Photocatalytic uranium reduction has been proposed as an effective method for treating nuclear wastewater due to its advantages of cleanliness,energy efficiency,and convenience in application.In this study,a Z-scheme ...Photocatalytic uranium reduction has been proposed as an effective method for treating nuclear wastewater due to its advantages of cleanliness,energy efficiency,and convenience in application.In this study,a Z-scheme heterojunction,ZnCdS-P_(2)W_(12)Fe_(9)AO,was designed and synthesized for achieving efficient uranium reduction via an adsorption–photoreduction synergistic strategy.DFT calculation results demonstrated that polyoxometalates modified with amidoxime groups exhibited exceptional uranium adsorption performance.The construction of the Z-scheme heterojunction enhanced visible light absorption,facilitated electron transfer,and promoted the separation of photogenerated electrons and holes.Finally,ZnCdS-P_(2)W_(12)Fe_(9)AO achieved a uranium removal rate of 97.7%(610.6 mg g^(−1) under light irradiation)without the addition of any sacrificial agent.Meanwhile,ZnCdS-P_(2)W_(12)Fe_(9)AO maintained good stability and reusability.This study offers new insights and perspectives for advancing research on photocatalytic uranium reduction.展开更多
基金supported by the Natural Science Foundation of China(Grant No.22071018)the Natural Science Foundation of Jilin Province(No.20220101069JC).
文摘Photocatalytic uranium reduction has been proposed as an effective method for treating nuclear wastewater due to its advantages of cleanliness,energy efficiency,and convenience in application.In this study,a Z-scheme heterojunction,ZnCdS-P_(2)W_(12)Fe_(9)AO,was designed and synthesized for achieving efficient uranium reduction via an adsorption–photoreduction synergistic strategy.DFT calculation results demonstrated that polyoxometalates modified with amidoxime groups exhibited exceptional uranium adsorption performance.The construction of the Z-scheme heterojunction enhanced visible light absorption,facilitated electron transfer,and promoted the separation of photogenerated electrons and holes.Finally,ZnCdS-P_(2)W_(12)Fe_(9)AO achieved a uranium removal rate of 97.7%(610.6 mg g^(−1) under light irradiation)without the addition of any sacrificial agent.Meanwhile,ZnCdS-P_(2)W_(12)Fe_(9)AO maintained good stability and reusability.This study offers new insights and perspectives for advancing research on photocatalytic uranium reduction.
