紫外光解水中苯妥英钠的效能及机理研究  

Efficiency and Mechanism of Ultraviolet Photolysis of Phenytoin Sodium in Aqueous Solution

作　　者：易文宇 宋喆 王晶文 王宗平[1] 谢鹏超[1] 岳思阳 YI Wenyu;SONG Zhe;WANG Jingwen;WANG Zongping;XIE Pengchao;YUE Siyang(School of Environmental Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;China Railway First Survey And Design Institude Group Co.,Ltd,Xian 710043,China;School of Architecture&Urban Planning,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学环境科学与工程学院,湖北武汉430074 [2]中铁第一勘察设计院集团有限公司,陕西西安710043 [3]华中科技大学建筑与城市规划学院,湖北武汉430074

出　　处：《水处理技术》2022年第1期54-58,共5页Technology of Water Treatment

基　　金：国家自然科学基金(51578259);高校特色创新类项目(2016KTSCX035)。

摘　　要：研究了紫外(UV)在不同条件下光解苯妥英钠(DPH)的效能。结果表明,在DPH浓度为20μmol/L,pH为7.0,反应温度为25℃,辐射光强为0.31μE/s的条件下,DPH在UV辐照90 min后的去除率可达85.4%,在该条件下DPH的量子产率为0.664 mol/E。溶液pH及腐殖酸(HA)对UV体系下DPH的降解效能影响显著,pH升高及HA的存在均会抑制UV体系下DPH的降解效能;温度和无机阴离子(Cl^(-)、NO_(3)^(-)和HCO_(3)^(-))对降解效能的影响较小。高效液相色谱-质谱联用仪检出6种中间产物,说明DPH的UV直接光解路径主要为氮杂环的断键开环。Ultraviolet photolysis of phenytion(DPH)was systemically studied.After UV irradiation(intensity 0.31μE/s)for 90 min at pH 7.0,the removal of DPH reached to 85.4%with an initial DPH concentration of 20μmol/L,and the corresponding quantum yield of DPH was 0.664 mol/E.Solution pH and the presence of HA were evidenced to significantly influence the DPH degradation under UV irradiation,along with the higher pH or HA concentrations decreasing DPH removal efficiencies.Whereas temperature and inorganic anions(e.g.,Cl^(-),NO_(3)^(-)and HCO_(3)^(-))had insignificant impacts on DPH degradation.Six intermediates were detected by LC-MS during UV photolysis of DPH,and the DPH degradation pathways mainly through the break of the N-heterocycle were proposed.

关 键 词：苯妥英钠 紫外光 直接光解 降解路径 

分 类 号：X703.1[环境科学与工程—环境工程]