紫外光光降解水中的三溴苯酚研究  

Research on Photo-degradation of Tribromophenol in Aqueous Phase by Ultraviolet

作　　者：顾雍[1] 孙贤波[1] 刘勇弟[1] 

机构地区：[1]华东理工大学资源与环境工程学院,国家环境保护化工过程环境风险评价与控制重点实验室,上海200237

出　　处：《化学世界》2016年第11期718-722,共5页Chemical World

摘　　要：三溴苯酚作为典型的溴代阻燃剂对环境具有危害且具有生物毒性,光解脱溴可以降低三溴苯酚的毒性。采用紫外光光解处理三溴苯酚,考察了pH值、初始浓度、温度、溶解氧、苯酚对三溴苯酚紫外光解和脱溴的影响。实验结果表明,光解过程符合拟一级动力学过程,三溴苯酚的光解速率常数随着pH值的升高而增大,与不同pH值条件下三溴苯酚的紫外吸收规律相一致;三溴苯酚光解速率随初始浓度的增大而减小,表明光解过程中间产物会竞争吸收光子;三溴苯酚光解速率随温度升高而增大,表明光解过程可能伴随着次级光化学反应。苯酚的存在对于三溴苯酚的紫外光光解形成了竞争吸收的作用。溶解氧的大小并不影响三溴苯酚紫外光解和脱溴表明由^1O_2引起的自敏化光解作用非常弱。Tribromophenol（TBP）as a typical brominated flame retardant is harmful to environment and has biological toxicity.Debromination by photo-degradation can reduce the toxicity of TBP.Photo-degradation of tribromophenol by Ultraviolet was investigated.The effects of pH value,initial concentration of tribromophenol,temperature,oxygen concentration,dosage of phenol were evaluated.The results showed that the photo-degradation process fitted the pseudo-first-order reaction kinetics.Meanwhile,the photolysis rate constant increased with the increase of pH value,coinciding with the ultraviolet absorption of tribromophenol;the photolysis rate constant decreased with the increase of initial concentration,indicating the simultaneous absorption of photoproducts;and the photolysis rate constant increased with the increase of temperature,showing the possible existence of secondary photochemical reaction.Phenol inhibited the photo-degradation process of tribromophenol by simultaneous absorption.The concentration of oxygen did not influence the photo-degradation and debromination of tribromophenol which proved that reactive oxygen specie ^1 O_2 did not work.

关 键 词：三溴苯酚 紫外光解 活性氧自由基 

分 类 号：R610.10[医药卫生—外科学]