化学工程2025，Vol.53Issue(5)：11-17,7.DOI:10.3969/j.issn.1005-9954.2025.05.003
氯代烃2,4-DCP的光催化降解与机制分析
Exploration and mechanism analysis of photocatalytic degradation of chlorinated hydrocarbon 2,4-DCP
摘要
Abstract
To investigate the effect of different sintering temperatures and times on the photocatalytic performance of Li2TiO3,Li2TiO3 samples were synthesized using a high-temperature solid-phase method under various sintering conditions and characterized by XRD,SEM,UV-Vis,EIS and MS curves.2,4-DCP(2,4-dichlorophenol)was selected as the target pollutant to assess the photocatalytic degradation performance of the catalyst.The results show that the sintering temperature and time significantly affect the catalytic performance.Notably,Li2TiO3(LTO-900)sintered at 900 ℃ for 10 h exhibites the best degradation effect on 2,4-DCP within 20 min,achieving degradation rate of 100％.The impedance spectroscopy results demonstrate that temperature influences the separation efficiency of charge carriers,with the LTO-900 sample showing higher charge carrier separation efficiency.The free radical capture experiments suggest that holes and superoxide anion free radicals are the main active species in the degradation process of 2,4-DCP.The electronic local function,atomic projection band diagram and atomic projection density of states diagram further reveal that the active centers of photocatalytic reactions are closely related to the 2p orbitals and Ti—O bonds of oxygen atoms.关键词
光催化/氯代烃/2,4-二氯苯酚/Li2TiO3/理论计算Key words
photocatalysis/chlorinated hydrocarbon/2,4-dichlorophenol/Li2TiO3/theoretical calculation分类
化学化工引用本文复制引用
赖寒,周颖,樊昊,杨华夏,高蕾,李小宁,郭熙川..氯代烃2,4-DCP的光催化降解与机制分析[J].化学工程,2025,53(5):11-17,7.基金项目
重庆市社会科学规划项目(2022PY29) （2022PY29）
重庆市教委科学技术研究项目(KJQN202101628,KJQN202301613) （KJQN202101628,KJQN202301613）
重庆第二师范学院科研平台(区域旅游产业发展研究协同创新中心)项目(2021XJPT07) （区域旅游产业发展研究协同创新中心）
重庆第二师范学院校级科研项目(KY202110B) （KY202110B）
河南省科技攻关项目(242102321142) （242102321142）
