2, 4-Dichlorophenol Degradation Mechanism over Co3O4@Carbon Fiber with Induced Electron-poor/rich Electronic Center by Activating PMS

Abstract

Purposes Rapid industrial development has led to increased levels of chlorophenolic pollutants in water bodies, which poses threats to ecosystems and human survival. Methods In order to efficiently degrade the refractory contaminant 2, 4-dichlorophenol (2, 4-DCP) in industrial wastewater, a Co3O4-coated carbon fiber catalyst (Co3O4@CF) with poor/rich electron-active centers was prepared by one-step impregnation method, and applied to the study of activated persulfate degradation of 2, 4-DCP. Findings The results show that Co3O4 is uniformly coated on the surface of carbon fibers with regular skeleton structure, and electron-rich cobalt centers and electron-poor carbon centers are formed under the Co(Ⅱ)-π interactions. Under the initial conditions of pH 3.0～7.8, 2, 4-DCP mass concentration of 50 mg/L, Co3O4@CF mass concentration of 0.1 g/L, and PMS concentration of 10 mmol/L, the complete degradation of 2, 4-DCP is achieved by Co3O4@CF within 20 min. During the process, Co3O4@CF can induce the transfer of electrons from electron-poor to electron-rich centers in the reaction system to achieve rapid reduction of Co3＋ and rapid activation of PMS. The characterization results further demonstrate that carbon fibers can not only at as carriers, but also participate in the PMS activated chain radical reaction through their structural defects, thus promoting the conversion of SO4-· to 1O2 and O2-· for the efficient degradation of 2, 4-DCP.

Keywords

• carbon fiber
• co3o4
• poor/rich electronic center
• 2, 4-dichlorophenol
• catalytic degradation