Studies widely acknowledge the enhancement of permanganate(Mn(Ⅶ))oxidation of organic contaminants by coexisting matrices in water.This study investigated the positive influence of Mn(Ⅱ),a common soluble metal ion,o...Studies widely acknowledge the enhancement of permanganate(Mn(Ⅶ))oxidation of organic contaminants by coexisting matrices in water.This study investigated the positive influence of Mn(Ⅱ),a common soluble metal ion,on the removal of trace organic pollutants by Mn(Ⅶ).Results showed that introducing 20μmol/L Mn(Ⅱ)at pH 5.0 accelerated trace organic pollutant removal by promoting colloidal MnO_(2)formation.UV-vis spectrum,quenching,and probe experiments confirmed role of MnO_(2)in sulfamethoxazole(SMX)oxidation,with Mn(Ⅲ)playing a predominant role.Meanwhile,in situ-generated MnO_(2)facilitated Mn(Ⅶ)*formation,enhancing oxidation performance,as indicated by Raman spectroscopy and electrochemical analysis.Eleven transformation products(TPs)of SMX in the Mn(Ⅶ)/Mn(Ⅱ)process were detected by UPLC-QTOF-MS/MS.Subsequently,the reaction pathways of SMX were elucidated through Fukui index analysis and the identification of TPs.Additionally,toxicity simulations with Toxicity Estimation Software Tool(T.E.S.T.)software revealed significantly lower cytotoxicity of TPs of SMX compared to the parent compound.This study unveils an effective strategy to enhance Mn(Ⅶ)-mediated degradation of organic pollutants in water,elucidating Mn(Ⅱ)-induced Mn(Ⅶ)activation mechanisms.展开更多
基金support from the National Natural Science Foundation of China(Nos.52300102,523B2094)the Key Laboratory of Jiangxi Province for Persistent Pollutants Prevention Control and Resource Reuse(No.2023SSY02061)+1 种基金the Natural Science Foundation of Sichuan Province(No.2024NSFSC0130)Miaozi Project in Science and Technology Innovation Program of Sichuan Province(No.MZGC20230098)。
文摘Studies widely acknowledge the enhancement of permanganate(Mn(Ⅶ))oxidation of organic contaminants by coexisting matrices in water.This study investigated the positive influence of Mn(Ⅱ),a common soluble metal ion,on the removal of trace organic pollutants by Mn(Ⅶ).Results showed that introducing 20μmol/L Mn(Ⅱ)at pH 5.0 accelerated trace organic pollutant removal by promoting colloidal MnO_(2)formation.UV-vis spectrum,quenching,and probe experiments confirmed role of MnO_(2)in sulfamethoxazole(SMX)oxidation,with Mn(Ⅲ)playing a predominant role.Meanwhile,in situ-generated MnO_(2)facilitated Mn(Ⅶ)*formation,enhancing oxidation performance,as indicated by Raman spectroscopy and electrochemical analysis.Eleven transformation products(TPs)of SMX in the Mn(Ⅶ)/Mn(Ⅱ)process were detected by UPLC-QTOF-MS/MS.Subsequently,the reaction pathways of SMX were elucidated through Fukui index analysis and the identification of TPs.Additionally,toxicity simulations with Toxicity Estimation Software Tool(T.E.S.T.)software revealed significantly lower cytotoxicity of TPs of SMX compared to the parent compound.This study unveils an effective strategy to enhance Mn(Ⅶ)-mediated degradation of organic pollutants in water,elucidating Mn(Ⅱ)-induced Mn(Ⅶ)activation mechanisms.
