Kinetic degradation of chloramphenicol in water by UV/persulfate system
Kinetic degradation of chloramphenicol in water by UV/persulfate system
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紫外/过硫酸盐系统动力学降解水中氯霉素
DOI：
10.1016/j.jphotochem.2016.09.021
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发表时间：
2017-01-01
影响因子：
4.3
通讯作者：
Xiang, Huiming
中科院分区：
文献类型：
--
作者：
Tan, Chaoqun;Fu, Dafang;Xiang, Huiming
系统研究了直接紫外光（UV）照射、过硫酸盐（PS）单独氧化和UV照射活化过硫酸盐（UV/PS）工艺对氯霉素（CAP）的降解性能。UV/PS氧化比直接UV照射或单独PS氧化更优越上级。UV/PS体系中同时存在SO 4-中心点和HO中心点，清除自由基实验证明SO 4-中心点是UV/PS体系中的主要自由基。CAP与SO_4-中心点间的二级反应速率常数为1.33 × 10~（10）M（-1）s（-1）。CAP的降解符合拟一级动力学方程（R-2> 0.95）。较高的PS投加量、较低的CAP初始浓度和酸性pH促进CAP的降解。当[CAP]（o）= 0.03 mM，[PS]（o）= 1.0 mM时，系统在120 min内对TOC的去除率最高，为31.7%，系统的每阶电能（EE/O）为16.76 kWh/m3/order。表明UV/PS系统是控制CAP等新兴污染物引起的水污染的潜在替代方案。(C)2016爱思唯尔B.V.保留所有权利。
Performances of chloramphenicol (CAP) degradation by direct ultraviolet (UV) irradiation, persulfate (PS) oxidation alone and UV irradiation-activated persulfate process (UV/PS) were systematically studied. UV/PS oxidation was superior over direct UV irradiation or PS oxidation alone. Both SO4-center dot and HO center dot were existing in UV/PS system, and SO4-center dot was proved to be the primary radical species through the scavenging tests. The secondary order reaction rate constant between CAP and SO4-center dot was estimated to be 1.33 x 10(10)M(-1) s(-1). The CAP degradation fitted the pseudo-first-order kinetics well (R-2>0.95) in tests. Higher PS dosage, lower initial CAP concentration and acid pH promoted the CAP degradation. A maximum TOC removal of 31.7% was observed in 120 min at conditions of [CAP](o) = 0.03 mM and [PS](o) = 1.0 mM. At last, the electrical energy per order (EE/O) value in system was demonstrated to be 16.76 kWh/m(3)/order.Results: indicated that the UV/PS system is potential alternative to control water pollution caused by emerging contaminants such as CAP. (C) 2016 Elsevier B.V. All rights reserved.