超声激发碘自由基降解水中磺胺嘧啶  

Sulfadiazine degradation through iodine radicals excited by ultrasound

作　　者：魏红[1] 杨小雨[1] 闵涛[1] 李克斌[2] 

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,陕西西安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,陕西西安710069

出　　处：《中国环境科学》2015年第11期3288-3295,共8页China Environmental Science

基　　金：陕西省教育厅科学研究计划项目(2013JK0881);陕西省教育厅重点实验室项目(13JS067);陕西省水利科技项目(2013slkj-07);西安理工大学创新基金(106211302);环境工程国家重点学科培育学科项目(106-x12045)

摘　　要：以H2O2和KI作为分子碘（I2）的来源,研究超声/H2O2/KI体系对磺胺嘧啶（SD）的降解效果.考察超声/H2O2/KI体系中溶液初始p H值、H2O2和KI添加浓度等因素的影响.采用碘自由基抑制剂甲硫咪唑对体系中的活性物质进行分析.结果表明,超声/H2O2/KI体系显著提高了磺胺嘧啶的降解效果,磺胺嘧啶的去除率随溶液初始p H值（2.6~5.2）的升高而降低;H2O2和KI的添加浓度对磺胺嘧啶的去除率影响较大,磺胺嘧啶的去除率随其初始浓度的增大而降低.碘自由基（I·和I2-·）是超声/H2O2/KI体系降解磺胺嘧啶的主要活性物质.HPLC图谱表明,磺胺嘧啶降解的同时生成4种产物,磺胺为降解产物之一.The ultra-degradation of sulfadiazine（Sulfadiazine, SD） enhanced by molecular iodine under ultrasound/ H2O2/KI system was investigated. The experimental parameters such as initial solution p H, KI and H2O2 adding concentration were discussed. The main active species in ultrasound/H2O2/KI system were evaluated by adding methimazole, the scavenger of iodine radicals. The experimental results indicated that SD degradation was enhanced significantly under the ultrasound/H2O2/KI system. The SD removal efficiency decreased with the initial p H value, and was influenced considerably by the concentration of H2O2 and KI. The radical inhibition experiments indicated that I· and I2-· were the main active species contributed to SD degradation. HPLC analysis showed that four intermediate products formed during SD degradation under ultrasound/H2O2/KI system, and one was sulfanilamide.

关 键 词：碘 碘自由基 超声 磺胺嘧啶 甲硫咪唑 

分 类 号：X52[环境科学与工程—环境工程]