Photocatalytic dechlorination of chlorophenol pollutants in aqueous solution by covalent triazine organic framework material
In this study,covalent triazine organic framework material(CTF-1)was applied to degrade four chlorophenols(CPs)with different chlorine atoms,including 4-chlorophenol(4-CP),2,4-dichlorophenol(2,4-DCP),2,4,6-trichlorophenol(2,4,6-TCP)and pentachlorophenol(PCP).The effect and mechanism of substrate structure on the dechlorination degradation efficiency of chlorophenols were explored.The dechlorination degradation process of CPs were significantly influenced by the purpose of selecting the number of chlorine atoms in the benzene ring.The more chlorine there was,the higher the dechlorination degradation efficiency.The number of chlorine atoms was significantly positively correlated with the apparent rate constant.The results showed that the degradation rate and dechlorination rate of CPs were as follows:PCP＞2,4,6-TCP＞2,4-DCP＞4-CP.The study on the mechanism of CTF-1 photocatalytic degradation of CPs showed that the active species do not play a role in the reaction,and the system reaction mechanism was the hydrolysis dechlorination process targeting the substituted chlorine sites on CPs.This study provided a theoretical basis for further revealing the degradation mechanism of CPs,as well as a technical reference for the treatment of halogenated phenol wastewater using photocatalytic technology.
CTF-1chlorophenolsphotocatalytic degradationdechlorinationchlorine atom numbers
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