Visible-light induced photocatalytic removal of U(VI) from aqueous solution by MoS2/g-C3N4 nanocomposites

Zhang, Zhibin; Zhou, Ru; Dong, Zhili; Wu, Yongchuan; Xu, Lin; Xie, Yinhui; Li, Zifan; Xiong, Yutian; Wang, Youqun; Liu, Yuhui

doi:10.1007/s10967-020-07567-x

Cited by 16 publications

(8 citation statements)

References 40 publications

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“…39 Among them, the addition of CO 3 2− decreased the removal efficiency of U( vi ) by approximately 19%, which may be related to the increase in the solution pH due to the addition of CO 3 . 2–40 To summarize, the coexisting metal ions and anions have a minor impact on the photoreduction of U( vi ), even when their concentration is 10 times higher than that of U( vi ), indicating little effect on the removal efficiency of U( vi ). Therefore, it is confirmed that 10%BgM has high anti-interference ability for the removal of U( vi ).…”

Section: Resultsmentioning

confidence: 98%

“…Therefore, the electrostatic repulsion hinders the contact between the catalyst and the positively charged UO 2 2+ , thereby obstructing the reduction reaction. 36 This electrostatic repulsion became weak as the pH increased due to the appearance of UO 2 OH + , UO 2 (OH), and (UO 2 ) 3 (OH) 5+ . Nevertheless, the protons will compete with U( vi ) to consume photogenerated e − , thus reducing the photoreduction activity of BgM.…”

Section: Resultsmentioning

confidence: 99%

“…37 However, when the pH was further increased to 7, OH − could hinder the e-transfer on the photocatalyst surface. 36…”

Section: Resultsmentioning

confidence: 99%

“…37 However, when the pH was further increased to 7, OH À could hinder the e-transfer on the photocatalyst surface. 36 In uranium-containing wastewater, various metal ions and anions are typically present. The effect of various interfering ions on the photocatalytic activity of 10%BgM, including K + , Cu 2+ , Ca 2+ , Mg 2+ , F À , SO 4 2À , NO 3 À , and CO 3 2À , the results as shown in Fig.…”

Section: Photocatalytic Performancesmentioning

confidence: 99%

See 3 more Smart Citations

Enhanced photocatalytic removal of U(vi) from water using tea waste biochar/g-C₃N₄/MoS₂ Z-scheme composite: synthesis, performance, and mechanistic insights

Liu,

He,

Duan

et al. 2024

New J. Chem.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

“…37 However, when the pH was further increased to 7, OH − could hinder the e-transfer on the photocatalyst surface. 36…”

Section: Resultsmentioning

confidence: 99%

Section: Photocatalytic Performancesmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced photocatalytic removal of U(vi) from water using tea waste biochar/g-C₃N₄/MoS₂ Z-scheme composite: synthesis, performance, and mechanistic insights

Liu,

He,

Duan

et al. 2024

New J. Chem.

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“…Thus, it is necessary to investigate the electronic structure and photocatalytic mechanism of s-triazine-based MoS 2 /g-C 3 N 4 heterojunctions. According to their band energy alignment, most MoS 2 /g-C 3 N 4 heterojunctions were described as type-II heterojunctions. , Besides, a small number of Z-scheme MoS 2 /g-C 3 N 4 heterojunction photocatalysts were recommended in experiments . In fact, the band structure of the Z-scheme photocatalyst is similar to that of a type-II heterojunction, and yet their photogenerated carrier transfer pathways are distinctly different.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Type I/II g-C₃N₄/MoS₂ van der Waals Heterostructures: A New Theoretical Insight

Wang

Fan

et al. 2023

J. Chem. Inf. Model.

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The charge transfer mechanism of the g-C 3 N 4 /MoS 2 heterojunction is still disputed. Some regard it as a type I pathway, some regard it as a type II pathway, and still some regard it as a Z-scheme pathway. Especially, the results obtained by density functional theory (DFT) calculations are not totally in agreement. Here, we constructed four g-C 3 N 4 /MoS 2 heterojunctions on the basis of the aperture alignment modes of g-C 3 N 4 and MoS 2 . Their morphology and photocatalytic activity were investigated via first-principles and excited state dynamics simulations. By systemically comparing the interfacial binding energy and electronic structure (e.g., band structure, electrostatic potential, and band edge positions) of g-C 3 N 4 /MoS 2 heterojunctions, we found that both type I and type II band alignment structures could be obtained. Moreover, the calculated lifetimes of interlayer photogenerated electrons and holes show that type II g-C 3 N 4 /MoS 2 tends to favor a general type II pathway rather than a Zscheme pathway. This study could provide a deep understanding of the photocatalytic mechanism of g-C 3 N 4 /MoS 2 van der Waals heterostructures, which will be of great use for applications in photocatalysis.

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New Strategy for the Persistent Photocatalytic Reduction of U(VI): Utilization and Storage of Solar Energy in K⁺ and Cyano Co‐Decorated Poly(Heptazine Imide)

Wang

et al. 2022

Advanced Science

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The photocatalytic conversion of soluble U(VI) into insoluble U(IV) is a robust strategy to harvest aqueous uranium, but remains challenging owing to the intermittent availability of solar influx and reoxidation of U(IV) without illumination. Herein, a dual platform based on K + and cyano group co-decorated poly(heptazine imide) (K-CN-PHI) is reported that can drive persistent U(VI) extraction upon/beyond light. K-CN-PHI achieves the photocatalytic reduction of U(VI) with a reaction rate of 0.89 min −1 , being 47 times greater than that over pristine carbon nitride (PCN). This system can further be triggered by light to form long-living radicals, driving the reduction of U(VI) in the dark for over 3 d. The flexible structural K + as counterions stabilize the electrons trapped by cyanamide groups, enabling the long lifetime of the generated radicals. The results collectively prove K-CN-PHI to be a novel and efficient photocatalyst enabling persistent U(VI) extraction around the clock, and broadening the practical applications of the photocatalytic extraction of U(VI).

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Visible-light induced photocatalytic removal of U(VI) from aqueous solution by MoS2/g-C3N4 nanocomposites

Cited by 16 publications

References 40 publications

Enhanced photocatalytic removal of U(vi) from water using tea waste biochar/g-C₃N₄/MoS₂ Z-scheme composite: synthesis, performance, and mechanistic insights

Enhanced photocatalytic removal of U(vi) from water using tea waste biochar/g-C₃N₄/MoS₂ Z-scheme composite: synthesis, performance, and mechanistic insights

Characterization of Type I/II g-C₃N₄/MoS₂ van der Waals Heterostructures: A New Theoretical Insight

New Strategy for the Persistent Photocatalytic Reduction of U(VI): Utilization and Storage of Solar Energy in K⁺ and Cyano Co‐Decorated Poly(Heptazine Imide)

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Visible-light induced photocatalytic removal of U(VI) from aqueous solution by MoS2/g-C3N4 nanocomposites

Cited by 16 publications

References 40 publications

Enhanced photocatalytic removal of U(vi) from water using tea waste biochar/g-C3N4/MoS2 Z-scheme composite: synthesis, performance, and mechanistic insights

Enhanced photocatalytic removal of U(vi) from water using tea waste biochar/g-C3N4/MoS2 Z-scheme composite: synthesis, performance, and mechanistic insights

Characterization of Type I/II g-C3N4/MoS2 van der Waals Heterostructures: A New Theoretical Insight

New Strategy for the Persistent Photocatalytic Reduction of U(VI): Utilization and Storage of Solar Energy in K+ and Cyano Co‐Decorated Poly(Heptazine Imide)

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Product

Resources

About

Enhanced photocatalytic removal of U(vi) from water using tea waste biochar/g-C₃N₄/MoS₂ Z-scheme composite: synthesis, performance, and mechanistic insights

Enhanced photocatalytic removal of U(vi) from water using tea waste biochar/g-C₃N₄/MoS₂ Z-scheme composite: synthesis, performance, and mechanistic insights

Characterization of Type I/II g-C₃N₄/MoS₂ van der Waals Heterostructures: A New Theoretical Insight

New Strategy for the Persistent Photocatalytic Reduction of U(VI): Utilization and Storage of Solar Energy in K⁺ and Cyano Co‐Decorated Poly(Heptazine Imide)