NO_(2)^(−)对高铁酸盐降解水中4-氯-3,5-二甲基苯酚的影响  

Kinetic and mechanistic effects of NO_(2)^(−)on the degradation of 4-chloro-3,5-dimethylphenol in water by ferrate

作　　者：卢颖 姚滨斌 杨培增 季跃飞 陈静[1] 陆隽鹤[1] LU Ying;YAO Bin-bin;YANG Pei-zeng;JI Yue-fei;CHEN Jing;LU Jun-he(Department of Environmental Science and Engineering,Nanjing Agricultural University,Nanjing 210095,China)

机构地区：[1]南京农业大学环境科学与工程系,江苏南京210095

出　　处：《中国环境科学》2024年第10期5522-5529,共8页China Environmental Science

基　　金：中国博士后科学基金(2022M721634);江苏省创新创业博士项目(JSSCBS20210264);污染控制与资源再利用国家重点实验室开放基金(PCRRF21020)。

摘　　要：探讨NO_(2)^(−)对高铁酸盐(Fe(Ⅵ))降解4-氯-3,5-二甲基苯酚(PCMX)的动力学、产物和毒性的影响.结果表明,在pH7~9范围内,Fe(Ⅵ)能有效降解水中的PCMX,在[Fe(Ⅵ)]:[PCMX]=10:1的条件下,PCMX在5min内的降解率可达100%.0.1~10mg/L的腐殖酸(HA)明显促进了PCMX的降解;而NO_(2)^(−)的引入则显著抑制了反应过程,并导致多种硝基副产物的生成.淬灭实验结果表明,高价铁是反应过程中的主要反应物种.毒性预测显示,生成的硝基副产物和偶联产物具有持久性和生物毒性,如OP-6和OP-7的半衰期超过180d,生物富集因子大于5000,慢性毒性值小于1mg/L,可能带来一定的环境风险.We investigated the impact of NO_(2)^(−)on degradation efficiency,products,and toxicity of 4-chloro-3,5-dimethylphenol(PCMX)during ferrate(Fe(Ⅵ))oxidation.Results demonstrated that Fe(Ⅵ)effectively degraded PCMX in water within the pH range of 7~9,achieving a 100%removal in 5minutes with a[Fe(Ⅵ)]:[PCMX]ratio of 10:1.The presence of 0.1~10mg/L humic acid(HA)significantly enhanced PCMX degradation.The addition of NO_(2)^(−) inhibited the reaction,and resulted in the formation of various nitrated byproducts.Quenching experiments indicated that high-valent iron species play a key role in this process.Toxicity assessment suggested that these nitrated byproducts and coupling products exhibited prolonged persistence and biotoxicity.For example,OP-6 and OP-7 have half-lives exceeding 180 days,bioaccumulation factors greater than 5000,and chronic toxicity values less than 1mg/L,which may pose certain environmental risks.

关 键 词：高铁酸盐 4-氯-3 5-二甲基苯酚 硝基副产物 理论计算 影响 

分 类 号：X703[环境科学与工程—环境工程]