Self-template synthesis of core–shell ZnO@ZIF-8 nanospheres and the photocatalysis under UV irradiation

Chen, Yuanfu; Wang, Feifei; Dong, Weibing; Hou, Jie; Lu, Pingchao; Gong, Junbo

doi:10.1016/j.matlet.2015.04.142

Cited by 131 publications

(44 citation statements)

References 17 publications

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“…However, a small new band appeared at 1.72 eV (in Figure 14b), which might be due to the presence of trace amount of degraded fragment on the surface of AZ1. In literature, various core-shell composites such as ZnO@ZIF-8, [59] TiO 2 @ZIF-8 [43,44] and SnO 2 @ZIF-8 [45] have been explored as efficient photocatalysts for the degradation of MB. 10 mg of ZnO@ZIF-8 composite degraded 94.1% MB (10 ppm of 20 ml) in the presence of H 2 O 2 (Fenton-like photodegradation) under UV radiation for 4 hr, [59] whereas the present study describes the controlled synthesis of AgNPs@ZIF-11 composite which can degrade 100% MB (1.6 ppm) within 40 min and 3.2 ppm in 60 min using 10 mg catalyst.…”

Section: Recyclability and Reusabilitymentioning

confidence: 99%

Facile Synthesis of Metal–Organic Framework (ZIF‐11) and Ag NPs Encapsulated‐ZIF‐11 Composite as an Effective Heterogeneous Catalyst for Photodegradation of Methylene Blue

Chandra

Nath

2020

Applied Organom Chemis

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Facile synthesis of metal–organic framework based on zeolitic imidazolate (ZIF‐11) has been optimized to get a material with rho topology. For the first time AgNPs in various dosing amounts (using 150, 300 and 500 μL of its suspension in methanol) have been successfully encapsulated within ZIF‐11 matrix at room temperature using binary solvent (methanol and toluene) yielding novel multi‐core‐shell AgNPs@ZIF‐11 (AZ1, AZ2 and AZ3) composites. Encapsulation of AgNPs (particle size: 11.76 ± 2.3 nm) has been confirmed by TEM and ultraviolet diffuse reflectance spectroscopic (UV‐DRS) analysis. The lowering of band gap of ZIF‐11 from 4.36 to 4.21 eV indicates the micro‐environment of AgNPs within ZIF‐11 framework, which has also been ensured by XPS analysis. ZIF‐11 and AgNPs@ZIF‐11 composites are highly stable up to 500 °C under air and N2 atmosphere. It has been found that AZ1 composite exhibits excellent photocatalytic activity (almost 100% degradation) toward MB (1.6 mg/L) at pH ≥ 8. Further, various factors such as loading amount of AgNPs (150, 300 and 500 μL suspension in methanol), amount of catalysts (5 mg, 10 mg and 15 mg) and concentration (1.6 mg L−1, 3.19 mg L−1 and 6.38 mg L−1) of methylene blue (MB) dye during photodegradation experiments have been investigated. The capacious achievement of AZ1 composite is its reusability and recyclability; it can be reutilized up to three cycles with the same efficiency (100%) while under fourth and fifth cycle, it can degrade off 92.12% and 72.75% MB, respectively. AgNPs may act as a mediator to promote the quick transfer of photo‐induced electrons and electron–hole pairs separation in ZIF‐11. This work opens a new type of easily fabricated core‐shell composites utilizing ZIF‐11 for wastewater remediation process.

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Section: Recyclability and Reusabilitymentioning

confidence: 99%

Facile Synthesis of Metal–Organic Framework (ZIF‐11) and Ag NPs Encapsulated‐ZIF‐11 Composite as an Effective Heterogeneous Catalyst for Photodegradation of Methylene Blue

Chandra

Nath

2020

Applied Organom Chemis

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“…The significant change in particle size (Fig. b and d) indicates that 2‐methylimidazole ligands can pass through the pores of the ZIF‐8 crystal and take the surface of the MZnO core, where small MZnO particles are dissolved and dissolved Zn coordinates with organics to form ZIF‐8 .…”

Section: Resultsmentioning

confidence: 99%

Poly(vinylidene difluoride) Membrane Assisted by Modified ZnO/ZIF Nanoparticles for Membrane Distillation

2018

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Poly(vinylidene difluoride) (PVDF) polymeric membranes incorporated by synthesized hydrophobic agents were applied for membrane distillation. ZnO nanoparticles were modified with a silane coupling agent (n‐octyltriethoxysilane) and coupled by zeolite imidazole framework (ZIF)‐8 crystals. In particular, hydrophobic and porous membranes were prepared with ZIF crystals and modified ZnO/ZIF‐coupled nanoparticles. The influences of feed concentration and temperature of NaCl solution and seawater during filtration were evaluated. The hydrophobic modified membranes showed a higher permeate flux than pure PVDF membranes at different feed concentrations and feed temperatures. After modification, the porosity increased significantly and the contact angle became larger.

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“…100 nm. 15 At the same time, it is also different from the ZnO@ZIF-8 obtained by gas-phase deposition; the size of ZnO in the material obtained by this method is subject to the size of the pore channel of ZIF-8, and the content is relatively low. 16 Therefore, in our unique colloidal semiconductor quantum dot synthesis method, 17 we could easily introduce a large amount of ZnO QDs into ZIF-8 and keep their monodisperse and luminescence characteristics (Table S2 †).…”

Section: Introductionmentioning

confidence: 89%

In situ aluminium ions regulation for quantum efficiency and light stability promotion in white light emitting material

Liu

Nie

et al. 2019

RSC Adv.

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Self-template synthesis of core–shell ZnO@ZIF-8 nanospheres and the photocatalysis under UV irradiation

Cited by 131 publications

References 17 publications

Facile Synthesis of Metal–Organic Framework (ZIF‐11) and Ag NPs Encapsulated‐ZIF‐11 Composite as an Effective Heterogeneous Catalyst for Photodegradation of Methylene Blue

Facile Synthesis of Metal–Organic Framework (ZIF‐11) and Ag NPs Encapsulated‐ZIF‐11 Composite as an Effective Heterogeneous Catalyst for Photodegradation of Methylene Blue

Poly(vinylidene difluoride) Membrane Assisted by Modified ZnO/ZIF Nanoparticles for Membrane Distillation

In situ aluminium ions regulation for quantum efficiency and light stability promotion in white light emitting material

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