Na_(2)SO_(3)强化K_(2)FeO_(4)降解有机锡的效能及机制研究  

Study on efficiency and mechanism of Na_(2)SO_(3) enhanced K_(2)FeO_(4) degradation of organotin

作　　者：蒋晖[1] 冉洪杰 林于廉 黄媛媛 JIANG Hui;RAN Hongjie;LIN Yulian;HUANG Yuanyuan(School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Municipal Engineering,Chongqing Water Resources and Electric Engineering College,Chongqing 402160,China;Chongqing Academy of Science and Technology,Chongqing 401123,China)

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]重庆水利电力职业技术学院市政工程学院,重庆402160 [3]重庆市科学技术研究院,重庆401123

出　　处：《华中科技大学学报（自然科学版）》2024年第10期142-148,共7页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：重庆市水利科技项目(CQSCK-2023013,CQSLK-2022001);重庆市技术创新与应用发展专项资助项目(CSTB2022TIAD-KPX0133);重庆市教育委员会科学技术研究项目(KJZD-K202103801);重庆市2023年度城市管理科研科普项目(2023年第16号);水利部重大科技项目(SKS-2022076)。

摘　　要：为有效去除水体环境中的有机锡污染物,以三丁基锡(TBT)和三苯基锡(TPhT)为目标污染物,探究亚硫酸钠(Na_(2)SO_(3))强化高铁酸钾(K_(2)FeO_(4))对TBT和TPhT的降解效能和去除机制.结果表明:当pH=8,Na_(2)SO_(3)和K_(2)FeO_(4)投加质量浓度分别为40 mg/L和300 mg/L时,TBT和TPhT的去除效果最佳,比单独投加K_(2)FeO_(4)分别提高26.34%和22.16%;在无氧条件下去除效果均低于有氧条件.采用叔丁醇、乙醇和甲基苯基亚砜对氧化活性物种的鉴别可知:对TBT和TPhT降解的主要氧化活性物种为Fe(Ⅴ),硫酸根自由基(SO_(4)^(·-))和羟基自由基(·OH)在一定程度上可以降解TBT和TPhT.通过气相色谱-质谱联用仪(GC-MS)的检测,证实生成的氧化活性物种通过攻击Sn-C键而逐步去丁基或苯基的过程,TBT和TPhT最终被氧化为无机锡离子.To effectively remove organotin pollutants from aquatic environments,tributyltin(TBT) and triphenyltin(TPhT) were targeted as pollutants,and the degradation efficiency and removal mechanism of sodium sulfite(Na_(2)SO_(3)) enhanced potassium ferrate(K_(2)FeO_(4)) for TBT and TPhT were investigated.Results show that the optimal removal efficiency for TBT and TPhT is achieved at pH of 8,with Na_(2)SO_(3) and K_(2)FeO_(4) dosages of 40 mg/L and 300 mg/L,respectively,improving by 26.34% and 22.16% compared to the addition of K_(2)FeO_(4) alone.The removal efficiency under anoxic conditions is found to be lower than that under oxic conditions.The reactive oxidative species are identified using tert-butanol,ethanol,and methyl phenyl sulfoxide,and it is determined that the primary reactive oxidative species for TBT and TPhT degradation is Fe(Ⅴ),with sulfate radicals(SO_(4)^(·-)) and hydroxyl radicals(·OH)also contributing to the degradation to some extent.Gas chromatography-mass spectrometry(GC-MS) analysis confirms that the reactive oxidative species could degrade TBT and TPhT by attacking the Sn-C bond,gradually removing butyl or phenyl groups,and ultimately oxidizing TBT and TPhT to inorganic tin ions.

关 键 词：水环境 高铁酸钾 亚硫酸钠 三丁基锡 三苯基锡 

分 类 号：X52[环境科学与工程—环境工程]