UVA紫外辐射下H2O2/KI降解水中磺胺嘧啶  

H_2O_2/KI assisted photodegradation of sulfadiazine in aquoes solution under UVA irradiation

作　　者：魏红[1] 杨小雨[1] 李克斌[2] 闵涛[3] 

机构地区：[1]西安理工大学,西北旱区生态水利工程国家重点实验室培育基地,西安710048 [2]西北大学化学与材料科学学院,合成与天然功能分子化学教育部重点实验室,西安710069 [3]西安理工大学理学院,西安710048

出　　处：《环境科学学报》2016年第5期1697-1703,共7页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.51409211);陕西省教育厅重点实验室项目(No.13JS067);陕西省水利科技项目(No.2013slkj-07);西安理工大学创新基金(No.106211302);环境工程国家重点学科培育学科项目(No.106-x12045)~~

摘　　要：研究了UVA(λ=365 nm)紫外辐射下碘与过氧化氢共存对水中磺胺嘧啶的降解.同时,考察了溶液初始p H值、H_2O_2和KI添加浓度等对UVA/H_2O_2/KI体系降解磺胺嘧啶的影响,并对体系中的主要活性物质进行了分析.结果表明,UVA/H_2O_2/KI体系对磺胺嘧啶的降解作用显著.初始p H值的影响较大.作为体系中碘及其自由基产生的关键因子,一定范围内,H_2O_2、KI的添加浓度增加,磺胺嘧啶的去除率增加,且存在适宜添加浓度,分别为120 mmol·L^(-1)和2.4 mmol·L^(-1).甲醇和甲硫咪唑的抑制实验结果表明,碘自由基为UVA/H_2O_2/KI体系降解磺胺嘧啶的主要活性物质.HPLC谱图显示,磺胺嘧啶在降解过程中主要有3种产物生成,其中之一可能为磺胺.Photodegradation of sulfadiazine with hydrogen peroxide and iodide in aquoes solution （ UVA/H202/KI） under UVA （ A = 365 nm） irradiation was investigated, and the effect of initial pH, H202 and KI, and main active components were inspected. The results showed that the synergistic effect of the UVA/H2O2/KI system on sulfadiazine degradation was significant, and the initial pH also had substantial impact. The degradation efficiency of sulfadiazine increased with the increasing of H2O2 or KI initial concentrations, and the optimal values were about 120 mmol· L-1 and 2.4 mmol·L-1, respectively. Iodine radicals （I-2 , I） were the main active substances in the UVA/H202/KI system. HPLC analysis results indicated that three main intermediate substances were produced during sulfadiazine removal in the system, one of them may be suffanilic amide.

关 键 词：碘 碘自由基 甲硫咪唑 UVA 磺胺嘧啶 

分 类 号：X703[环境科学与工程—环境工程]