Insights into Photothermally Enhanced Photocatalytic U(VI)Extraction by a Step-Scheme Heterojunction  

作　　者：Yifeng Zhang Haorong Sun Feixue Gao Shuo Zhang Qingzhi Han Jing Li Ming Fang Yawen Cai Baowei Hu Xiaoli Tan Xiangke Wang 

机构地区：[1]MOE Key Laboratory of Resources and Environmental System Optimization,College of Environmental Science and Engineering,North China Electric Power University,Beijing 102206,China [2]Key Laboratory of Theoretical and Computational Photochemistry,Ministry of Education,College of Chemistry,Beijing Normal University,Beijing 100875,China [3]Key Laboratory of Photochemical Conversion and Optoelectronic Materials,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China [4]School of Life Science,Shaoxing University,Shaoxing 312000,China

出　　处：《Research》2023年第1期285-299,共15页研究（英文）

基　　金：funded by the National Key Research and Development Program of China(2018YFC1900105);National Natural Science Foundation of China(U21A20290,21876047);the Beijing Outstanding Young Scientist Program,and the Thousand Talents Plan of Qinghai province.

摘　　要：In this work,a CdS/BivO4 step-scheme(S-scheme)heterojunction with self-photothermally enhanced photocatalytic effect was synthesized and applied for efficient U(VI)photoextraction.Characterizations such as transient absorption spectroscopy and Tafel test together confirmed the formation of S-scheme heterojunctions,which allows CdS/BivO_(4) to avoid photocorrosion while retaining the strong reducing capacity of CdS and the oxidizing capacity of BivO_(4).Experimental results such as radical quenching experiments and electron spin resonance show that U(VI)is rapidly oxidized by photoholes/·OH to insoluble UO(OH)2 after being reduced to U(IV)by photoelectrons/·O2,which precisely avoids the depletion of electron sacrificial agents.The rapid recombination of electron-hole pairs triggered by the S-scheme heterojunction is found to release large amounts of heat and accelerate the photocatalysis.This work offers a new enhanced strategy for photocatalytic uranium extraction and presents a direction for the design and development of new photocatalysts.

关 键 词：SCHEME retaining thermally 

分 类 号：O644.1[理学—物理化学]