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Electrified Nitrogen-Doped MXene Membrane Electrode for Micropollutants Decontamination via Peroxymonosulfate Activation
https://orcid.org/0000-0001-8404-3806
Advanced oxidation processes based on peroxymonosulfate (PMS) activation have attracted tremendous attention as a promising approach for removing micropollutants. Herein, we designed a nitrogen-doped Ti3C2T x MXene (N-Ti3C2T x ) electrocatalytic filtration system for the activation of PMS to efficiently and selectively degrade micropollutants. The system was configured for flow-through operation, which led to significant improvements in performance compared with a conventional batch reactor system because of the enhanced convective mass transfer. Specifically, a 90.8% removal of 0.04 mmol L–1 sulfamethoxazole (SMX) solution could be achieved in flow-through mode (k = 0.0173 ± 0.0003 min–1) within 120 min under optimal conditions. This value was 4.7-fold higher than the conventional batch mode (k = 0.0037 ± 0.0001 min–1). Radical quenching tests, electron paramagnetic resonance measurements, and electrochemical tests verified that SMX was degraded in the N-Ti3C2T x /PMS filtration system primarily via nonradical pathways. Density functional theory calculations demonstrated that doping of N changed the PMS activation pathway and enhanced the ability of the N-Ti3C2T x membrane electrode to transfer electrons. In the presence of inorganic anions or humic acids (15.0 mmol L–1), the SMX removal efficiency remained above 81.1%, illustrating that naturally occurring substances in water did not interfere with the system. This work demonstrates the capabilities of the N-Ti3C2T x membrane electrode, which should provide beneficial improvements in systems targeting the serious issue of micropollutants in water.
Electrified Nitrogen-Doped MXene Membrane Electrode for Micropollutants Decontamination via Peroxymonosulfate Activation
https://orcid.org/0000-0001-8404-3806
Advanced oxidation processes based on peroxymonosulfate (PMS) activation have attracted tremendous attention as a promising approach for removing micropollutants. Herein, we designed a nitrogen-doped Ti3C2T x MXene (N-Ti3C2T x ) electrocatalytic filtration system for the activation of PMS to efficiently and selectively degrade micropollutants. The system was configured for flow-through operation, which led to significant improvements in performance compared with a conventional batch reactor system because of the enhanced convective mass transfer. Specifically, a 90.8% removal of 0.04 mmol L–1 sulfamethoxazole (SMX) solution could be achieved in flow-through mode (k = 0.0173 ± 0.0003 min–1) within 120 min under optimal conditions. This value was 4.7-fold higher than the conventional batch mode (k = 0.0037 ± 0.0001 min–1). Radical quenching tests, electron paramagnetic resonance measurements, and electrochemical tests verified that SMX was degraded in the N-Ti3C2T x /PMS filtration system primarily via nonradical pathways. Density functional theory calculations demonstrated that doping of N changed the PMS activation pathway and enhanced the ability of the N-Ti3C2T x membrane electrode to transfer electrons. In the presence of inorganic anions or humic acids (15.0 mmol L–1), the SMX removal efficiency remained above 81.1%, illustrating that naturally occurring substances in water did not interfere with the system. This work demonstrates the capabilities of the N-Ti3C2T x membrane electrode, which should provide beneficial improvements in systems targeting the serious issue of micropollutants in water.
Electrified Nitrogen-Doped MXene Membrane Electrode for Micropollutants Decontamination via Peroxymonosulfate Activation
https://orcid.org/0000-0001-8404-3806
Advanced oxidation processes based on peroxymonosulfate (PMS) activation have attracted tremendous attention as a promising approach for removing micropollutants. Herein, we designed a nitrogen-doped Ti3C2T x MXene (N-Ti3C2T x ) electrocatalytic filtration system for the activation of PMS to efficiently and selectively degrade micropollutants. The system was configured for flow-through operation, which led to significant improvements in performance compared with a conventional batch reactor system because of the enhanced convective mass transfer. Specifically, a 90.8% removal of 0.04 mmol L–1 sulfamethoxazole (SMX) solution could be achieved in flow-through mode (k = 0.0173 ± 0.0003 min–1) within 120 min under optimal conditions. This value was 4.7-fold higher than the conventional batch mode (k = 0.0037 ± 0.0001 min–1). Radical quenching tests, electron paramagnetic resonance measurements, and electrochemical tests verified that SMX was degraded in the N-Ti3C2T x /PMS filtration system primarily via nonradical pathways. Density functional theory calculations demonstrated that doping of N changed the PMS activation pathway and enhanced the ability of the N-Ti3C2T x membrane electrode to transfer electrons. In the presence of inorganic anions or humic acids (15.0 mmol L–1), the SMX removal efficiency remained above 81.1%, illustrating that naturally occurring substances in water did not interfere with the system. This work demonstrates the capabilities of the N-Ti3C2T x membrane electrode, which should provide beneficial improvements in systems targeting the serious issue of micropollutants in water.
Electrified Nitrogen-Doped MXene Membrane Electrode for Micropollutants Decontamination via Peroxymonosulfate Activation
Li, Wenxiang (author) / Jin, Limin (author) / Jiang, Shengtao (author) / Liu, Yanbiao (author)
ACS ES&T Engineering ; 4 ; 176-185
2024-01-12
Article (Journal)
Electronic Resource
English
| American Chemical Society | 2024
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