UV/H_2O_2和UV/TiO_2降解邻苯二甲酸二乙酯的对比研究:动力学,机理,性能及反应参数

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• 英文论文题名：Comparative study of diethyl phthalate degradation by UV/H_2O_2 and UV/TiO_2: kinetics, mechanism and effects of operational parameters
• 论文作者：宋澄杰 ; 王威 ; 崔福义
• 英文论文作者：Chengjie Song ; Wei Wang ; Fuyi Cui ; State Key Laboratory of Urban Water Resources and Environments (SKLUWRE) ; School of Municipal and Environmental Engineering ; Harbin Institute of Technology
• 年：2016
• 作者机构：哈尔滨工业大学市政环境工程学院城市水资源与环境国家重点实验室;
• 论文关键词：邻苯二甲酸二乙酯 ; 高级氧化过程 ; 过氧化氢 ; 二氧化钛
• 会议召开时间：2016-07-01
• 会议录名称：中国化学会第30届学术年会摘要集-第三十七分会：纳米催化
• 语种：中文
• 分类号：O643.3;O644.1
• 学会代码：ZGHY
• 会议名称：中国化学会第30届学术年会-第三十七分会 ; 纳米催化
• 会议地点：中国辽宁大连
• 主办单位：中国化学会
• 学会名称：中国化学会
• 页数：2
• 文件大小：200k
• 原文格式：D
• 会议级别：全国

摘要

针对UV/H_2O_2和UV/TiO_2光催化降解邻苯二甲酸二乙酯(DEP)进行了对比研究。对于光催化降解DEP的过程中多个影响因素,包括最初的DEP浓度([DEP]_0),初始pH值(pH_0)、紫外线强度、阴离子(Cl~-,NO_3~-,SO_4~(2-),HCO_3~-和CO_3~(2-))、阳离子(Mg~(2+)、Ca~(2+),Mn~(2+)、Fe~(3+))和腐殖酸(HA)进行了分析对比。[H_2O_2]/[DEP]或[TiO_2]/[DEP]的配比和降解动力学常数(K)的关系也进行了研究。而且,针对DEP降解中间产物的细胞毒性进行了检测,研究了DEP和UV/H_2O_2和UV/TiO_2处理其降解产物的毒性试验。结果表明,UV/H_2O_2处理的DEP的去除效率更高。DEP的降解反应动力学符合拟一级反应动力学模型。UV/H_2O_2体系中摩尔比值与去除率呈线性相关,而UV/TiO_2体系内则呈指数相关,但对应的UV/H_2O_2处理下K的拟合更好。Cl~-的存在对DEP在UV/H_2O_2条件下的降解有促进作用;相反,不利于DEP在UV/TiO_2条件下的降解。其他阴离子在两种处理中对DEP的降解都是不利的。Fe~(3+)的存在促进作用显著,所有其他阳离子均起到抑制作用。并且,HA对两种处理技术中都阻碍DEP降解。在UV/TiO_2处理DEP降解中间体比毒性小。
The The kinetics of diethyl phthalate(DEP) photodegradation by UV/H_2O_2 and UV/TiO_2 were studied.The DEP degradation fitted a pseudo-first-order kinetics pattern under experimental conditions.Multiple crucial factors effecting the clearance of DEP were investigated,including initial DEP concentration([DEP]_0),initial pH values(pH_0),UV light intensity,anions(Cl~-,NO~(3-),SO_4~(2-),HCO_3~-and CO_3~(2-)) and cations(Mg~(2+),Ca~(2+),Mn~(2+) and Fe~(3+)).The relationship between molar ratio([H_2O_2]/[DEP]or[TiO_2]/[DEP]) and degradation kinetic constant(K) was also studied.The K linearly related with molar ratio in UV/H_2O_2 system while nature exponential relationship was observed in the case of UV/TiO_2.The K also exhibited exponential trend as a function of initial DEP concentration under both experimental conditions.However,K fitted corresponding trends better in H_2O_2 system better than in TiO_2 system.The removal efficiency of UV/H_2O_2 systems is higher than UV/TiO_2.The cytotoxicity tests of DEP and its degradation intermediates in UV/H_2O_2 and UV/TiO_2 systems were researched.The UV/TiO_2 system was better than UV/H_2O_2 system in the degradation of toxic substance.

引文

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