Photo-induced surface frustrated Lewis pairs for promoted photocatalytic decomposition of perfluorooctanoic acid  

作　　者：Xianjun Tan Zhenying Jiang Yuxiong Huang 

机构地区：[1]Tsinghua-Berkeley Shenzhen Institute(TBSI),Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China

出　　处：《Frontiers of Environmental Science & Engineering》2023年第1期27-32,共6页环境科学与工程前沿（英文）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.22006088 and 42077293);the Natural Science Foundation of Guangdong Province(China)(No.2019QN01L797);the Shenzhen Municipal Science and Technology Innovation Committee(China)(Nos.WDZC20200817103015002 and RCYX20210609104448111);the Tsinghua Shenzhen International Graduate School(China)(Nos.HW2020002 and QD2021010N).

摘　　要：Heterogeneous photocatalysis has gained substantial research interest in treating per-and polyfluoroalkyl substances(PFAS)-contaminated water.However,sluggish degradation kinetics and low defluorination efficiency compromise their practical applications.Here,we report a superior photocatalyst,defected Bi_(3)O(OH)(PO_(4))_(2),which could effectively degrade typical PFAS,perfluorooctanoic acid(PFOA),with high defluorination efficiency.The UV light irradiation could in situ generate oxygen vacancies on Bi_(3)O(OH)(PO_(4))_(2) through oxidation of the lattice hydroxyls,which further promotes the formation of Lewis acidic coordinately unsaturated bismuth sites.Then,the Lewis acidic sites couple with the proximal surface hydroxyls to constitute the surface frustrated Lewis pairs(SFLPs).With the in-depth spectroscopic analysis,we revealed that the photo-induced SFLPs act as collection centers to effectively adsorb PFOA and endow accessible pathways to transfer photogenerated holes to PFOA rapidly.Consequently,activation of the terminal carboxyl,a ratelimiting step for PFOA decomposition,could be easily achieved over the defected Bi_(3)O(OH)(PO_(4))_(2) photocatalyst.These results suggest that SFLPs exhibit great potential in developing highly efficient photocatalysts to degrade persistent organic pollutants.

关 键 词：Heterogeneous photocatalysis Surface frustrated Lewis pairs Perfluorooctanoic acid Defluorination efficiency Environmental remediation 

分 类 号：O62[理学—有机化学]