Degradation law and reaction path of dibromochloronitromethane under UV irradiation

被引：0
|
作者：
Huang T. [1 ]
Deng L. [1 ]
Wen L. [1 ]
机构：
[1] School of Civil Engineering, Southeast University, Nanjing
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2022年 / 52卷 / 03期
关键词：
Dibromochloronitromethane (DBCNM); Kinetics; Photodegradation; Reaction pathway; Ultraviolet (UV);
D O I：
10.3969/j.issn.1001-0505.2022.03.021
中图分类号：
学科分类号：
摘要：
To explore the degradation law of dibromochloronitromethane (DBCNM) under ultraviolet (UV) irradiation, the effects of light intensity, initial concentration, pH value, free chlorine concentration, and bromide ion concentration on the photodegradation of DBCNM were studied by using a low-pressure mercury lamp UV254. Experimental results show that the photodegradation of DBCNM under UV irradiation (15.5 mW/cm2) fits the first-order reaction kinetics model, and its degradation rate constant is 0.303 9 min-1. The photodegradation rate of DBCNM decreases with the increase of initial concentration, and increases with the increase of light intensity, pH value, free chlorine concentration and bromide ion concentration. The additions of free chlorine and bromide ion promote the conversion of DBCNM into other halonitromethanes (HNMs) under UV irradiation. In other formed HNMs, bromonitromethane (BNM) and bromodichloronitromethane (BDCNM) contribute more cytotoxicity, while BNM, BDCNM and bromochloronitromethane (BCNM) contribute more genotoxicity. Finally, DBCNM is converted into inorganic ions through oxidation, addition and hydrolysis reactions, reducing the risk of water safety. © 2022, Editorial Department of Journal of Southeast University. All right reserved.
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页码：586 / 593
页数：7
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