The facile fabrication of 2D/3D Z-scheme g-C3N4/UiO-66 heterojunction with enhanced photocatalytic Cr(VI) reduction performance under white light

Yi, Xiaoyan; Ma, Siqi; Du, Xuedong; Zhao, Chen; Fu, Huifen; Wang, Peng; Wang, Chong-Chen

doi:10.1016/j.cej.2019.121944

Cited by 276 publications

(58 citation statements)

References 79 publications

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“…Isopropyl alcohol (IPA) and disodium ethylenediaminetetraacetate (EDTA-2Na) were chosen as scavengers for removing •OH and h + , respectively. N2 was continuously bubbled into the reaction system for removing the soluble oxygen, eliminating the formation of •O2 − [54,55]. As shown in Figure 8, the addition of IPA (1 mM) had an extremely small effect on the photocatalytic Generally, three steps are involved in the photocatalytic process: (1) semiconductor photocatalysts were irradiated by light, leading to the formation of photogenerated electrons and holes; (2) photoinduced electrons and holes were separated and transferred to the surface of the photocatalyst; (3) the photoexcited electrons and holes participated in the surface redox reactions [51].…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Construction of Electrostatic Self-Assembled 2D/2D CdIn2S4/g-C3N4 Heterojunctions for Efficient Visible-Light-Responsive Molecular Oxygen Activation

Yuan

et al. 2021

Nanomaterials

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Molecular oxygen activated by visible light to generate radicals with high oxidation ability exhibits great potential in environmental remediation The efficacy of molecular oxygen activation mainly depends on the separation and migration efficiency of the photoinduced charge carriers. In this work, 2D/2D CdIn2S4/g-C3N4 heterojunctions with different weight ratios were successfully fabricated by a simple electrostatic self-assembled route. The optimized sample with a weight ratio of 5:2 between CdIn2S4 and g-C3N4 showed the highest photocatalytic activity for tetracycline hydrochloride (TCH) degradation, which also displayed good photostability. The enhancement of the photocatalytic performance could be ascribed to the 2D/2D heterostructure; this unique 2D/2D structure could promote the separation and migration of the photoinduced charge carriers, which was beneficial for molecular oxygen activation, leading to an enhancement in photocatalytic activity. This work may possibly provide a scalable way for molecular oxygen activation in photocatalysis.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Construction of Electrostatic Self-Assembled 2D/2D CdIn2S4/g-C3N4 Heterojunctions for Efficient Visible-Light-Responsive Molecular Oxygen Activation

Yuan

et al. 2021

Nanomaterials

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“…To verify the proposal, a radical quenching experiment was conducted. tert ‐Butyl alcohol (TBA), as a scavenger of hydroxyl radicals, was added into the CR/NNU‐37/H 2 O 2 /visible light system. As shown in Figure a, the photocatalytic performance is significantly depressed upon the addition of TBA.…”

Section: Resultsmentioning

confidence: 99%

“…This was explored using electron quenching experiments. AgNO 3 was chosen as an effective scavenger of photoinduced electrons on NNU‐37 . As shown in Figure a, the addition of AgNO 3 in the system could depress the reaction effectively where only about 74.2% of Cr(VI) was degraded at 110 min.…”

Section: Resultsmentioning

confidence: 99%

“…have been explored for introducing visible light absorption centers in MOFs. A number of visible‐light‐responsive MOFs have been prepared for photocatalytic application . However, the synthesis of novel visible‐light‐reactive MOF photocatalysts is still a great challenge, due to issues including structural uncertainty under hydrothermal/solvothermal conditions, limited visible‐light‐active ligands, relatively poor chemical stability etc.…”

Section: Introductionmentioning

confidence: 99%

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Construction of visible‐light‐responsive metal–organic framework with pillared structure for dye degradation and Cr(VI) reduction

Guo

Zhao

Liu

et al. 2020

Applied Organom Chemis

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A water‐stable mixed‐linker metal–organic framework (MOF) was rationally synthesized using a controllable pillared‐layer method. The prepared Co(II)–MOF shows wide‐range absorption in the visible light region due to the incorporation of highly conjugated anthracene‐based bipyridine ligand. Experiments suggest that the MOF is highly efficient for the photoreduction of toxic Cr(VI) ions in water under visible light. Important issues affecting photocatalytic performance, such as the influence of pH and the control of electron–hole separation by scavenger, were carefully examined. Beyond Cr(VI) ions, we also explored the photocatalytic degradation performance of the MOF using a persistent azo dye as a model substrate, where H2O2‐involved advanced oxidation process was applied. Control experiments suggest that the introduction of environmentally benign H2O2 significantly enhances the degradation performance due to the generation of reactive hydroxyl radicals. The study not only demonstrates the great feasibility of the preparation of a new MOF photocatalyst through a controllable pillared‐layer method, but also reveals that rational functionalization of ligand in the MOF is convenient for achieving desirable applications.

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Semiconducting Metal–Organic Frameworks Decorated with Spatially Separated Dual Cocatalysts for Efficient Uranium(VI) Photoreduction

Tang

Cao

et al. 2022

Adv Funct Materials

125

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Reduction of soluble hexavalent uranium (U(VI)) to sparingly soluble tetravalent uranium (U(IV)) with semiconductor photocatalysts is recognized as a novel, green, and simple U‐extraction method. Furthermore, effective charge separation and utilization are critical factors to achieve high‐efficiency U(VI) photoreduction. Herein, a UiO‐66‐based heterostructured photocatalyst (MnOx/UiO‐66/Ti3C2Tx) with spatially separated dual cocatalysts (MnOx nanoparticles and Ti3C2Tx MXene nanosheets) is successfully developed for efficient U(VI) photoreduction without sacrificial agents. As co‐catalysts, MnOx nanoparticles favor the trapping of holes, while Ti3C2Tx MXene nanosheets tend to collect electrons. Consequently, the photogenerated holes and electrons flow into and out of the photocatalyst, respectively, achieving efficient charge separation required by MnOx/UiO‐66/Ti3C2Tx to remove U(VI). Impressively, the U(VI) removal ratio via MnOx/UiO‐66/Ti3C2Tx reaches to 98.4% in the U(VI) solution after 60 min, with a photoreaction rate constant of 0.0948 min−1. Moreover, MnOx/UiO‐66/Ti3C2Tx exhibits brilliant U(VI) extraction capacity in various U(VI) wastewater and U(VI)‐spiked real seawater. Further mechanistic studies indicates that the photogenerated electrons are transferred from the conduction band of UiO‐66 to Ti3C2Tx MXene to reduce U(VI) and generate ·O2–, further leading to a stable crystal phase of (UO2)O2·2H2O. Furthermore, the photogenerated holes are extracted by MnOx nanoparticles in MnOx/UiO‐66/Ti3C2Tx to oxidize water.

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The facile fabrication of 2D/3D Z-scheme g-C3N4/UiO-66 heterojunction with enhanced photocatalytic Cr(VI) reduction performance under white light

Cited by 276 publications

References 79 publications

Construction of Electrostatic Self-Assembled 2D/2D CdIn2S4/g-C3N4 Heterojunctions for Efficient Visible-Light-Responsive Molecular Oxygen Activation

Construction of Electrostatic Self-Assembled 2D/2D CdIn2S4/g-C3N4 Heterojunctions for Efficient Visible-Light-Responsive Molecular Oxygen Activation

Construction of visible‐light‐responsive metal–organic framework with pillared structure for dye degradation and Cr(VI) reduction

Semiconducting Metal–Organic Frameworks Decorated with Spatially Separated Dual Cocatalysts for Efficient Uranium(VI) Photoreduction

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