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研究报告

H₂O₂/KI assisted photodegradation of sulfadiazine in aquoes solution under UVA irradiation

基金项目：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pH值、H₂O₂和KI添加浓度等对UVA/H₂O₂/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/H₂O₂/KI体系对磺胺嘧啶的降解作用显著.初始pH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,H₂O₂、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/H₂O₂/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.

Abstract：Photodegradation of sulfadiazine with hydrogen peroxide and iodide in aquoes solution (UVA/H₂O₂/KI) under UVA (λ=365 nm) irradiation was investigated, and the effect of initial pH, H₂O₂ 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^-1and 2.4 mmol·L^-1, respectively. Iodine radicals (I₂^-·, I·) were the main active substances in the UVA/H₂O₂/KI system. HPLC analysis results indicated that three main intermediate substances were produced during sulfadiazine removal in the system, one of them may be sulfanilic amide.