UV活化高碘酸盐降解磺胺嘧啶的动力学及机制研究  

Kinetics and mechanism of sulfadiazine degradation by UV activated periodate

作　　者：丁语哲 蒋佳洪 邵彬彬 邓靖[1] DING Yuzhe;JIANG Jiahong;SHAO Binbin;DENG Jing(College of Civil Engineering and Architecture,Zhejiang University of Technology,Hangzhou 310014)

机构地区：[1]浙江工业大学土木工程学院,杭州310014

出　　处：《环境科学学报》2024年第11期147-154,共8页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.51978618,22106120)。

摘　　要：研究了紫外光(UV)活化高碘酸盐(PI)高级氧化体系降解磺胺嘧啶(SDZ)的动力学和降解机制.考察了不同工艺参数(pH、PI投加量)与共存阴离子(氯离子、碳酸根离子、硝酸根离子)对SDZ降解效能的影响.结果表明,UV/PI体系对SDZ的去除率随着PI投加量的增加而提高,在PI投加量为0.1 mmol·L^(-1)时,UV/PI体系可在30 min内降解96.5%的SDZ(6.0μmol·L^(-1)),降解过程遵循假一级动力学,速率常数为0.11 min^(-1).在初始pH值为3.0~9.0范围内,UV/PI体系均可降解SDZ,其中,在初始pH值为7.0时,SDZ的去除率最高.采用活性物质淬灭实验发现,UV/PI体系降解SDZ的主要活性物质为O_(3)、HO·、IO_(3)·、IO_(4)·.天然水体中常见阴离子对SDZ去除动力学的影响较小.此外,探究了UV/PI体系降解SDZ的中间产物并提出了可能的降解途径.The kinetics and mechanism of sulfamethoxazole(SDZ)degradation in the UV-activated periodate(PI)advanced oxidation system were investigated.The influence of different reaction parameters(pH,PI dosage)and coexisting anions on the SDZ degradation efficiency was examined.The results showed that the removal efficiency of SDZ by the UV/PI system increased with increasing PI dosage.In the presence of 0.1 mmol·L^(-1)PI,96.5%of SDZ(6.0μmol·L^(-1))was degraded in the UV/PI system within 30 min;the SDZ degradation followed the pseudo-first-order kinetics with a rate of 0.11 min^(-1) obtained.The UV/PI system could degrade SDZ within a wide pH range between 3.0 and 9.0,with the highest removal rate observed at an initial pH of 7.0.Quenching experiments revealed that the main reactive species responsible for the SDZ degradation in the UV/PI system were O_(3),HO·,IO_(3)·,and IO_(4)·.Common anions in natural water(including chloride ions,carbonate ions,nitrate ions)had a minimal impact on the degradation of SDZ.Furthermore,the degradation products of SDZ in the UV/PI system were explored,and the possible degradation pathways were proposed.

关 键 词：UV 高碘酸盐 磺胺嘧啶 活性氧化物种 降解 

分 类 号：X703[环境科学与工程—环境工程]