ZIF-8 calcination derived Cu<sub>2</sub>O–ZnO* material for enhanced visible-light photocatalytic performance

Yin, Yilin; Liu, Jingchao; Wu, Zengnan; Zhang, Ting; Li, Zenghe

doi:10.1039/d0nj05481j

Cited by 8 publications

(7 citation statements)

References 36 publications

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“…The CoZn@CM catalytic membranes can be produced by the pyrolysis of CoZn-ZIF@ CM under inert atmosphere. As illustrated in Figure 2a, the surface of Co0Zn0.6−920@CM is completely covered by the smooth carbon layer owing to the collapse of ZIF-8 framework and Zn evaporation, 50 which can be observed more intuitively by TEM (SI Figure S3). The surfaces of the other CoZn-920@ CM samples are composed of a large density of tubular carbon structure known as carbon nanotubes (CNTs).…”

Section: Preparation and Characterization Of Cozn@cmmentioning

confidence: 90%

ZIF-Derived Co/Zn Bimetallic Catalytic Membrane with Abundant CNTs for Highly Efficient Reduction of p-Nitrophenol

Jiang

Wang

Chen

et al. 2022

Ind. Eng. Chem. Res.

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Design and synthesis of cheap and high-efficiency catalytic membranes are of great significance for green chemical engineering. Herein, we report a Co/Zn bimetallic catalytic membrane (CoZn@CM) through a selfsacrificial template approach, where Co/Zn zeolitic imidazolate framework (Co/ Zn-ZIF) was first in situ grown on the ceramic membrane (CM) and then pyrolyzed under Ar atmosphere. Adjusting the Co 2+ concentration during the synthesis of Co/Zn-ZIF@CM and the pyrolysis temperature can achieve the catalytic membrane of CoZn@CM with rich carbon nanotubes (CNTs) on the membrane, lots of Co nanoparticles with a smaller particle size and a large number of mesopores, thereby improving its catalytic activity for the liquid-phase p-nitrophenol hydrogenation to p-aminophenol in a flow-through catalytic membrane reactor. The as-fabricated Co0.2Zn0.4−920@CM exhibits excellent catalytic activity, which is about 2.7 times that of Co0Zn0.6−920@CM and 2.4 times that of Co0.2Zn0.4−770@CM. Moreover, Co0.2Zn0.4−920@CM can keep its catalytic performance after five reaction cycles of p-nitrophenol hydrogenation.

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Section: Preparation and Characterization Of Cozn@cmmentioning

confidence: 90%

ZIF-Derived Co/Zn Bimetallic Catalytic Membrane with Abundant CNTs for Highly Efficient Reduction of p-Nitrophenol

Jiang

Wang

Chen

et al. 2022

Ind. Eng. Chem. Res.

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“…Zn 2p 3/2 of ZIF-8 is deconvoluted into two peaks, attributed to the Zn N bond at 1020.94 eV and the Zn O bond at 1021.48 eV. 55,56 In the presence of ZIF-8 (MO) and ZIF-8 (MB), the Zn N bond seems to be replaced by the Zn O bond. Thus, ZIF-8 undergoes partial hydrolysis in the reaction media, following the detection of Zn O peaks at 1021.43 eV for ZIF-8 (MO) and at 1021.48 eV for ZIF-8 (MB).…”

Section: Nitrogen Adsorption Isothermsmentioning

confidence: 99%

Adsorption and photoactivity performances of copper(II)–benzene‐1,3,5‐tricarboxylate (Cu‐BTC) and zeolitic imidazolate framework (ZIF‐8): effect of humidity

Tuncel,

Ökte

2023

J of Chemical Tech & Biotech

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BACKGROUNDIn this study, adsorption properties and photocatalytic activities of Cu‐BTC and ZIF‐8 are explored using an anionic dye, methyl orange (MO) and a cationic dye, methylene blue (MB). Effect of humidity on the stabilities and performances of Cu‐BTC and ZIF‐8 is controlled under 40%, 67% and 84% relative humidity (RH) conditions. Cu‐BTC, ZIF‐8 and humidified samples are characterized by various techniques.RESULTSHumidified samples do not exhibit new X‐ray diffraction (XRD) peaks and significant variations in the Scanning electron microscopy (SEM) images and UV‐Vis diffuse reflectance (UV‐Vis DRS) spectra. After degradation experiments, XRD, X‐ray photoelectron spectra (XPS) and UV‐Vis DRS confirm the coexistence of Cu1+ and Cu2+ in Cu‐BTC and the formation of ZnO in ZIF‐8. Reduction in surface area (BET) measurements and detection of N and S signals in energy dispersive X‐ray (EDX) analysis prove interaction of MO and MB. Adsorptions of MO and MB are proposed via electrostatic attraction, Π‐Π interaction, and hydrogen bonding and conform to pseudo‐second order kinetics. Langmuir and Freudlich models describe the adsorption isotherms of MO and MB. Ligand‐to‐metal charge transfer process is principally responsible for the photoactivities of Cu‐BTC and ZIF‐8. Cu‐BTC (84% RH) and ZIF‐8 (84% RH) exhibit the highest performances, following the Langmuir–Hinshelwood kinetics. Stability tests of Cu‐BTC, ZIF‐8 and humidified samples imply their reuse abilities.CONCLUSIONThis study correlates structural characteristics and adsorption abilities/photocatalytic performances of Cu‐BTC and ZIF‐8. Results may offer new ideas into improvement of MOFs as adsorbents and photocatalysts.This article is protected by copyright. All rights reserved.

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“…fabricated porous Cu 2 O−ZnO by pyrolysis of zeolitic imidazolate framework−8. The sample exhibited reliable photodegradation of tetracycline hydrochloride and PEC reactions under visible light illumination 46 . Zhang et al.…”

Section: Introductionmentioning

confidence: 96%

“…The sample exhibited reliable photodegradation of tetracycline hydrochloride and PEC reactions under visible light illumination. 46 Zhang et al fabricated Cu 2 O−ZnO core shells on γ-Al 2 O 3 /Al substrates using impregnation method. The sample exhibited the catalytic stability in methanol steam reforming.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal fabrication of p‐Cu₂O−n‐ZnO films and their properties for photodegradation and ultraviolet sensors

Chang

2022

J Am Ceram Soc.

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This article reports spin coating and hydrothermal approaches to the synthesis of Cu2O seed layer−ZnO and Cu2O film−ZnO heterojunction films on fluorine‐doped tin oxide substrates. Cu2O seed layers and an ethylene glycol (EG) reducing agent were employed to obtain pure, uniform, and adhesive Cu2O films on the substrate. Transmission electron microscopy validated the heterojunctions with clear interfaces between each component on the p‐Cu2O film−n‐ZnO (with EG) sample, the conductive types of which were determined through Mott−Schottky measurements. Constructed energy band diagrams supported the Mott−Schottky result, manifesting favorable conduction band positions for the generation of •O2− radicals for all constituent materials and indicating smooth charge carrier transport for the p‐Cu2O film−n‐ZnO (with EG) sample. Furthermore, abundant p−n junction interfaces synergistically enabled the sample to exhibit the most satisfactory photodegradation capability (rate constant ≈ 8.9 × 10−3 min−1), which was attributable to the predominance of •OH radicals. The sample's rectifying (diode) behavior with a ratio of the current density (J) at +3 V (forward bias) to that at −3 V (reverse bias) of approximately 27 was observed without ultraviolet illumination. Moreover, the J at −3 V is under illumination approximately 80 times that without illumination, implying the suitability of the sample for UV detectability.

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ZIF-8 calcination derived Cu₂O–ZnO* material for enhanced visible-light photocatalytic performance

Abstract: The mechanism of TC degradation over Cu2O–ZnO* rich in oxygen vacancies.

Cited by 8 publications

References 36 publications

ZIF-Derived Co/Zn Bimetallic Catalytic Membrane with Abundant CNTs for Highly Efficient Reduction of p-Nitrophenol

ZIF-Derived Co/Zn Bimetallic Catalytic Membrane with Abundant CNTs for Highly Efficient Reduction of p-Nitrophenol

Adsorption and photoactivity performances of copper(II)–benzene‐1,3,5‐tricarboxylate (Cu‐BTC) and zeolitic imidazolate framework (ZIF‐8): effect of humidity

Hydrothermal fabrication of p‐Cu₂O−n‐ZnO films and their properties for photodegradation and ultraviolet sensors

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ZIF-8 calcination derived Cu2O–ZnO* material for enhanced visible-light photocatalytic performance

Abstract: The mechanism of TC degradation over Cu2O–ZnO* rich in oxygen vacancies.

Cited by 8 publications

References 36 publications

ZIF-Derived Co/Zn Bimetallic Catalytic Membrane with Abundant CNTs for Highly Efficient Reduction of p-Nitrophenol

ZIF-Derived Co/Zn Bimetallic Catalytic Membrane with Abundant CNTs for Highly Efficient Reduction of p-Nitrophenol

Adsorption and photoactivity performances of copper(II)–benzene‐1,3,5‐tricarboxylate (Cu‐BTC) and zeolitic imidazolate framework (ZIF‐8): effect of humidity

Hydrothermal fabrication of p‐Cu2O−n‐ZnO films and their properties for photodegradation and ultraviolet sensors

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ZIF-8 calcination derived Cu₂O–ZnO* material for enhanced visible-light photocatalytic performance

Hydrothermal fabrication of p‐Cu₂O−n‐ZnO films and their properties for photodegradation and ultraviolet sensors