Efficient piezocatalytic activation of peroxydisulfate over Bi_(2)Fe_(4)O_(9):thickness-dependent synergy effect between peroxydisulfate activation and piezocatalysis  

作　　者：Chuang-Jian Su Chao-Lin Li Wen-Hui Wang 

机构地区：[1]School of Civil and Environmental Engineering,Harbin Institute of Technology,Shenzhen 518055,China [2]State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin 150090,China

出　　处：《Rare Metals》2023年第12期4005-4014,共10页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos.52170155 and 52100084)。

摘　　要：Piezocatalytic activation of persulfate(PS) has great application potential in environmental remediation;however,the relationship between piezocatalyst thickness and catalytic activity is not clear,limiting the further improvement of catalytic activity and application of the technology.Herein,the Bi_(2)Fe_(4)O_(9)(BFO) piezocatalysts with tunable thickness were prepared through a facile hydrothermal method by tuning the molar ratio of Bi(NO_(3)),5H_(2)O and FeCl_(3)·6H_(2)O for piezocatalytic activation of peroxydisulfate(PDS).The BFO with the smallest thickness exhibits excellent catalytic activity,and the SO_(4)^(·-)and ·OH are the major reactive oxygen species for degrading organic pollutants.Further XPS investigations and finite element analyses demonstrate that the decreased thickness of BFO not only exposes more Fe^(2+)sites for PDS activation,but also improve the piezoelectric effect to accelerate the regeneration of Fe^(2+),thus enabling an enhanced synergy effect between PDS activation and piezocatalysis for outstanding catalytic activity.This work provides an understanding of the relationship between thickness of piezocatalysts and its catalytic activity over PDS activation,facilitating the development of more efficient piezocatalysts and PS-based advanced oxidation processes.

关 键 词：Bi_(2)Fe_(4)O_(9)(BFO)piezocatalyst Active sites Piezocatalytic activation Peroxydisulfate(PDS) Reactive oxygen species Environment remediation 

分 类 号：TQ426[化学工程]