Tuning the crystal morphology and size of zeolitic imidazolate framework-8 in aqueous solution by surfactants

Pan, Yichang; Heryadi, Dodi; Zhou, Feng; Zhao, Lan; Lestari, Gabriella; Su, Haibin; Lai, Zhiping

doi:10.1039/c1ce05780d

Cited by 388 publications

(315 citation statements)

References 47 publications

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“…We further investigated composite formation after pre-coating the ZnO particles in cetyl-trimethylammonium bromide (CTAB), a single chain cationic surfactant that has previously been reported to influence ZIF-8 crystal size and morphology in standard (solvothermal) syntheses from metal salts. 25 In the presence of CTAB the degree of ZnO to ZIF-8 conversion is 1.6 times higher than that obtained with C 12 Gua under identical conditions, and SEM images indicate the microspherical shape is largely destroyed. (Figure S22, S23) This is in agreement with those composites prepared in the absence of any surfactant stabiliser ( Figure S10, S16, S17) and suggests that CTAB does not interact as strongly as C 12 Gua with the ZnO surface, further confirming the critical role of the guanidinium-based amphiphile in core-shell composite morphology control through oxide surface passivation.…”

Section: Resultsmentioning

confidence: 99%

Surfactant-assisted ZnO processing as a versatile route to ZIF composites and hollow architectures with enhanced dye adsorption

2016

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a Metal oxides can be used as hard sacrificial templates for the preparation of multifunctional core-shell MOF-based composites following reaction with the organic linker. This is a facile method, but often structures of well-defined shape are only obtained under narrow ranges of conditions, the shape can be lost completely and low levels of MOF conversion observed. Using the prototypical framework ZIF-8 we present an alternative surfactant-assisted surface passivation strategy where the ZnO precursor particles are first coated with a guanidinium-based amphiphile. The surfactant interacts strongly with the oxide surface and allows fine-tuning of the release of Zn(II) and ZIF-8 nucleation by the level of surface coverage permitting a range of well-defined ZnO@ZIF-8 core-shell architectures to be prepared including in water. Further, selective base-etching of the oxide core provides facile access to hollow ZIF-8 and yolk-shell structures. We also demonstrate enhanced dye adsorption and recovery from aqueous mixtures using ZnO@ZIF-8 composite microspheres..

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Section: Resultsmentioning

confidence: 99%

Surfactant-assisted ZnO processing as a versatile route to ZIF composites and hollow architectures with enhanced dye adsorption

2016

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“…Further secondary growth promotes the well-intergrown of grains with rhombic dodecahedral shapes (Pan et al, 2011a), resulting in the formation of continuous ZIF-8 membrane with random orientation (Fig. 1a and 1e).…”

Section: Gas Permeationmentioning

confidence: 99%

ZIF-8 membranes with improved reproducibility fabricated from sputter-coated ZnO/alumina supports

Pan

Wang

et al. 2016

Chemical Engineering Science

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Zeolitic imidazolate framework-8 (ZIF-8) membrane has shown great potential for propylene/propane separation based on molecular sieving mechanism. Although diverse synthesis strategies were applied to prepare ZIF-8 membranes, it is still a challenge for reproducible fabrication of high-quality membranes. In this study, high-quality ZIF-8 membranes were prepared through hydrothermal synthesis under the partial self-conversion of sputter-coated ZnO layer on porous α-alumina supports.The reproducibility was significantly improved, compared with that from sol-gel coated ZnO layer, due to the highly controllable sputtering deposition of ZnO precursor. The relationship between the quality of as-synthesized membrane and amount of deposited ZnO was also determined. The effect of pressure drop in C 3 H 6 /C 3 H 8 separation on separating performance was also examined.

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“…21 Therefore, increasing effort has recently been devoted to developing green approaches without using any organic solvents to prepare ZIF-8. Although, several modied syntheses methods with adding modulating agents have been reported to promote the formation and tune textural property of ZIF-8 material, 17,22,23 it still remains a challenge to synthesize pure ZIF-8 crystals with highly regular particle morphology in water at room temperature without using any additives. Pan et al rst reported the successful synthesis of ZIF-8 in water at room temperature without using any additives.…”

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Water-based synthesis of zeolitic imidazolate framework-8 with high morphology level at room temperature

et al. 2015

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In this study, the synthesis of zeolitic imidazole framework (ZIF-8) in water was systematically studied using 6 zinc sources (Zn(OAc) 2 , ZnSO 4 , Zn(NO 3 ) 2 , ZnCl 2 , ZnBr 2 , ZnI 2 ), respectively, under different conditions at room temperature without using any additives. It was found that Zn(OAc) 2 is the best precursor and the resultant ZIF-8 particles have the best quality with rhombic dodecahedron morphology. The concentration of 2-methylimidazole (Hmim), molar ratio Hmim/Zn and water content all have significant impacts on the morphology, particle size, and crystallinity of ZIF-8. Further result analysis reveals that 3 key reactions are involved in the ZIF-8 formation which needs five steps in ZIF-8 structural evolution.This study provides a deep understanding of the crystallization process of ZIF-8 particles in a waterbased system.

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Tuning the crystal morphology and size of zeolitic imidazolate framework-8 in aqueous solution by surfactants

Cited by 388 publications

References 47 publications

Surfactant-assisted ZnO processing as a versatile route to ZIF composites and hollow architectures with enhanced dye adsorption

Surfactant-assisted ZnO processing as a versatile route to ZIF composites and hollow architectures with enhanced dye adsorption

ZIF-8 membranes with improved reproducibility fabricated from sputter-coated ZnO/alumina supports

Water-based synthesis of zeolitic imidazolate framework-8 with high morphology level at room temperature

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