Effects of surface fluoride modification on TiO_(2)for the photocatalytic oxidation of toluene  

作　　者：Shaoyu Yuan Min Chen Xiaoxiao Qin Xueyan Chen Jianghao Zhang Changbin Zhang 

机构地区：[1]State Key Joint Laboratory of Environment Simulation and Pollution Control,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Environmental Sciences》2025年第1期561-570,共10页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.21976196,22276204).

摘　　要：In the present study,we investigated the influence of surface fluorine(F)on TiO_(2)for the photocatalytic oxidation(PCO)of toluene.TiO_(2)modified with different F content was prepared and tested.It was found that with the increasing of F content,the toluene conversion rate first increased and then decreased.However,CO_(2)mineralization efficiency showed the opposite trend.Based on the characterizations,we revealed that F substitutes the surface hydroxyl of TiO_(2)to form the structure of≡Ti-F.The presence of the appropriate amount of surface≡Ti-F on TiO_(2)greatly enhanced the separation of photogenerated carriers,which facilitated the generation of·OH and promoted the activity for the PCO of toluene.It was further revealed that the increase of only·OH promoted the conversion of toluene to ring-containing intermediates,causing the accumulation of intermediates and then conversely inhibited the·OH generation,which led to the decrease of the CO_(2)mineralization efficiency.The above results could provide guidance for the rational design of photocatalysts for toluene oxidation.

关 键 词：PHOTOCATALYSIS TiO_(2) TOLUENE FLUORINE 

分 类 号：X701[环境科学与工程—环境工程]