Enhanced photocatalytic ammonia oxidation activity and nitrogen selectivity over Ag/AgCl/N-TiO_(2) photocatalyst  

作　　者：Jiaojiao Guan Daorong Li Jiahui Feng Peng Xu Zhaonian Li Siqi Ge Hongxia Chen Kunfeng Zhang 

机构地区：[1]College of Environmental Engineering,Henan University of Technology,Zhengzhou 450001,China [2]CAS Key Laboratory of Standardization and Measurement for Nanotechnology,National Center for Nanoscience and Technology,Beijing 100190,China [3]Department of Chemistry,Tsinghua University,Beijing 100084,China

出　　处：《Journal of Environmental Sciences》2024年第4期395-405,共11页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22206045 and 22206102);the Doctoral Scientific Research Start-up Foundation from Henan University of Technology(No.2021BS059);the Science and Technology Key Project Foundation from Education Department of Henan Province(No.23A610011)。

摘　　要：The removal of ammonia(NH_(3))emitted from agricultural and industrial activities is of great significance to protect human health and ecological environment.Photocatalytic NH_(3)oxidation to N2under mild conditions is a promising strategy.However,developing visible light photocatalysts for NH_(3)oxidation is still in its infancy.Here,we fabricate N-TiO_(2)and Ag/AgCl/N-TiO_(2)photocatalysts by sol-gel and photodeposition methods,respectively.The introduction of N not only endows TiO_(2)with visible light response(absorption edge at460 nm)but also results in the formation of heterophase junction(anatase and rutile).Thus,N-TiO_(2)shows 2.0 and 1.8 times higher than those over anatase TiO_(2)and commercial TiO_(2)for NH_(3)oxidation under full spectrum irradiation.Meanwhile,surface modification of Ag can simultaneously enhance visible light absorption(generating localized surface plasmon resonance effect)and charge separation efficiency.Therefore,the photocatalytic activity of Ag/AgCl/N-TiO_(2)is further improved.Furthermore,the presence of N and Ag also enhances the selectivity of N2product owing to the change of reaction pathway.This work simultaneously regulates photocatalytic conversion efficiency and product selectivity,providing some guidance for developing highly efficient photocatalysts for NH_(3)elimination.

关 键 词：TiO_(2) Doping Surface modification PHOTOCATALYSIS NH_(3)elimination 

分 类 号：X701[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]