The application of Zeolitic imidazolate frameworks (ZIFs) and their derivatives based materials for photocatalytic hydrogen evolution and pollutants treatment

Yang, Liu; Cheng, Hao; Cheng, Min; Liu, Zhifeng; Huang, Danlian; Zhang, Gaoxia; Shao, Bin; Liang, Qinghua; Luo, Songhao; Wu, Ting; Xiao, Sa

doi:10.1016/j.cej.2020.127914

Cited by 76 publications

(53 citation statements)

References 217 publications

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“…Metal–organic frameworks (MOFs), an emerging class of highly porous materials that consist of metal clusters (or metal ions) and organic ligands, have been extensively studied in the past 3 decades (Figure ). − Due to their unique structural features including permanent porosity, uniform open cavities, high surface area, tunable porous size/shape, and modifiable pore size, MOFs have received particular interest in the field of gas storage, , separation, , and catalysis. , MOFs have been proposed as potential photocatalysts since the late 1990s and the early 2000s. , Notably, both the organic linkers and metal nodes in MOFs can take an important part in the photocatalytic reactions. − It is believed that the organic linkers can behave as light-harvesting units, while the metal clusters/ions can be regarded as isolated semiconductor quantum dots, which can be activated by the organic linkers or excited upon light irradiation. , In addition, due to the availability of a large diversity of organic linkers and metal clusters/ions, as well as their diverse assemblies, the light absorption properties of MOFs can be rationally designed and tailored through a judicious selection of the organic linkers and metal clusters/ions. − Besides, MOFs possess ultrahigh porosity, large surface area, and open channels, which render abundant catalytic sites readily accessible and also greatly facilitate the transport/diffusion of substrates/products, therefore becoming one of the most promising alternatives to conventional photocatalysts. − …”

Section: Introductionmentioning

confidence: 99%

Polyoxometalate@Metal–Organic Framework Composites as Effective Photocatalysts

et al. 2021

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In the recent years, polyoxometalate (POM) encapsulated metal–organic framework (MOF) composites have attracted much attention in photocatalysis. Both POMs and MOFs have been attracting immense attention in this area. Furthermore, in order to promote charge transfer and separation between POMs and MOFs, theoretical and experimental analysis can be applied to match their energy levels; however, their individual applications are hindered by several defects, such as poor visible-light utilization efficiency. The combination of MOFs and POMs can benefit from the virtues of both POMs and MOFs while avoiding the drawbacks of them. Notably, MOFs with high specific surface area and long-range ordered structure ensure a uniform distribution of POMs, which cannot only prevent the self-aggregation of POMs but also allow the exposure of more active sites for catalysis. POM@MOF composites have been identified as promising materials for photocatalysis because of their diverse unique advantages, such as ultrahigh porosity, large specific surface area, and excellent electron redox transformation. In this work, we present an overview of the developments in POM@MOF composite-based catalysts for visible light induced photocatalysis. The strategies employed for the preparation of POM@MOF composites are summarized and discussed with a particular focus on the stability of such materials. The representative works on photocatalytic water splitting, CO2 reduction, degradation of pollutants, and selective oxidation of organics are highlighted. Special attention is paid to the synergistic effects between the MOF and POM that result in an enhanced performance. Besides, the stability and reusability of these materials are also discussed. Also, the unsolved problems and development opportunities of POM@MOF composites in the field of photocatalysis are proposed.

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Section: Introductionmentioning

confidence: 99%

Polyoxometalate@Metal–Organic Framework Composites as Effective Photocatalysts

et al. 2021

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“…Zeolitic imidazolate frameworks (ZIFs), a subfamily of MOFs, made up of metal ions linked by imidazolate derivatives, are effective for a range of applications, including catalysis [5]. Despite their high catalytic activity, monometallic ZIFs are rarely employed in photocatalysis due to their limited photocatalytic activity in most reactions [6]. Their photocatalytic activity can be enhanced by introducing an additional photocatalytic active transition metal to the framework, resulting in a bimetallic catalytic system with hetero active sites [7].…”

Section: Introductionmentioning

confidence: 99%

Ti(IV)-exchanged nano-ZIF-8 and nano-ZIF-67 for Enhanced Photocatalytic Oxidation of Hydroquinone

Mphuthi

Maseme

Langner

2022

Preprint

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The metal centres of nano-ZIF-8(Zn) and nano-ZIF-67(Co) were partially exchanged with titanium centres to form bimetallic nZIF-8(Zn/Ti) (52% Ti4+) and nZIF-67(Co/Ti) (38% Ti4+) respectively, for enhanced photocatalytic performance. A morphological and structural analysis by SEM, EDS-Mapping and PXRD showed that the particle size, distribution, and the structural integrity of the Sodalite frameworks of the parent ZIFs were retained during the exchange process to form the new bimetallic Ti-ZIFs. FTIR confirmed that no additional chemical bonds were formed during the process. XPS binding energies confirmed the preservation of the Zn(II), Co(II) and Ti(IV) oxidation states, as well as the Ti-content, consistent with ICP-OES and EDS measurements. The Ti-exchanged ZIFs showed higher activity during the photocatalytic oxidation of hydroquinone in comparison with their parent ZIFs. Their kinetic rates were nearly five times faster than those of the parent ZIFs, with the first-order rate constants k = 0.189 min-1 for nZIF-8(Zn/Ti) and k = 0.139 min-1 for nZIF-67(Co/Ti). These catalysts are efficient, stable, and reusable for three photocatalytic cycles without a significant loss of catalytic activity.

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“…Additionally, because of its facile synthesis, g-C 3 N 4 having different dimensionalities can be utilized in various applications. − However, single, pure g-C 3 N 4 normally exhibits mediocre photocatalytic activity because of its limited surface active sites and fast recombination of the photoexcited electron–hole pairs . Various methods have therefore been proposed to address these issues, such as dopant introduction, heterojunction formation, , morphological engineering, , metal–organic framework utilization, − modification with noble metals, , and strategies based on conductive anisotropy. , Among these approaches, heterojunction formation with other semiconductors is particularly effective as both efficient charge separation at the interface and light absorption over a wide wavelength range by band gap overlap can be achieved. Specifically, Z -scheme heterojunctions possess additional advantages, such as enhanced redox power and spatial separation of the charge carriers, thereby rendering them suitable for advanced photocatalytic applications. − Up to date, various types of g-C 3 N 4 -based Z -scheme heterojunctions have been developed by combining g-C 3 N 4 with metal oxides, , chalcogenides, phosphides, and sulfides, among others.…”

Section: Introductionmentioning

confidence: 99%

Triple-Channel Charge Transfer over W₁₈O₄₉/Au/g-C₃N₄ Z-Scheme Photocatalysts for Achieving Broad-Spectrum Solar Hydrogen Production

Hong

Chen

Hsu

et al. 2021

ACS Appl. Mater. Interfaces

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Z-scheme heterojunctions are fundamentally promising yet practically appealing for photocatalytic hydrogen (H2) production owing to the enhanced redox power, spatial separation of charge carriers, and broad-spectrum solar light harvesting. The charge-transfer dynamics at Z-scheme heterojunctions can be accelerated by inserting charge-transfer mediators at the heterojunction interfaces. In this study, we introduce Au nanoparticle mediators in the Z-scheme W18O49/g-C3N4 heterostructure, which enables an improved H2 production rate of 3465 μmol/g·h compared with the direct Z-scheme W18O49/g-C3N4 (1785 μmol/g·h) under 1 sun irradiation. The apparent quantum yields of H2 production with W18O49/Au/g-C3N4 are 3.9% and 9.3% at 420 and 1200 nm, respectively. The improved photocatalytic H2 production activity of W18O49/Au/g-C3N4 is attributable to the triple-channel charge-transfer mechanism: channel IZ-scheme charge transfer facilitates charge separation and increased redox power of the photoexcited electrons; channels II and IIIthe localized surface plasmon resonances from Au (channel II) and W18O49 (channel III) enable light harvesting extension from visible to near-infrared wavelengths.

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The application of Zeolitic imidazolate frameworks (ZIFs) and their derivatives based materials for photocatalytic hydrogen evolution and pollutants treatment

Cited by 76 publications

References 217 publications

Polyoxometalate@Metal–Organic Framework Composites as Effective Photocatalysts

Polyoxometalate@Metal–Organic Framework Composites as Effective Photocatalysts

Ti(IV)-exchanged nano-ZIF-8 and nano-ZIF-67 for Enhanced Photocatalytic Oxidation of Hydroquinone

Triple-Channel Charge Transfer over W₁₈O₄₉/Au/g-C₃N₄ Z-Scheme Photocatalysts for Achieving Broad-Spectrum Solar Hydrogen Production

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The application of Zeolitic imidazolate frameworks (ZIFs) and their derivatives based materials for photocatalytic hydrogen evolution and pollutants treatment

Cited by 76 publications

References 217 publications

Polyoxometalate@Metal–Organic Framework Composites as Effective Photocatalysts

Polyoxometalate@Metal–Organic Framework Composites as Effective Photocatalysts

Ti(IV)-exchanged nano-ZIF-8 and nano-ZIF-67 for Enhanced Photocatalytic Oxidation of Hydroquinone

Triple-Channel Charge Transfer over W18O49/Au/g-C3N4 Z-Scheme Photocatalysts for Achieving Broad-Spectrum Solar Hydrogen Production

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Triple-Channel Charge Transfer over W₁₈O₄₉/Au/g-C₃N₄ Z-Scheme Photocatalysts for Achieving Broad-Spectrum Solar Hydrogen Production