羟基化锌催化臭氧氧化去除水中痕量磺胺嘧啶

摘要

ZnOOH prepared in laboratory was used as a catalyst in the ozonation of trace sulfadiazine (SD) in water.The catalytic mechanism was deduced base on the effect of radical inhibitor t-BuOH on the reaction.The influences of O3dose,water quality parameters (pH, chloride anion concentration), catalyst dose and catalyst reuse on the SD removal were also examined.ZnOOH had excellent catalytic activity in SD ozonation.The hydroxyl groups combined on the catalyst surfaces played a part in the catalytic reactions.The removal of SD dissolved in distilled water increased by 47.7％ at reaction time of 30min in ozonation with zinc hydroxide compared to the ozonation without catalyst under optimal conditions.The catalytic reaction process followed a hydroxyl radical reaction mechanism and the SD removal improved with increasing dosage of catalyst.ZnOOH can be reused for several times without obvious reduction of catalytic activity and Cl in water could greatly decrease the catalytic activity of ZnOOH.The optimal catalytic activity of ZnOOH achieved at weak basic solution.%以实验室制备的羟基化锌(ZnOOH)为催化剂,研究了其催化臭氧化去除水中痕量磺胺嘧啶(SD)的效能,通过研究叔丁醇对催化效果的影响,推断了催化反应机理,探讨了臭氧投加量、水质因素、催化剂投加量和使用次数对催化性能的影响因素.结果表明,ZnOOH对臭氧氧化水中的SD有较强的催化活性.催化剂表面结合的羟基基团有利于催化反应.在优化的实验条件下,蒸馏水中反应30min时,催化臭氧化比单独臭氧化对SD的去除率提高了47.7%.催化过程遵循自由基反应机理,SD的去除效果随催化剂投加量的增加而提高,催化剂在重复使用后催化效果基本不变,水中的氯离子可以明显降低催化剂的活性,偏碱性条件下,催化效果更佳.