UV/H2O2 oxidation of tri(2-chloroethyl) phosphate: Intermediate products, degradation pathway and toxicity evaluation  

作　　者：Qiuyi Ji Huan He Zhanqi Gao Xiaohan Wang Shaogui Yang Cheng Sun Shiyin Li Yong Wang Limin Zhang 

机构地区：[1]School of Environment,Nanjing Normal University,Nanjing 210023,China [2]State Environmental Protection Key Laboratory of Monitoring and Analysis for Organic Pollutants in Surface Water,Environment Monitoring Center of Jiangsu,Nanjing 210036,China [3]State Key Laboratory of Pollution Control and Resources Reuse,School of Environment,Nanjing University,Nanjing 210023,China [4]School of Environment,Northeast Normal University,Changchun 130024,China

出　　处：《Journal of Environmental Sciences》2020年第12期55-61,共7页环境科学学报（英文版）

基　　金：supported by the National Nature Science Foundation of China (No. 21777067);the Primary Research&Development Plan of Jiangsu Province (No. BE2019679);Open Fund of National Key Laboratory of Collaborative Control and Remediation of Soil and Water Pollution for Environmental Protection (No. GHBK-001);the Open Fund of the State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration,Northeast Normal University (No. 130028903)。

摘　　要：Tri(2-chloroethyl) phosphate(TCEP) with the initial concentration of 5 mg/L was degraded by UV/H2O2 oxidation process. The removal rate of TCEP in the UV/H2O2 system was 89.1% with the production of Cl-and PO4^3- of 0.23 and 0.64 mg/L. The removal rate of total organic carbon of the reaction was 48.8% and the pH reached 3.3 after the reaction. The oxidative degradation process of TCEP in the UV/H2O2 system obeyed the first order kinetic reaction with the apparent rate constant of 0.0025 min^-1( R^2 = 0.9788). The intermediate products were isolated and identified by gas chromatography-mass spectrometer. The addition reaction of HO · and H2O and the oxidation reaction with H2O2 were found during the degradation pathway of 5 mg/L TCEP in the UV/H2O2 system. For the first time, environment risk was estimated via the "ecological structure activity relationships" program and acute and chronic toxicity changes of intermediate products were pointed out. The luminescence inhibition rate of photobacterium was used to evaluate the acute toxicity of intermediate products. The results showed that the toxicity of the intermediate products increased with the increase of reaction time, which may be due to the production of chlorine compounds. Some measures should be introduced to the UV/H2O2 system to remove the highly toxic Cl-containing compounds, such as a nanofiltration or reverse osmosis unit.

关 键 词：Tri(2-chloroethyl)phosphate(TCEP) UV/H2O2 MECHANISMS Toxicity evaluation 

分 类 号：X503.1[环境科学与工程—环境工程]