共价三嗪有机框架材料对水中氯酚类污染物的光催化脱氯降解
Photocatalytic dechlorination of chlorophenol pollutants in aqueous solution by covalent triazine organic framework material
黄璐玫 1穆毅 2郑灵玲 2陈鹏 2宋晓红 3梁延鹏 3曾鸿鹄 3邹建平1
作者信息
- 1. 桂林理工大学环境科学与工程学院,桂林,541006;江西省持久性污染物控制与资源化利用重点实验室,南昌航空大学,南昌,330063
- 2. 江西省持久性污染物控制与资源化利用重点实验室,南昌航空大学,南昌,330063
- 3. 桂林理工大学环境科学与工程学院,桂林,541006
- 折叠
摘要
利用共价三嗪有机框架材料(CTF-1)对4-氯酚(4-CP)、2,4-二氯酚(2,4-DCP)、2,4,6-三氯酚(2,4,6-TCP)和五氯酚(PCP)等4种不同氯原子取代数目的氯酚类污染物进行光催化降解研究,探讨了底物结构对氯酚脱氯降解效率的影响及机制.结果表明,氯酚脱氯降解过程明显受苯环氯原子取代数目的影响,氯原子数目越多,脱氯降解效率越高,氯原子数目与表观速率常数呈显著正相关,氯酚降解及脱氯速率均为:PCP＞2,4,6-TCP＞2,4-DCP＞4-CP.对CTF-1光催化降解氯酚机制研究表明,活性物种在反应中不起作用,体系反应机制为针对氯酚上取代氯位点进行水解脱氯过程.本研究结果为深入揭示氯酚脱氯降解机制提供了理论依据,也为光催化技术处理卤代酚类废水提供了技术参考.
Abstract
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.
关键词
CTF-1/氯酚/光催化降解/脱氯/氯原子数目Key words
CTF-1/chlorophenols/photocatalytic degradation/dechlorination/chlorine atom numbers引用本文复制引用
基金项目
国家自然科学基金(51578171)
国家自然科学基金(52170082)
广西自然科学基金杰出青年基金(2022GXNSFFA035033)
出版年
2024
NETL
NSTL
万方数据