Citation: Haoting Wang, Mengfan Luo, Yuzhong Wang, Jialong Yin, Heng Zhang, Jia Zhao, Bo Lai. Mn(Ⅱ) enhanced permanganate oxidation of trace organic pollutants in water: Critical role of in situ formation of colloidal MnO₂[J]. Chinese Chemical Letters, ;2025, 36(6): 110348. doi: 10.1016/j.cclet.2024.110348 shu

Mn(Ⅱ) enhanced permanganate oxidation of trace organic pollutants in water: Critical role of in situ formation of colloidal MnO₂

Haoting Wang ^{a, b} ,
Mengfan Luo ^{a, b} ,
Yuzhong Wang ^c ,
Jialong Yin ^{a, b} ,
Heng Zhang ^{a, b, *,} ,
Jia Zhao ^{a, b} ,
Bo Lai ^{a, b, d}

a.
State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
b.
Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China
c.
Downhole Technology Service Company, Bohai Drilling Engineering Company, Ltd., CNPC, Tianjin 300283, China
d.
Key Laboratory of Jiangxi Province for Persistent Pollutants Prevention Control and Resource Reuse, Nanchang Hangkong University, Nanchang 330063, China

zhangheng01@scu.edu.cn

Received Date: 6 July 2024
Revised Date: 15 August 2024
Accepted Date: 16 August 2024
Available Online: 17 August 2024

Figures(4)

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 20 µmol/L Mn(Ⅱ) at pH 5.0 accelerated trace organic pollutant removal by promoting colloidal MnO₂ formation. UV−vis spectrum, quenching, and probe experiments confirmed role of MnO₂ in sulfamethoxazole (SMX) oxidation, with Mn(Ⅲ) playing a predominant role. Meanwhile, in situ-generated MnO₂ 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.
- Permanganate,
- Mn(Ⅱ),
- Sulfamethoxazole,
- MnO₂,
- Autocatalysis
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沈阳化工大学材料科学与工程学院沈阳 110142

Mn(Ⅱ) enhanced permanganate oxidation of trace organic pollutants in water: Critical role of in situ formation of colloidal MnO2

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通讯作者: 陈斌, bchen63@163.com

Mn(Ⅱ) enhanced permanganate oxidation of trace organic pollutants in water: Critical role of in situ formation of colloidal MnO₂