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Enhanced photocatalytic U(VI) reduction via double internal electric field in CoWO4/covalent organic frameworks p-n heterojunction.
Bi, Rui-Xiang; Peng, Zhi-Hai; Lei, Lan; Wang, Xiao-Xing; Liu, Xin; Zhang, Li; Liang, Ru-Ping; Qiu, Jian-Ding.
Afiliación
  • Bi RX; School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, PR China.
  • Peng ZH; School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, PR China.
  • Lei L; School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, PR China.
  • Wang XX; School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, PR China.
  • Liu X; School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, PR China.
  • Zhang L; School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, PR China.
  • Liang RP; School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, PR China. Electronic address: rpliang@ncu.edu.cn.
  • Qiu JD; School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, PR China; State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, PR China. Electronic address: jdqiu@ncu.edu.cn.
J Hazard Mater ; 475: 134869, 2024 Aug 15.
Article en En | MEDLINE | ID: mdl-38870857
ABSTRACT
Photoreduction of highly toxic U(VI) to less toxic U(IV) is crucial for mitigating radioactive contamination. Herein, a CoWO4/TpDD p-n heterojunction is synthesized, with TpDD serving as the n-type semiconductor substrate and CoWO4 as the p-type semiconductor grown in situ on its surface. The Fermi energy difference between TpDD and CoWO4 provides the electrochemical potential for charge-hole separation. Moreover, the Coulombic forces from the distinct carrier types between the two materials synergistically facilitate the transfer of electrons and holes. Hence, an internal electric field directed from TpDD to CoWO4 is established. Under photoexcitation conditions, charges and holes migrate efficiently along the curved band and internal electric field, further enhancing charge-hole separation. As a result, the removal capacity of CoWO4/TpDD increases from 515.2 mg/g in the dark to 1754.6 mg/g under light conditions. Thus, constructing a p-n heterojunction proves to be an effective strategy for remediating uranium-contaminated environments.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Hazard Mater Asunto de la revista: SAUDE AMBIENTAL Año: 2024 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Hazard Mater Asunto de la revista: SAUDE AMBIENTAL Año: 2024 Tipo del documento: Article Pais de publicación: Países Bajos