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Encapsulating MnFe LDH in Biochar Tunes Persulfate Activation from Radical to Nonradical Pathway: Significant Role of Electron Transfer
https://orcid.org/0000-0002-3265-4151
https://orcid.org/0000-0002-7105-1345
https://orcid.org/0000-0003-1610-1589
Nonradical peroxydisulfate (PDS) oxidation has attracted great interest due to its mild oxidant dosage and little environmental impact. In this study, biochar-supported flower-like MnFe layered double hydroxide (BC-LDH) was prepared, and the PDS activation mechanisms were probed with ciprofloxacin (CIP) as representative contaminant. Compared to biochar (BC), MnFe LDH, and physical mixed BC/LDH, PDS activation was tuned to an electron-transfer-dominated nonradical pathway with coprecipitated BC-LDH. Electrochemical techniques including electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), Tafel, and two-chamber experiments confirmed that the synergistic effect between BC and LDH remarkably facilitated electron transfer from CIP to PDS. Degradation efficiency ranging from 92 to 94% was achieved with a PDS dosage ranging from 0.2 to 4 mM, and degradation rate constant was inversely proportional to the electron transfer resistance of PDS activators. Three degradation pathways for CIP were proposed based on the intermediates analyzed by ultra-performance liquid chromatography-mass spectrometry/MS (UPLC-MS/MS), and the toxicity of CIP was significantly decreased. This study proposed a novel strategy for enhancing electron-transfer-dominated nonradical PDS activation pathway with biochar/transition-metal oxide composites for the remediation of contaminants.
This work provided an effective environmental remediation strategy based on the electron-transfer-dominated nonradical peroxydisulfate activation process.
Encapsulating MnFe LDH in Biochar Tunes Persulfate Activation from Radical to Nonradical Pathway: Significant Role of Electron Transfer
https://orcid.org/0000-0002-3265-4151
https://orcid.org/0000-0002-7105-1345
https://orcid.org/0000-0003-1610-1589
Nonradical peroxydisulfate (PDS) oxidation has attracted great interest due to its mild oxidant dosage and little environmental impact. In this study, biochar-supported flower-like MnFe layered double hydroxide (BC-LDH) was prepared, and the PDS activation mechanisms were probed with ciprofloxacin (CIP) as representative contaminant. Compared to biochar (BC), MnFe LDH, and physical mixed BC/LDH, PDS activation was tuned to an electron-transfer-dominated nonradical pathway with coprecipitated BC-LDH. Electrochemical techniques including electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), Tafel, and two-chamber experiments confirmed that the synergistic effect between BC and LDH remarkably facilitated electron transfer from CIP to PDS. Degradation efficiency ranging from 92 to 94% was achieved with a PDS dosage ranging from 0.2 to 4 mM, and degradation rate constant was inversely proportional to the electron transfer resistance of PDS activators. Three degradation pathways for CIP were proposed based on the intermediates analyzed by ultra-performance liquid chromatography-mass spectrometry/MS (UPLC-MS/MS), and the toxicity of CIP was significantly decreased. This study proposed a novel strategy for enhancing electron-transfer-dominated nonradical PDS activation pathway with biochar/transition-metal oxide composites for the remediation of contaminants.
This work provided an effective environmental remediation strategy based on the electron-transfer-dominated nonradical peroxydisulfate activation process.
Encapsulating MnFe LDH in Biochar Tunes Persulfate Activation from Radical to Nonradical Pathway: Significant Role of Electron Transfer
https://orcid.org/0000-0002-3265-4151
https://orcid.org/0000-0002-7105-1345
https://orcid.org/0000-0003-1610-1589
Nonradical peroxydisulfate (PDS) oxidation has attracted great interest due to its mild oxidant dosage and little environmental impact. In this study, biochar-supported flower-like MnFe layered double hydroxide (BC-LDH) was prepared, and the PDS activation mechanisms were probed with ciprofloxacin (CIP) as representative contaminant. Compared to biochar (BC), MnFe LDH, and physical mixed BC/LDH, PDS activation was tuned to an electron-transfer-dominated nonradical pathway with coprecipitated BC-LDH. Electrochemical techniques including electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), Tafel, and two-chamber experiments confirmed that the synergistic effect between BC and LDH remarkably facilitated electron transfer from CIP to PDS. Degradation efficiency ranging from 92 to 94% was achieved with a PDS dosage ranging from 0.2 to 4 mM, and degradation rate constant was inversely proportional to the electron transfer resistance of PDS activators. Three degradation pathways for CIP were proposed based on the intermediates analyzed by ultra-performance liquid chromatography-mass spectrometry/MS (UPLC-MS/MS), and the toxicity of CIP was significantly decreased. This study proposed a novel strategy for enhancing electron-transfer-dominated nonradical PDS activation pathway with biochar/transition-metal oxide composites for the remediation of contaminants.
This work provided an effective environmental remediation strategy based on the electron-transfer-dominated nonradical peroxydisulfate activation process.
Encapsulating MnFe LDH in Biochar Tunes Persulfate Activation from Radical to Nonradical Pathway: Significant Role of Electron Transfer
Zhu, Hongqing (Autor:in) / Ma, Hui (Autor:in) / Yu, Jingyang (Autor:in) / Zhao, Zhiliang (Autor:in) / Xu, Lanxin (Autor:in) / Li, Xinyi (Autor:in) / Rao, Yongfang (Autor:in) / Lai, Bo (Autor:in) / Pu, Shengyan (Autor:in)
ACS ES&T Water ; 3 ; 3343-3356
13.10.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| American Chemical Society | 2022