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Insights into the electron transfer mechanisms of permanganate activation by carbon nanotube membrane for enhanced micropollutants degradation
Numerous reagents have been proposed as electron sacrificers to induce the decomposition of permanganate (KMnO4) by producing highly reactive Mn species for micropollutants degradation. However, this strategy can lead to low KMnO4 utilization efficiency due to limitations associated with poor mass transport and high energy consumption. In the present study, we rationally designed a catalytic carbon nanotube (CNT) membrane for KMnO4 activation toward enhanced degradation of micropollutants. The proposed flow-through system outperformed conventional batch reactor owing to the improved mass transfer via convection. Under optimal conditionals, a > 70% removal (equivalent to an oxidation flux of 2.43 mmol/(h·m2)) of 80 µmol/L sulfamethoxazole (SMX) solution can be achieved at single-pass mode. The experimental analysis and DFT studies verified that CNT could mediate direct electron transfer from organic molecules to KMnO4, resulting in a high utilization efficiency of KMnO4. Furthermore, the KMnO4/CNT system had outstanding reusability and CNT could maintain a long-lasting reactivity, which served as a green strategy for the remediation of micropollutants in a sustainable manner. This study provides new insights into the electron transfer mechanisms and unveils the advantages of effective KMnO4 utilization in the KMnO4/CNT system for environmental remediation.
Insights into the electron transfer mechanisms of permanganate activation by carbon nanotube membrane for enhanced micropollutants degradation
Numerous reagents have been proposed as electron sacrificers to induce the decomposition of permanganate (KMnO4) by producing highly reactive Mn species for micropollutants degradation. However, this strategy can lead to low KMnO4 utilization efficiency due to limitations associated with poor mass transport and high energy consumption. In the present study, we rationally designed a catalytic carbon nanotube (CNT) membrane for KMnO4 activation toward enhanced degradation of micropollutants. The proposed flow-through system outperformed conventional batch reactor owing to the improved mass transfer via convection. Under optimal conditionals, a > 70% removal (equivalent to an oxidation flux of 2.43 mmol/(h·m2)) of 80 µmol/L sulfamethoxazole (SMX) solution can be achieved at single-pass mode. The experimental analysis and DFT studies verified that CNT could mediate direct electron transfer from organic molecules to KMnO4, resulting in a high utilization efficiency of KMnO4. Furthermore, the KMnO4/CNT system had outstanding reusability and CNT could maintain a long-lasting reactivity, which served as a green strategy for the remediation of micropollutants in a sustainable manner. This study provides new insights into the electron transfer mechanisms and unveils the advantages of effective KMnO4 utilization in the KMnO4/CNT system for environmental remediation.
Insights into the electron transfer mechanisms of permanganate activation by carbon nanotube membrane for enhanced micropollutants degradation
Front. Environ. Sci. Eng.
Wang, Xufang (author) / Guo, Dongli (author) / Zhang, Jinna (author) / Yao, Yuan (author) / Liu, Yanbiao (author)
2023-09-01
Article (Journal)
Electronic Resource
English
| American Chemical Society | 2024
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| American Chemical Society | 2024
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