Photocatalysis uranium (VI) reduction at Cu2O/WO3|FTO Z-scheme heterojunction systems

Ning Liu; Hongsen Zhang; Jiahui Zhu; Qi Liu; Jing Yu; Rongrong Chen; Ying Li; Rumin Li; Jun Wang

doi:10.1016/j.jece.2024.112185

Photocatalysis uranium (VI) reduction at Cu₂O/WO₃|FTO Z-scheme heterojunction systems

Ning Liu, Hongsen Zhang^*, Jiahui Zhu, Qi Liu, Jing Yu, Rongrong Chen, Ying Li, Rumin Li, Jun Wang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

A two-step method was used to synthesize Cu₂O/WO₃ composites with Z-scheme electron transfer on the surface of FTO, which were then utilized for the photocatalytic reduction of U(VI). At pH = 6, the U(VI) photocatalytic reduction achieves a removal ratio of 98.3% and a first order rate constant rate of 0.0216 min⁻¹. In 10 cycles, the Cu₂O/WO₃|FTO photocatalytic reduction of U(VI) maintained a 95.01% efficiency. The four stages of photocatalytic uranium reduction are calculated and described by DFT. (1) Cu₂O/WO₃|FTO competes with uranium clusters. (2) Adsorption is completed by the active site of Cu₂O/WO₃|FTO. (3) Cu₂O/WO₃|FTO-[UO₂(OH)₂]·2 H₂O produces photoelectron reduction U(VI) after exposure to light; (4) The generated U(IV) is detached from the adsorption site under the action of water flow.

Original language	English
Article number	112185
Journal	Journal of Environmental Chemical Engineering
Volume	12
Issue number	2
DOIs	https://doi.org/10.1016/j.jece.2024.112185
Publication status	Published - Apr 2024
Externally published	Yes

Keywords

CuO/WO|FTO composites
Excited state DFT calculation
Photocatalysis reduction
Uranium extraction

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10.1016/j.jece.2024.112185

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title = "Photocatalysis uranium (VI) reduction at Cu2O/WO3|FTO Z-scheme heterojunction systems",

abstract = "A two-step method was used to synthesize Cu2O/WO3 composites with Z-scheme electron transfer on the surface of FTO, which were then utilized for the photocatalytic reduction of U(VI). At pH = 6, the U(VI) photocatalytic reduction achieves a removal ratio of 98.3% and a first order rate constant rate of 0.0216 min−1. In 10 cycles, the Cu2O/WO3|FTO photocatalytic reduction of U(VI) maintained a 95.01% efficiency. The four stages of photocatalytic uranium reduction are calculated and described by DFT. (1) Cu2O/WO3|FTO competes with uranium clusters. (2) Adsorption is completed by the active site of Cu2O/WO3|FTO. (3) Cu2O/WO3|FTO-[UO2(OH)2]·2 H2O produces photoelectron reduction U(VI) after exposure to light; (4) The generated U(IV) is detached from the adsorption site under the action of water flow.",

keywords = "CuO/WO|FTO composites, Excited state DFT calculation, Photocatalysis reduction, Uranium extraction",

author = "Ning Liu and Hongsen Zhang and Jiahui Zhu and Qi Liu and Jing Yu and Rongrong Chen and Ying Li and Rumin Li and Jun Wang",

note = "Publisher Copyright: {\textcopyright} 2024 Elsevier Ltd",

year = "2024",

month = apr,

doi = "10.1016/j.jece.2024.112185",

language = "English",

volume = "12",

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T1 - Photocatalysis uranium (VI) reduction at Cu2O/WO3|FTO Z-scheme heterojunction systems

AU - Liu, Ning

AU - Zhang, Hongsen

AU - Zhu, Jiahui

AU - Liu, Qi

AU - Yu, Jing

AU - Chen, Rongrong

AU - Li, Ying

AU - Li, Rumin

AU - Wang, Jun

PY - 2024/4

Y1 - 2024/4

N2 - A two-step method was used to synthesize Cu2O/WO3 composites with Z-scheme electron transfer on the surface of FTO, which were then utilized for the photocatalytic reduction of U(VI). At pH = 6, the U(VI) photocatalytic reduction achieves a removal ratio of 98.3% and a first order rate constant rate of 0.0216 min−1. In 10 cycles, the Cu2O/WO3|FTO photocatalytic reduction of U(VI) maintained a 95.01% efficiency. The four stages of photocatalytic uranium reduction are calculated and described by DFT. (1) Cu2O/WO3|FTO competes with uranium clusters. (2) Adsorption is completed by the active site of Cu2O/WO3|FTO. (3) Cu2O/WO3|FTO-[UO2(OH)2]·2 H2O produces photoelectron reduction U(VI) after exposure to light; (4) The generated U(IV) is detached from the adsorption site under the action of water flow.

AB - A two-step method was used to synthesize Cu2O/WO3 composites with Z-scheme electron transfer on the surface of FTO, which were then utilized for the photocatalytic reduction of U(VI). At pH = 6, the U(VI) photocatalytic reduction achieves a removal ratio of 98.3% and a first order rate constant rate of 0.0216 min−1. In 10 cycles, the Cu2O/WO3|FTO photocatalytic reduction of U(VI) maintained a 95.01% efficiency. The four stages of photocatalytic uranium reduction are calculated and described by DFT. (1) Cu2O/WO3|FTO competes with uranium clusters. (2) Adsorption is completed by the active site of Cu2O/WO3|FTO. (3) Cu2O/WO3|FTO-[UO2(OH)2]·2 H2O produces photoelectron reduction U(VI) after exposure to light; (4) The generated U(IV) is detached from the adsorption site under the action of water flow.

KW - CuO/WO|FTO composites

KW - Excited state DFT calculation

KW - Photocatalysis reduction

KW - Uranium extraction

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DO - 10.1016/j.jece.2024.112185

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Photocatalysis uranium (VI) reduction at Cu₂O/WO₃|FTO Z-scheme heterojunction systems

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