单独用过一硫酸盐(PMS)处理受典型胃药雷尼替丁(RAN)污染的水体，研究了不同氧化剂、污染物初始浓度、PMS浓度、初始pH、腐殖酸以及共存阴离子浓度对RAN降解效率的影响，通过萝卜种子发芽实验，评估了反应后溶液的生物毒性。结果表明，浓度10 mg/L的50 mL RAN溶液，最佳PMS投加量为0。5 mmol/L。中性条件下，在30 min内可以降解93。49％的RAN，而其他氧化剂(如过氧化氢、过硫酸盐)对RAN的去除效果不佳。酸性、中性甚至弱碱性条件时，单独PMS体系对RAN具有类似的降解效果，在强碱性条件下(pH=11)，PMS对RAN的降解活性被显著抑制。低浓度Cl-的存在，提高了 RAN的降解效率，而SO42-、NO3-、CO32-和腐植酸(HA)则阻碍了RAN的去除。自由基淬灭和捕获实验显示，单线态氧是负责催化RAN降解的主要活性氧物种。萝卜种子发芽实验发现，处理液有利于萝卜茎长的增加，表明PMS氧化过程降低了 RAN的毒性。
Peroxymonosulfate remediation of Ranitidine contaminated water bodies:Performance,mechanism and toxicity evolution
The water contaminated with the typical gastric drug Ranitidine(RAN)was treated via peroxom-onosulfate(PMS)alone.The effects of different oxidants,initial pollutant concentration,PMS concentration,initial pH,humic acid,and co-existing anion concentration on the degradation efficiency of RAN were inves-tigated.The results showed that 0.5 mmol/L PMS under neutral conditions degraded 93.49％of RAN(10 mg/L)within 30 min,while other oxidants(i.e.hydrogen peroxide H2O2,persulfate PS)were not ef-fective in removing RAN.Moreover,the degradation of RAN by PMS was significantly inhibited under strongly alkaline conditions(pH=11).The presence of low concentrations of Cl-enhanced the degradation efficiency of RAN,while SO42-,NO3-,CO32-and humic acid(HA)hindered the RAN removal process.Reac-tive oxygen species quenching and trapping experiments revealed that singlet oxygen was the main reactive oxygen species responsible for catalyzing RAN degradation.In addition,germination and stem length increased in wheat and radish,indicating that the PMS oxidation process reduced the toxicity of RAN.
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