###
工程科学与技术:2021,53(6):211-218
←前一篇   |   后一篇→
本文二维码信息
码上扫一扫!
光还原铁离子活化过硫酸盐系统去除水中碘海醇
(1.贵阳学院 生物与环境工程学院,贵州 贵阳 550005;2.同济大学 污染控制与资源化研究国家重点实验室,上海 200092;3.长江水环境教育部重点实验室,上海 200092)
Removal of Iohexol in Aqueous Solution by Photoreduction–Fe(Ⅲ) Activated Persulfate System
(1.College of Biology and Environment Eng., Guiyang Univ., Guiyang 550005, China;2.State Key Lab. of Pollution Control and Resource Reuse, Tongji Univ., Shanghai 200092, China;3.Key Lab. of Yangtze Aquatic Environment, Ministry of Education, Shanghai 200092, China)
摘要
图/表
参考文献
相似文献
本文已被:浏览 543次   下载 254
投稿时间:2021-01-10    修订日期:2021-04-13
中文摘要: 过渡金属Fe2+是最经济有效且环境友好的PS活化物质,但是Fe2+易于被氧化而失去活化能力以致Fe2+/PS体系持续效果较差。为了提高Fe2+活化PS氧化降解有机污染物的效率,将碘化X射线显影剂(ICM)的典型代表碘海醇(iohexol)作为目标污染物,研究其在UV/PS、Fe(C2O4)3 3–/PS、UV/Fe(C2O4)3 3–/PS和Fe2+/PS 这4种高级氧化体系中的降解,考查Fe(C2O4)3 3–浓度、紫外光强和pH对UV/Fe(C2O4)3 3–/PS体系中碘海醇降解和PS活化分解的影响,并分析体系中Fe2+浓度变化及其转化率。结果表明:4种高级氧化体系中,碘海醇的氧化分解率分别为83.8%、7.0%、98.8%、69.9%,其中,UV/Fe(C2O4)3 3–/PS体系能够通过紫外光促进铁离子还原,溶液中对PS起活化作用的Fe2+逐渐释出,对碘海醇的降解最为高效彻底。随着Fe(C2O4)3 3–浓度的增加,UV/Fe(C2O4)3 3–/PS体系中PS的分解率不断增加,而碘海醇的降解率却先增加后减少。Fe(C2O4)3 3–4种不同初始浓度下(20、50、100、200 μmol/L),碘海醇降解速率依次为100>200>50>20 μmol/L。在UV/Fe(C2O4)3 3–/PS体系中,Fe2+浓度均是先快速增加后缓慢下降,碘海醇的降解率、PS的分解率以及Fe2+的最高转化率均与光强正相关,与pH负相关。因此,利用紫外光还原铁离子能够极大地提高Fe2+活化PS效率,且体系对于光强、pH等影响因素有较强的适应能力,在水处理高级氧化领域的具有较大的应用前景。
Abstract:Transition metal Fe2+ is the most economical, effective and environmentally friendly PS activation substance, but Fe2+ is prone to be oxidized and loses its activation ability, resulting in poor continuous effect of the Fe2+/PS system. In order to improve the efficiency of the Fe2+/PS system in oxidizing and degrading organic pollutants, iohexol, a commonly used iodinated X–ray contrast media in medical field, was taken as the target pollutant,and its degradation in four advanced oxidation proeesses such as UV/PS,Fe(C2O4)3 3–/PS,UV/Fe(C2O4)3 3–/PS and Fe2+/PS was studid. The effects of Fe(C2O4)3 3– concentration, ultraviolet light intensity and pH on the degradation of iohexol and PS decomposition in UV/Fe(C2O4)3 3–/PS system were examined, and then the Fe2+ concentration change and its conversion rate in the system were analyzed. The results verified that the oxidation decomposition rates of iohexol in the four advanced oxidation systems were 83.8%, 7.0%, 98.8%, and 69.9% respectively, among which the UV/Fe(C2O4)3 3–/PS system could promote the reduction of ferrous irons through ultraviolet light, Fe2+ that activates PS in the solution was gradually released, and the degradation of iohexol was the most efficient and complete. As the concentration of Fe(C2O4)3 3– increased, the decomposition rate of PS in the UV/Fe(C2O4)3 3–/PS system increased, while the degradation rate of iohexol first increases and then decreases. Under four different initial Fe(C2O4)3 3– concentrations (20, 50, 100, 200 μmol/L), the degradation rate of iohexol is in the order of 100>200>50>20 μmol/L. In the UV/Fe(C2O4)3 3–/PS system, the Fe2+ concentration first increases rapidly and then slowly decreases, the degradation rate of iohexol, the decomposition rate of PS and the highest conversion rate of Fe2+ are all positively correlated with ultraviolet light intensity and negatively correlated with pH. Therefore, the use of ultraviolet light to reduce iron ions can greatly improve the Fe2+ activation efficiency, and the system has strong adaptability to influencing factors such as light intensity and pH, and has great application prospects in the field of advanced oxidation in water treatment.
文章编号:202100110     中图分类号:X703    文献标志码:
基金项目:水体污染控制与治理科技重大专项(2017ZX07207004);贵州省教育厅青年科技人才成长项目(黔教合KY字[2018]295);贵阳学院专项科研资金[GYU–KYZ–(2022)]
作者简介:第一作者:李冕(1987-),女,博士生,副教授.研究方向:水处理技术.E-mail:limian198772@163.com;通信作者:徐斌,E-mail:tjwenwu@tongji.edu.cn
引用文本:
李冕,张天阳,杨丹,叶婷,徐斌.光还原铁离子活化过硫酸盐系统去除水中碘海醇[J].工程科学与技术,2021,53(6):211-218.
LI Mian,ZHANG Tianyang,YANG Dan,YE Ting,XU Bin.Removal of Iohexol in Aqueous Solution by Photoreduction–Fe(Ⅲ) Activated Persulfate System[J].Advanced Engineering Sciences,2021,53(6):211-218.