摘要
磷酸三(2-氯乙基)酯(TCEP)是一种应用广泛的有机磷类阻燃剂.毒理学研究表明,TCEP可破坏内分泌系统,产生神经毒性、生殖毒性和发育毒性,对人类健康构成威胁.本研究采用紫外/过氧化氢(UV/H_(2)O_(2))体系完成TCEP的去除反应,通过调控水体Cl^(–)浓度和反应水体,探究TCEP的降解规律.研究结果表明,当水中Cl^(–)为0.1 mM时,TCEP获得最大的降解表观速率常数(k_(obs))2.10±0.30 h^(-1);当Cl^(–)小于或大于0.1 mM时,Cl^(–)均对TCEP的降解有抑制作用.此外,以四种实际水体(两种自来水、污水处理厂出水、海水)为反应介质参与的降解反应中,海水对于TCEP的降解具有明显抑制作用,k_(obs)仅为0.03±0.01 h^(-1).根据主成分分析(PCA),提取出两个主要因子PC1、PC2,贡献率分别为59.0%和35.0%.其中,k_(obs)与DO呈现正相关关系,而与电导率以及TOC呈现负相关关系.各样点在k_(obs)上的排序显示海水与其他三个样品(均为淡水)表现出较大的差异,这暗示海水中相关有机污染物的降解过程、机理可能不同于淡水,今后研究需要给予更多关注.
Tris(2-chloroethyl) phosphate(TCEP) is one of organophosphorus flame retardants(OPFRs) that has been widely used.Toxicological studies have confirmed that TCEP is a disruption of the endocrine system(such as reproductive and neurodevelopmental effects),and poses a threat to human health.In this study,TCEP was selected as representative OPFRs for the investigation of degradation mechanisms during UV/H_(2)O_(2).The results showed that when Cl^(–) was 0.1 mM,TCEP obtained the maximum pseudo first-order decay rate(k_(obs)) of 2.10±0.30 h^(-1).When Cl^(–) was less than or greater than 0.1mM,ithad an inhibitory effect on the degradation of TCEP.Additionally,in the degradation reaction with four actual water bodies(two types of tap water,sewage treatment plant effluent and seawater) as the reaction medium,seawater had a significant inhibitory effect on the degradation of TCEP,and the k_(obs)was 0.03±0.01 h^(-1).According to the principal component analysis(PCA),two main factors PC1 and PC2 were extracted,with contribution of 59.0% and 35.0%,respectively.Among them,k_(obs) showed a positive correlation with DO,but a negative correlation with conductivity and TOC.The ranking of the samples on k_(obs) illustrated that seawater showed great differences from the other three samples(all freshwater),which suggested that the degradation process and mechanism of related organic pollutants in seawater may be dissimilar from freshwater,and more attention needs to be paid to future research.
作者
韦柳情
刘佳
陈一波
唐亮
景连东
WEI Liu-qing;LIU Jia;CHEN Yi-bo;TANG Liang;JING Lian-dong(School of Chemistry and Environment,Southwest Minzu University,Chengdu 610041,China)
出处
《西南民族大学学报（自然科学版）》
CAS
2023年第3期269-274,共6页
Journal of Southwest Minzu University(Natural Science Edition)
基金
国家自然科学基金青年科学基金项目(41907283)
四川省自然科学基金项目(2022NSFSC1158)。
