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王利平教授课题组在“ESPR”发表研究论文

   发布时间: 2015-09-23    访问次数: 669

 

Comparative study of diethyl phthalate degradation by UV/H2O2 and UV/TiO2: kinetics, mechanism and effects of operational parameters

Chengjie Song, Liping Wang*, Jie Ren, Bo Lv, Zhonghao Sun, Jing Yan,Xinying Li, Jingjing Liu

Environmental Science and Pollution Research, 2015,DOI: 10.1007/s11356-015-5481-8

Abstract:The photodegradation of diethyl phthalate (DEP) by UV/H2O2 and UV/TiO2 is studied. The DEP degradation kinetics and multiplecrucial factorseffecting the clearance of DEP are investigated, including initial DEP concentration ([DEP]0), initial pH values (pH0), UV light intensity, anions (Cl-, NO3-, SO42-, HCO3- and CO32-), cations (Mg2+, Ca2+, Mn2+ and Fe3+) and humic acid (HA). TOC removal is tested by two treatments. And cytotoxicity evolution of DEP degradation intermediates is detected. The relationship between molar ratio ([H2O2]/[DEP] or [TiO2]/[DEP]) and degradation kinetic constant (K) is also studied. And the cytotoxicity tests of DEP and its degradation intermediates in UV/H2O2 and UV/TiO2 treatments are researched. The DEP removal efficiency of UV/H2O2treatment is higher than UV/TiO2 treatment. The DEP degradationfitted a pseudo-first-order kinetics pattern under experimental conditions. The K linearly relatedwith molar ratio in UV/H2O2 treatment while natureexponential relationship is observed in the case of UV/TiO2. However, K fitted corresponding trends betterin H2O2 treatmentthan in TiO2 treatment. The Cl-isin favor of the DEP degradation in UV/H2O2 treatment, in contrast, it isdisadvantageous to the DEP degradation in UV/TiO2 treatment. Other anions are all disadvantageous to the DEP degradation in two treatments. Fe3+ promotes the degradation rates significantly. And all other cations in questioninhibit the degradation of DEP. HA hinders DEP degradation in two treatments. The intermediates of DEP degradation in UV/TiO2 treatment are less toxic tobiological cell, than that in UV/H2O2 treatment.