Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Singlet oxygen-dominated non-radical oxidation pathway for 2,4-Dichlorophenol degradation over CeO2 coated carbon fibers
CeO2 was uniformly coated onto the surface of carbon fibers (CF) and the resulting CeO2@CF was employed for the activation of peroxymonosulfate (PMS) to degrade 2,4-Dichlorophenol (2,4-DCP). Under the initial conditions of a PMS concentration of 10 mmol/L, pH range of 3 to 9 and a CeO2@CF mass concentration of 0.1 g/L, the system achieved complete degradation of 50 mg/L of 2,4-DCP with high mineralization efficiency within 60 min. Additionally, the CeO2@CF/PMS system showed high efficiency in the presence of coexisted anions (HCO3−, CO32−, SO42−, Cl−) and exhibited excellent purification capability for actual coking wastewater. Combined with characterization analyses (SEM-EDS, XRD, Raman, XPS, and EPR), degradation experiments and radical quenching experiments, the physicochemical properties of the prepared catalyst and the 2,4-DCP degradation mechanism were explored. Results revealed that CeO2 was uniformly coated on the CF surface, maintaining a regular framework structure. During this process, Ce4+ in CeO2 was reduced to Ce3+, resulting in numerous electron-rich oxygen vacancies forming inside CeO2@CF. Furthermore, the CeO2 coating increased the amount of oxygen-containing groups (C=O) on the surface of CF and graphite defects. In the CeO2@CF/PMS system, •O2− and 1O2 were generated at the active sites of the oxygen vacancies (Vo) and C=O with 1O2 dominated non-free radical pathway and played a notable role in the 2,4-DCP degradation process.
Singlet oxygen-dominated non-radical oxidation pathway for 2,4-Dichlorophenol degradation over CeO2 coated carbon fibers
CeO2 was uniformly coated onto the surface of carbon fibers (CF) and the resulting CeO2@CF was employed for the activation of peroxymonosulfate (PMS) to degrade 2,4-Dichlorophenol (2,4-DCP). Under the initial conditions of a PMS concentration of 10 mmol/L, pH range of 3 to 9 and a CeO2@CF mass concentration of 0.1 g/L, the system achieved complete degradation of 50 mg/L of 2,4-DCP with high mineralization efficiency within 60 min. Additionally, the CeO2@CF/PMS system showed high efficiency in the presence of coexisted anions (HCO3−, CO32−, SO42−, Cl−) and exhibited excellent purification capability for actual coking wastewater. Combined with characterization analyses (SEM-EDS, XRD, Raman, XPS, and EPR), degradation experiments and radical quenching experiments, the physicochemical properties of the prepared catalyst and the 2,4-DCP degradation mechanism were explored. Results revealed that CeO2 was uniformly coated on the CF surface, maintaining a regular framework structure. During this process, Ce4+ in CeO2 was reduced to Ce3+, resulting in numerous electron-rich oxygen vacancies forming inside CeO2@CF. Furthermore, the CeO2 coating increased the amount of oxygen-containing groups (C=O) on the surface of CF and graphite defects. In the CeO2@CF/PMS system, •O2− and 1O2 were generated at the active sites of the oxygen vacancies (Vo) and C=O with 1O2 dominated non-free radical pathway and played a notable role in the 2,4-DCP degradation process.
Singlet oxygen-dominated non-radical oxidation pathway for 2,4-Dichlorophenol degradation over CeO2 coated carbon fibers
Front. Environ. Sci. Eng.
Wei, Yuexing (Autor:in) / Li, Linyu (Autor:in) / Fang, Bin (Autor:in) / He, Ziyue (Autor:in) / Zhang, Jiansheng (Autor:in) / Zhang, Yuxun (Autor:in) / Qin, Yuhong (Autor:in) / He, Chong (Autor:in)
01.12.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Non-radical pathway dominated catalytic oxidation of As(III) with stoichiometric H2O2 over nanoceria
| DOAJ | 2019
Oxygen vacancy promoted CO oxidation over Pt/CeO2 catalysts: A reaction at Pt–CeO2 interface
| British Library Online Contents | 2014
Titanium Dioxide-Photocatalized Oxidation of 2,4-Dichlorophenol
| Online Contents | 1994