紫外光协同磁性离子交换树脂活化过硫酸盐去除水中腐殖酸的效能与机理
Removal performance and mechanism of humic acid by persulfate activated with ultraviolet light combined with magnetic ion exchange resin
武文龙 1高俣辰 2张晋玮 2李凌 2李燕 3曾宇晨 2杨春 2陆嘉鹏 2丁磊3
作者信息
- 1. 安徽工业大学能源与环境学院,安徽马鞍山 243002
- 2. 安徽工业大学建筑工程学院,安徽马鞍山 243002
- 3. 安徽工业大学建筑工程学院,安徽马鞍山 243002;安徽工业大学生物膜法水质净化及利用技术教育部工程研究中心,安徽马鞍山 243002
- 折叠
摘要
采用紫外光协同磁性离子交换树脂活化过硫酸盐去除水中腐殖酸,探究了紫外光/过硫酸盐/磁性离子交换树脂(UV/PMS/MIEX)体系对水中腐殖酸的去除效能、影响腐殖酸去除的环境因素、活性氧化物质产生机理及腐殖酸去除机理.UV/PMS/MIEX体系对水中腐殖酸具有显著的去除效能,反应120 min后去除率可达91.71％.树脂投加量和温度的提高可促进腐殖酸的去除,一定程度上增加PMS浓度可提升腐殖酸的去除效率,而溶液pH对腐殖酸去除的影响不明显.该体系以氧化过程为主,在树脂表面的铁氧化物,含氧官能团及外加紫外光等多种协同作用下,可有效活化过硫酸盐产生·OH,SO4·-,O2·-和1O2等多种活性氧化物质,自由基与非自由基途径共同协作降解腐殖酸.MIEX树脂体现出良好的重复使用性能,同时对于体系中的各类副产物可有效吸附去除.本研究为去除水中腐殖酸提供了一种新方法,所构建的氧化体系表现出良好应用前景.
Abstract
Humic acid(HA)in water was removed by activating persulfate with ultraviolet light combined with magnetic ion exchange resin.The removal efficiency of HA,the environmental factors affecting the removal of HA,the generation mechanism of active oxidizing species and the removal mechanism of HA in the ultraviolet light/persulfate/magnetic ion exchange resin(UV/PMS/MIEX)system were explored.The UV/PMS/MIEX synergistic system had a significant removal efficiency for HA in water,and the removal efficiency reached 91.71％after 120 minutes of reaction.The increase in resin dosage and temperature promoted HA removal,and increasing the concentration of persulfate could improve the removal efficiency of HA to a certain extent,but the effect of solution pH on the removal of HA was not obvious.In this system,the removal of HA was mainly through oxidation,and the adsorption effect WAs not significant.The iron oxides on the surface of the resin,the oxygen-containing functional groups and the addition of ultraviolet rays could effectively activate persulfate to produce various active oxidizing species such as·OH,SO4·-,O2·-,and 1O2.In this system,HA fractions were degraded by the radical and non-radical pathways,and the activation mainly occurs through the radical pathway.Based on the characterization of N2 adsorption-desorption isotherms,Fourier transform infrared spectroscopy,X-ray diffraction spectroscopy,and X-ray photoelectron spectroscopy before and after the reaction,it can be found that the magnetic ion exchange resin exhibits good reusability and stability,and can effectively adsorb and remove various by-products in the system.This study provides a new method for HA removal in water,and the constructed oxidation system shows a good application prospect.
关键词
紫外光/过硫酸盐/磁性离子交换树脂/腐殖酸/高级氧化Key words
ultraviolet light/persulfate/magnetic ion exchange resin/humic acid/advanced oxidation引用本文复制引用
基金项目
安徽省高等学校自然科学研究重点项目(2022AH050338)
国家级大学生创新创业训练计划(202210360043)
出版年
2024
NETL
NSTL
万方数据