一溴一氯硝基甲烷的紫外光降解  

Photodegradation of bromochloronitromethane under UV irradiation

作　　者：戴文娟 邓琳[1] 徐焱钰 文隆佳 Dai Wenjuan;Deng Lin;Xu Yanyu;Wen Longjia(School of Civil Engineering, Southeast University, Nanjing 211189, China)

机构地区：[1]东南大学土木工程学院,南京211189

出　　处：《东南大学学报（自然科学版）》2020年第4期760-766,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(21677032);国家重点研发计划资助项目(2017YFC0504505)。

摘　　要：为了研究一溴一氯硝基甲烷(BCNM)在紫外光条件下的降解规律,实验考察了紫外光照强度、初始浓度、pH、自由氯浓度和溴离子浓度对BCNM光降解的影响.实验结果表明:BCNM的光降解率随紫外光照强度、pH的增大而上升,随BCNM初始浓度的增大而下降;当反应溶液中加入自由氯和溴离子时,BCNM的光降解率随加入浓度的增大而上升;当加入自由氯时,BCNM在光降解的同时会有一溴二氯硝基甲烷(BDCNM)、二氯硝基甲烷(DCNM)、一氯硝基甲烷(CNM)、三氯硝基甲烷(TCNM)和一溴硝基甲烷(BNM)生成,且生成量随反应时间先升后降,其峰值随自由氯浓度的增大而增大.BCNM初始质量浓度在0~600μg/L范围内时,其紫外光降解符合准一级反应动力学方程.此研究可为在饮用水和污水消毒过程中控制BCNM的生成提供帮助.To study the photodegradation of bromochloronitromethane(BCNM)under ultraviolet(UV)irradiation,the effects of UV light intensity,initial concentration,pH,free chlorine and bromide ions on the photodegradation of BCNM were investigated.The results show that the photodegradation of BCNM increases with the increase in UV light intensity and pH,but decreases with the increase in initial concentration.When free chlorine and bromide ions are added,the photodegradation of BCNM increases with the increase in the concentration of added substances.Besides,when free chlorine is added,BCNM is degraded together with the formation of bromodichloronitromethane(BDCNM),dichloronitromethane(DCNM),chloromethane(CNM),trichloronitromethane(TCNM)and bromonitromethane(BNM).The production increases initially and then decreases with the reaction time and the peak increases with the increase in free chlorine concentration.The photodegradation of BCNM under UV irradiation follows the quasi-first-order reaction kinetics equation when the concentration of BCNM is in the range from 0 to 600μg/L.This study can help control the production of BCNM during the disinfection of drinking water and wastewater.

关 键 词：一溴一氯硝基甲烷 紫外光照 光降解 动力学 

分 类 号：X502[环境科学与工程—环境工程]