Seeded-secondary growth synthesis of ZIF-8@porous mullite beads for adsorption of dyes

Zeolite imidazole framework-8 (ZIF-8), serving as a promising adsorbent for wastewater treatment, is limited in practical wastewater treatment due to its polycrystalline powder form resulting in poor recoverability. Herein, the millimeter-scale ZIF-8@porous mullite beads were prepared by the seeded-...

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Bibliographic Details
Published in:Journal of materials science 2023-05, Vol.58 (17), p.7319-7332
Main Authors: Hou, Zhaoping, Tian, Zihan, Zhao, Junming, Yang, Xinhe, Liu, Liangliang
Format: Article
Language:English
Subjects:
Adsorbates
Adsorption
Analysis
Aqueous solutions
Azo compounds
Beads
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Composites & Nanocomposites
Crystallography and Scattering Methods
Crystals
Dyes
Growth
Imidazole
Materials Science
Mullite
Nanocomposites
Pollutants
Polymer Sciences
Powders
Purification
Recoverability
Sewage
Solid Mechanics
Wastewater
Wastewater treatment
Water treatment
Zeolites
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Summary:Zeolite imidazole framework-8 (ZIF-8), serving as a promising adsorbent for wastewater treatment, is limited in practical wastewater treatment due to its polycrystalline powder form resulting in poor recoverability. Herein, the millimeter-scale ZIF-8@porous mullite beads were prepared by the seeded-secondary growth method. The surface of the porous mullite beads is fully encapsulated by nanoscale ZIF-8 crystals, and the ZIF-8 crystals are anchored by mullite whiskers. This composition provides ZIF-8 with a stable macroscopic structure and maintains the exposure of its adsorption sites. Therefore, the ZIF-8@porous mullite beads exhibited good adsorption performance toward methyl orange (MO) and orange G (OG) in the aqueous solution. The analysis of adsorption kinetics indicating the adsorption efficiency of ZIF-8@mullite-w on MO and OG is influenced by the concentration of adsorbates and the adsorption sites. The maximum adsorption of ZIF-8@porous mullite beads on MO and OG was 16.5289 and 5.111 mg/g, respectively.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-023-08484-6