首页|Singlet oxygen-dominated non-radical oxidation pathway for 2,4-Dichlorophenol degradation over CeO2 coated carbon fibers
Singlet oxygen-dominated non-radical oxidation pathway for 2,4-Dichlorophenol degradation over CeO2 coated carbon fibers
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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.
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