Fabrication of a novel core–shell CQDs@ZIF-8 composite with enhanced photocatalytic activity

Si, Yunhui; Li, Xiaorong; Yang, Guie; Mie, Xiaoli; Ge, Laobao

doi:10.1007/s10853-020-04909-8

Cited by 53 publications

(28 citation statements)

References 48 publications

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“…The peaks for the deposited ZIF-8 MAPLE thin film were slightly shifted towards lower energies, i.e., 1021.03, 531.19, 398.42, and 284.34 eV, respectively. The C1s spectrum was deconvoluted in four peaks, attributed to C–C, C–N, C–O or C–N, and C–OH bonds [ 61 ]. Traces of methanol were also identified for the MAPLE samples.…”

Section: Resultsmentioning

confidence: 99%

Thin Films of Metal-Organic Framework Interfaces Obtained by Laser Evaporation

et al. 2021

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Properties such as large surface area, high pore volume, high chemical and thermal stability, and structural flexibility render zeolitic imidazolate frameworks (ZIFs) well-suited materials for gas separation, chemical sensors, and optical and electrical devices. For such applications, film processing is a prerequisite. Herein, matrix-assisted pulsed laser evaporation (MAPLE) was successfully used as a single-step deposition process to fabricate ZIF-8 films. By correlating laser fluency and controlling the specific transfer of lab-synthesized ZIF-8, films with user-controlled physical and chemical properties were obtained. Films’ characteristics were evaluated by scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The analysis showed that frameworks of ZIF-8 can be deposited successfully and controllably to yield polycrystalline films. The deposited films maintained the integrity of the individual ZIF-8 framework, while undergoing minor crystalline and surface chemistry changes. No significant changes in particle size were observed. Our study demonstrated control over both the MAPLE deposition conditions and the outcome, as well as the suitability of the listed deposition method to create composite architectures that could potentially be used in applications ranging from selective membranes to gas sensors.

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Section: Resultsmentioning

confidence: 99%

Thin Films of Metal-Organic Framework Interfaces Obtained by Laser Evaporation

et al. 2021

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“…The adsorption of organic pollutants on catalysts and the active species produced in the photocatalyst are important factors that affect the catalytic degradation performance. The photocatalytic degradation efficiency can also be improved by rationally designing the catalyst structure 55 . In this work, the ZIF‐8 crystal was embedded into the porous organic polymer walls and matrices, and the interconnected macroporous structure of the substrate material was used as a channel to transport pollutant molecules, thereby increasing the contact area between pollutant molecules and ZIF‐8 crystallites and providing increased active sites for the effective decomposition of pollutant molecules.…”

Section: Resultsmentioning

confidence: 99%

In situ growth of the ZIF‐8 on the polymer monolith via CO₂‐in‐water HIPEs stabilized using metal oxide nanoparticles and its photocatalytic activity

Niu

Cao

Yang

et al. 2021

Polymers for Advanced Techs

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Here, the ZnO/polyacrylamide (ZnO/PAM) macroporous composite monolith was first prepared through the radical polymerization of acrylamide in ZnO‐costabilized CO2‐in‐water Pickering high internal phase emulsions (HIPEs). An efficient and green synthesis method was used to prepare the ZnO/PAM porous precursor materials, and ZnO nanoparticles (NPs) were used as a metal ion source to grow the metal organic frameworks (MOF) phase through secondary recrystallization, thereby synthesizing the target MOF/PAM porous monolith. The effects of the contents of ZnO NPs on the formation of HIPEs and properties of the target MOF/PAM composites for the photocatalytic degradation of cationic dye were studied. As the content of ZnO NPs increased to 3.75 wt%, the composite monolith had high mechanical stress (0.24 MPa) at 80% strain and recovered their shape. The as‐synthesized ZIF‐8/PAM composites were characterized using X‐ray diffraction, scanning electron microscope (SEM), Brunauer Emmett Teller (BET), energy dispersive X‐ray spectrometer (EDS) mapping, and TG methods. SEM images showed that the hybrid materials were interconnected, and the sizes of the open macropore and interconnected pore throats were 30–125 and about 2–20 μm, respectively. In addition, the ZIF‐8/PAM material could be used as a high‐efficiency photocatalyst to remove the cationic dye at a fast rate (88.6%).

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“…[142,143] The composites of CQDs with metal-organic frameworks (MOF) also received tremendous attention of scientific research. For instance, Si et al [144] prepared CQDs/ZIF-8 MOF composite via the facile impregnation method and employed in photocatalysis for pollutant degradation. In the designed CQDs/ZIF-8 composite, CQDs served as photosensitizers and extended the visible light response of the photocatalyst.…”

Section: Carbon Quantum Dots (Cqds) Compositesmentioning

confidence: 99%

Recent Progress in the Synthesis and Applications of Composite Photocatalysts: A Critical Review

2021

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concentration for March 2021 was 417.14 parts per million (ppm), which is about 50% higher than the average for pre-industrial levels (i.e., 278 ppm). In order to control global warming, the CO 2 emission must fall by 25% to keep the temperature below 2 °C threshold relative to the pre-industrial climate. [3,4] Among the existing numerous renewable and sustainable energy resources such as wind, solar, hydropower, geo-thermal and ocean-energy, the consumption of unlimited solar energy become a vital alternative energy source, and has been extensively explored during the past few decades. [5] For instant, solar energy could be employed practically in photocatalysis for water splitting to generate hydrogen, carbon dioxide conversion to value added products, and pollutant oxidation. [6][7][8] Photocatalysis has advantage over conventional biological, incineration, electrocatalytic, adsorption, and air stripping treatment techniques because these methods always exhibit shortfalls such as instability, catalyst poisoning, low production yield, poor mechanical strength, time consuming, and electrode corrosion. [9,10] Generally, the photocatalytic process involves several essential steps such as the light absorption by photocatalyst to generate charge carriers, charge carrier's separation and migration to the photocatalyst surface, and the surface redox reactions to transform solar energy into chemical energy. [11,12] If these essential steps are satisfied by a proficient photocatalyst, then of course, high photocatalytic efficiency could be expected. Generally, the fundamental features of a photocatalyst include appropriate band gaps with their corresponding valence and conduction band potentials, surface active sites, surface area, and optical absorption behavior that govern the efficiency and effectiveness of photocatalytic processes. [13,14] Since the photocatalytic reactions are typically performed in water and air environments, therefore, the photocatalyst stability could be crucial under these circumstances. [15] Fujishima and Honda performed water splitting reaction for the first time in 1972, while utilizing TiO 2 photoanode with the aid of Pt as a counter electrode. [16] Afterward, TiO 2 photocatalyst received marvelous attention in photocatalysis owing to its promising features such as its non-toxic nature, water insolubility, nature abundant, hydrophilicity, high stability, and appropriate valence and conduction band potentials for redox reactions. [17] Yet, the Photocatalysis is an advanced technique that transforms solar energy into sustainable fuels and oxidizes pollutants via the aid of semiconductor photo catalysts. The main scientific and technological challenges for effective photocatalysis are the stability, robustness, and efficiency of semiconductor photocatalysts. For practical applications, researchers are trying to develop highly efficient and stable photocatalysts. Since the literature is highly scattered, it is urgent to write a critical review that summarizes the stateof theart progress in the ...

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Fabrication of a novel core–shell CQDs@ZIF-8 composite with enhanced photocatalytic activity

Cited by 53 publications

References 48 publications

Thin Films of Metal-Organic Framework Interfaces Obtained by Laser Evaporation

Thin Films of Metal-Organic Framework Interfaces Obtained by Laser Evaporation

In situ growth of the ZIF‐8 on the polymer monolith via CO₂‐in‐water HIPEs stabilized using metal oxide nanoparticles and its photocatalytic activity

Recent Progress in the Synthesis and Applications of Composite Photocatalysts: A Critical Review

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Fabrication of a novel core–shell CQDs@ZIF-8 composite with enhanced photocatalytic activity

Cited by 53 publications

References 48 publications

Thin Films of Metal-Organic Framework Interfaces Obtained by Laser Evaporation

Thin Films of Metal-Organic Framework Interfaces Obtained by Laser Evaporation

In situ growth of the ZIF‐8 on the polymer monolith via CO2‐in‐water HIPEs stabilized using metal oxide nanoparticles and its photocatalytic activity

Recent Progress in the Synthesis and Applications of Composite Photocatalysts: A Critical Review

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In situ growth of the ZIF‐8 on the polymer monolith via CO₂‐in‐water HIPEs stabilized using metal oxide nanoparticles and its photocatalytic activity