aqueous solution.CHEMOSPHERE,79(6),646-651.
MLA	Tian, Fang,et al."Kinetics and mechanism for methiocarb degradation by chlorine dioxide in aqueous solution".CHEMOSPHERE 79.6(2010):646-651.