UV/Cu(Ⅱ)/亚硫酸盐自氧化工艺去除水中典型新污染物布洛芬  

Degradation of Typical Emerging Contaminant Ibuprofen in Water by UV/Cu(Ⅱ)/Sulfite Auto-Oxidation Process

作　　者：林常春 徐栋[2] 王昕[3] 邓靖[3] LIN Changchun;XU Dong;WANG Xin;DENG Jing(Zhejiang University of Technology Engineering Design Group Co.,Ltd.,Hangzhou 310014,China;College of Environmental Science and Engineering,Zhejiang University of Water Resources and Electric Power,Hangzhou 310018,China;School of Civil Engineering,Zhejiang University of Technology,Hangzhou 310000,China)

机构地区：[1]浙江工业大学工程设计集团有限公司,浙江杭州310014 [2]浙江水利水电学院环境科学与工程学院,浙江杭州310018 [3]浙江工业大学土木工程学院,浙江杭州310000

出　　处：《净水技术》2025年第4期81-87,共7页Water Purification Technology

基　　金：国家自然科学基金(51978618);浙江省自然科学基金(LZ24E080005,LY21E080018);浙江省自然科学基金联合基金(LZJWZ23E080001)。

摘　　要：【目的】全球城市化进程加速与工业活动密集化的背景下,新污染物在水环境中的残留及迁移转化规律已成为水处理领域的研究焦点。因其在污水处理厂中的不完全去除及环境持久性,已在全球地表水中广泛检出,亟需开发兼具高效降解能力与环境相容性的新型水处理工艺。【方法】文章研究了紫外(UV)/Cu(Ⅱ)/亚硫酸盐自氧化工艺对水中典型新污染物布洛芬(IBP)的降解规律,探讨了溶液pH、亚硫酸盐与Cu(Ⅱ)用量对IBP降解的影响,分析了不同自由基的作用机制,提出了IBP可能的降解途径。【结果】结果表明,UV/Cu(Ⅱ)/亚硫酸盐自氧化工艺对IBP的降解符合准一级动力学模型,Cu(Ⅱ)有效促进了UV/亚硫酸盐工艺对IBP的降解,降解速率常数由0.04764 min^(-1)增加至0.13051 min^(-1),同时亚硫酸盐分解速率提升。IBP的降解速率与亚硫酸盐浓度呈正相关,弱碱性pH值(8.0)以及较低浓度(5μmol/L)Cu(Ⅱ)均有利于降解。硫酸根自由基(SO_(4)^(·-))是降解IBP主要的活性自由基,贡献率高达51.64%,而羟基自由基(·OH)的贡献率仅为15.45%。【结论】CuOH^(+)与亚硫酸盐络合协同UV活化亚硫酸盐,导致更多的SO_(4)^(·-)和·OH产生,加速了IBP降解。在UV/Cu(Ⅱ)/亚硫酸盐自氧化工艺中,共检出13种IBP的降解产物,由此提出了4种可能的转化途径,包括羟基化、脱羧化、羰基化和脱甲基化反应。[Objective]Under the background of the acceleration of global urbanization and the intensification of industrial activities,the law of residual,migration and transformation of emerging pollutants in water environment has become the focus of research in the field of water treatment.Due to its incomplete removal in wastewater treatment plants and environmental persistence,it has been widely detected in surface water worldwide,and there is an urgent need to develop new water treatment processes with both efficient degradation capacity and environmental compatibility.[Methods]In this paper,the degradation of ibuprofen(IBP)by UV/Cu(Ⅱ)/sulfite auto-oxidation process was investigated.The effects of pH,sulfite and Cu(Ⅱ)dosage on the degradation of IBP were evaluated.[Results]The mechanisms of different free radicals were explored,and the possible degradation pathways of IBP were proposed.The result demonstrated that the degradation of IBP by UV/Cu(Ⅱ)/sulfite auto-oxidation process was in accordance with the pseudo-first order kinetic model.Cu(Ⅱ)effectively facilitated IBP degradation in UV/sulfite process,and the degradation rate constant of IBP increased from 0.04764 min^(-1) to 0.13051 min^(-1),while the sulfite decomposition rate increased.The degradation rate of IBP was positively correlated with the concentration of sulfite,and weak alkaline pH value(8.0)and low concentration(5μmol/L)of Cu(Ⅱ)were found to be conducive to the degradation.Sulfate radical(SO_(4)^(·-))served as the primary active radical responsible for IBP degradation,with the contribution rate of 51.64%,and hydroxyl radical(·OH)only contributed 15.45%.[Condusion]Synergistic sulfite activation by UV irradiation and CuOH+complexes produced more SO_(4)^(·-) and·OH,accelerating IBP degradation.In the UV/Cu(Ⅱ)/sulfite auto-oxidation process,a total of 13 degradation products of IBP were detected,which suggested 4 possible transformation pathways,including hydroxylation,decarboxylation,carbonylation and demethylation.

关 键 词：紫外(UV) 亚硫酸盐 二价铜离子 自氧化工艺 布洛芬 

分 类 号：X703[环境科学与工程—环境工程]