MOF-derived C-doped ZnO prepared via a two-step calcination for efficient photocatalysis

Pan, Lun; Tahir, Muhammad Nawaz; Ma, Liang; Huang, Zhen‐Feng; Wang, Songbo; Wang, Li; Zou, Ji‐Jun; Zhang, Xiangwen

doi:10.1016/j.apcatb.2016.02.066

Cited by 317 publications

(106 citation statements)

References 52 publications

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“…65‐3288). In such strategy, heating program is the only controllable parameter to manipulate the size of MOFs derivates, whereas high temperatures required usually results in particles of larger crystalline sizes. For instance, the particle size of CuO x (CuO as the indicator) derived from pristine Cu 3 (BTC) 2 was up to 18.6 nm (Figure b).…”

Section: Resultsmentioning

confidence: 99%

Well‐Defined Cu₂O/Cu₃(BTC)₂ Sponge Architecture as Efficient Phenolics Scavenger: Synchronous Etching and Reduction of MOFs in confined‐pH NH₃⋅H₂O

Jia

Zhuang

et al. 2019

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Fabrication of low‐dimensional nano‐MOFs as well as nanoparticles/metal‐organic frameworks (MOFs) hybrids has sparked new scientific interests but remains a challenging task. Taking Cu3(BTC)2 as a proof of concept, it is demonstrated thats NH3⋅H2O solution of a confined pH value can readily shape the bulk Cu3(BTC)2 into nanoscale Cu3(BTC)2, beyond the need to control the crystal growth kinetics of MOFs. Adjusting the pH of NH3⋅H2O within a much small range (10–11) allows fine tuning over the size and shape of nanoscale Cu3(BTC)2. Particularly at pH = 11, NH3⋅H2O exhibits weak reducibility that triggers a reduction of part of Cu3(BTC)2 into Cu2O, while shaping the other into Cu3(BTC)2 nanowires. Benefiting from the coincidence of reduction and etching effects, the newly generated Cu2O dots can in situ anchor onto adjacent Cu3(BTC)2 nanowires at highly dispersive state, forming a well‐defined sponge‐like architecture built of Cu2O dots and nano‐Cu3(BTC)2. The CuOx derived from annealing of the Cu2O dots/nano‐Cu3(BTC)2 hybrid preserves the sophisticated sponge architecture and high porosity, and exhibits promising applications in phenol scavenging, with efficiency outperforming its counterparts and many other Cu‐based catalysts reported in literature. It is anticipated that the findings here pave the way for the rational design of intricate nano‐MOFs in a more efficient way.

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Section: Resultsmentioning

confidence: 99%

Well‐Defined Cu₂O/Cu₃(BTC)₂ Sponge Architecture as Efficient Phenolics Scavenger: Synchronous Etching and Reduction of MOFs in confined‐pH NH₃⋅H₂O

Jia

Zhuang

et al. 2019

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“…The results of XRD showt hat the as-obtained ZIF-8 has similar characteristic peaks to the simulated pure phase (see the Supporting Information, Figure S1). [29] After calcination, the diffraction peaks for the resultant ZIF-8-C shift towards higher2 q valuesi nc omparison with ZIF-8, indicating that calcination at high temperature leads to shrinkage of the ZIF-8 lattice while maintaining the crystal structure. Scanning electron microscopy (SEM;F igure S2) also shows that the morphology of ZIF-8-C, obtained through pyrolysis, inherits the structure of ZIF-8 to some extent.…”

Section: Physiochemicalc Haracterizationsmentioning

confidence: 97%

“…The specific calculation details were given in ap revious report. [29] Typically,z inc acetate dehydrate (5.2520 g) was dissolved in deionized water (24.0 mL) and 2-methyl-1H-imidazole (3.2850 g) was dissolved in 25 wt %a queous ammonia solution (48.5 mL). In calculations of the adsorption energy, Ni 3 ZnC 0.7 /C 5 N 1 features are clarified.…”

Section: Experimental Section Calculation Detailsmentioning

confidence: 99%

“…[48] Synthesis of ZIF-8 and ZIF-8-C ZIF-8 was synthesized by ap reviously reported impregnation method. [29] Typically,z inc acetate dehydrate (5.2520 g) was dissolved in deionized water (24.0 mL) and 2-methyl-1H-imidazole (3.2850 g) was dissolved in 25 wt %a queous ammonia solution (48.5 mL). Then, the zinc acetate solution was added dropwise to the 2-methyl-1H-imidazole solution.…”

Section: Experimental Section Calculation Detailsmentioning

confidence: 99%

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Highly Dispersed Metal Carbide on ZIF‐Derived Pyridinic‐N‐Doped Carbon for CO₂ Enrichment and Selective Hydrogenation

Cai

Chen

et al. 2018

ChemSusChem

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Catalytic conversion of CO into chemicals is a critical issue for energy and environmental research. Among such reactions, converting CO into CO has been regarded as a significant foundation to generate a liquid fuels and chemicals on a large scale. In this work, zeolitic imidazolate framework-derived N-doped carbon-supported metal carbide catalysts (M/ZIF-8-C; M=Ni, Fe, Co and Cu) with highly dispersed metal carbide were prepared for selective CO hydrogenation. Under the same metal loadings, catalytic activity for CO hydrogenation to CO follows the order: Ni/ZIF-8-C≈Fe/ZIF-8-C>Co/ZIF-8-C>Cu/ZIF-8-C. These catalysts are composed of carbide or metal supported on pyridinic N sites within the N-doped carbon structure. ZIF-8-derived pyridinic nitrogen and carbide effect CO adsorption, whereas dispersed Ni or Fe carbide and metal species serve as an active site for CO hydrogenation. The supported Ni catalyst exhibits extraordinary catalytic performance, which results from high dispersion of the metal and exposure of the carbide. Based on high-sensitivity low-energy ion scattering (HS-LEIS) and line scan results, density functional theory (DFT) was used to understand reaction mechanism of selective CO hydrogenation over Ni/ZIF-8-C. The product CO is derived mainly from the direct cleavage of C-O bonds in CO * rather than decomposition of COOH*. The CO* desorption energy on Ni/ZIF-8-C is lower than that for further hydrogenation and dissociation. Comparison of Ni/ZIF-8-C with ZIF-8-C indicates that the combined effects of the highly dispersed metal or carbide and weak CO adsorption result in high CO selectivity for CO hydrogenation.

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“…[1][2][3] Until now, many attempts have been made to improve the photocatalytic activity of these structures such as doping, metal nanoparticle depositing, cocatalyst or sensitizer modication, copolymerization, catalyst carrier and semiconductor combination. [4][5][6][7][8][9][10] Because of the similar ionic radii of Zn and Mg, Mg-doping can signicantly enhance the photocatalytic activity of ZnO nanostructures by forming oxygen or zinc vacancies. 11 However, Mg-doped ZnO nanostructures still possess very high recombination rate of photo-induced electrons.…”

Section: Introductionmentioning

confidence: 99%

Enhanced sunlight-driven photocatalytic property of Mg-doped ZnO nanocomposites with three-dimensional graphene oxide/MoS₂ nanosheet composites

Chen

Wei

et al. 2018

RSC Adv.

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a Graphene oxide (GO) has been the focus of attention as it can enhance the photocatalytic activity of semiconductors due to its large specific surface area and remarkable optical and electronic properties.However, the enhancing effect is not ideal because of its easy self-agglomeration and low electronic conductivity. To improve the enhancing effect of GO for ZnO, three-dimensional GO/MoS 2 composite carriers (3D GOM) were prepared by electrostatic interactions and then, Mg-doped ZnO nanoparticles (MZ) were supported on the surface of 3D GOM by utilizing the layer-by-layer assembly method.Compared with GO/Mg-ZnO composite (GOMZ), the resultant three-dimensional GO/MoS 2 /Mg-ZnO composite (GOMMZ) exhibited excellent photocatalytic performance due to the effective synergistic effect between GO and MoS 2 sheet, and its degradation rate was nearly 100% within 120 min of exposure to visible light; this degradation rate was nearly 8 times higher than that of the GOMZ composite. Moreover, the introduction of the MoS 2 sheet intensified the photocurrent density of the GOMZ composite and endowed it with optical memory ability.

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MOF-derived C-doped ZnO prepared via a two-step calcination for efficient photocatalysis

Cited by 317 publications

References 52 publications

Well‐Defined Cu₂O/Cu₃(BTC)₂ Sponge Architecture as Efficient Phenolics Scavenger: Synchronous Etching and Reduction of MOFs in confined‐pH NH₃⋅H₂O

Well‐Defined Cu₂O/Cu₃(BTC)₂ Sponge Architecture as Efficient Phenolics Scavenger: Synchronous Etching and Reduction of MOFs in confined‐pH NH₃⋅H₂O

Highly Dispersed Metal Carbide on ZIF‐Derived Pyridinic‐N‐Doped Carbon for CO₂ Enrichment and Selective Hydrogenation

Enhanced sunlight-driven photocatalytic property of Mg-doped ZnO nanocomposites with three-dimensional graphene oxide/MoS₂ nanosheet composites

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MOF-derived C-doped ZnO prepared via a two-step calcination for efficient photocatalysis

Cited by 317 publications

References 52 publications

Well‐Defined Cu2O/Cu3(BTC)2 Sponge Architecture as Efficient Phenolics Scavenger: Synchronous Etching and Reduction of MOFs in confined‐pH NH3⋅H2O

Well‐Defined Cu2O/Cu3(BTC)2 Sponge Architecture as Efficient Phenolics Scavenger: Synchronous Etching and Reduction of MOFs in confined‐pH NH3⋅H2O

Highly Dispersed Metal Carbide on ZIF‐Derived Pyridinic‐N‐Doped Carbon for CO2 Enrichment and Selective Hydrogenation

Enhanced sunlight-driven photocatalytic property of Mg-doped ZnO nanocomposites with three-dimensional graphene oxide/MoS2 nanosheet composites

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Product

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Well‐Defined Cu₂O/Cu₃(BTC)₂ Sponge Architecture as Efficient Phenolics Scavenger: Synchronous Etching and Reduction of MOFs in confined‐pH NH₃⋅H₂O

Well‐Defined Cu₂O/Cu₃(BTC)₂ Sponge Architecture as Efficient Phenolics Scavenger: Synchronous Etching and Reduction of MOFs in confined‐pH NH₃⋅H₂O

Highly Dispersed Metal Carbide on ZIF‐Derived Pyridinic‐N‐Doped Carbon for CO₂ Enrichment and Selective Hydrogenation

Enhanced sunlight-driven photocatalytic property of Mg-doped ZnO nanocomposites with three-dimensional graphene oxide/MoS₂ nanosheet composites