紫外光协同TiCl_4去除水中As(Ⅲ)效能及动力学

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英文篇名：Efficiency and Reaction Kinetics for Arsenic Removal from Aqueous Solutions Using UV Combined TiCl_4 Process 作者：郭乐 ; 王玉霞 ; 刘玉灿 ; 李伟 ; 段晋明 英文作者：GUO Le;WANG Yuxia;LIU Yucan;LI Wei;DUAN Jinming;School of Environmental & Municipal Engineering,Xi'an University of Architecture and Technology;School of Environmental & Municipal Engineering, North China University of Water Resources and Electric Power;School of Civil Engineering, Yantai University; 关键词：As(Ⅲ) ; UV光催化氧化 ; TiCl_4 ; 氧化吸附速率常数 ; 吸附速率常数 英文关键词：Arsenite;;UV photo-catalytic oxidation;;TiCl_4;;oxidation rate constant;;adsorption rate constant 中文刊名：水处理技术 英文刊名：Technology of Water Treatment 机构：西安建筑科技大学环境与市政工程学院;华北水利水电大学环境与市政工程学院;烟台大学土木工程学院; 出版日期：2019-01-04 16:23 出版单位：水处理技术 年：2019 期：01 基金：陕西省教育厅专项科研计划项目(6040516034) 语种：中文; 页：75-79 页数：5 CN：33-1127/P ISSN：1000-3770 分类号：X703

摘要

在UV辐照射条件下,研究了钛盐混凝剂(TiCl_4)同步光催化氧化-混凝对水中As(Ⅲ)的去除效率及动力学特征。结果表明,TiCl_4对As(Ⅲ)的去除率在等电点附近(pH=5)达到最大,单一TiCl_4对As(Ⅲ)的去除率为73%;而增加UV辐照后,其去除效率增加至99%。UV/TiCl_4将As(Ⅲ)氧化为更易被絮体吸附的As(V)是去除率增加的主要原因。As(Ⅲ)的氧化吸附速率符合1级反应动力学模型,在pH=5～7内,其速率常数kO呈现出先增加后减小的变化趋势,在pH=6时达到最大(k_O=1.00 min~(-1));溶液中总砷(As(Ⅲ)+As(V))的吸附速率也符合1级动力学模型,且速率常数在pH=5～7内随pH的增加而增大,最大可达2.27 min~(-1)。
        Efficiency and reaction kinetics for arsenic removal from aqueous through synchronous photocatalytic oxidation-coagulation by TiCl_4 under UV irradiation were studied. The results showed that the maxnium removal effiency of As(Ⅲ) was 73% at pH=5 by single TiCl_4 without UV irradiation,however the the removal effiency of As(Ⅲ) was increased to 99% by the UV/TiCl4, the main reason was As(Ⅲ) was oxidated to As(V) which was easy to adsorption. The oxidation adsorption rate of As(Ⅲ) followed the first-order kinetics model. The oxidation rate constant first increased and then decreased with p H from 5 to 7, and had a maximum(1.00 min~(-1)) at p H=6. Adsorption rate of total arsenic from solutions also followed the first-order kinetics model,and the adsorption rate constant increased with the increase of pH in the range of 5 to 7, and had a maximum(2.27 min~(-1)) at p H was 7.

引文

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