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Metal oxide assisted preparation of core–shell beads with dense metal–organic framework coatings for the enhanced extraction of organic pollutants


del Rio, M and Cabello, CP and Gonzales, V and Maya, F and Parra, JB and Cerda, V and Palomino, GT, Metal oxide assisted preparation of core-shell beads with dense metal-organic framework coatings for the enhanced extraction of organic pollutants, Chemistry - A European Journal, 22, (33) pp. 11770 - 11777. ISSN 0947-6539 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

DOI: doi:10.1002/chem.201601329


Dense and homogeneous metal–organic framework (MOF) coatings on functional bead surfaces are easily prepared by using intermediate sacrificial metal oxide coatings containing the metal precursor of the MOF. Polystyrene (PS) beads are coated with a ZnO layer to give ZnO@PS core–shell beads. The ZnO@PS beads are reactive in the presence of 2‐methylimidazole to transform part of the ZnO coating into a porous zeolitic imidazolate framework‐8 (ZIF‐8) external shell positioned above the internal ZnO precursor shell. The obtained ZIF‐8@ZnO@PS beads can be easily packed in column format for flow‐through applications, such as the solid‐phase extraction of trace priority‐listed environmental pollutants. The prepared material shows an excellent permeance to flow when packed as a column to give high enrichment factors, facile regeneration, and excellent reusability for the extraction of the pollutant bisphenol A. It also shows an outstanding performance for the simultaneous enrichment of mixtures of endocrine disrupting chemicals (bisphenol A, 4‐tert‐octylphenol and 4‐n‐nonylphenol), facilitating their analysis when present at very low levels (<1 μg L−1) in drinking waters. For the extraction of the pollutant bisphenol A, the prepared ZIF‐8@ZnO@PS beads also show a superior extraction and preconcentration capacity to that of the PS beads used as precursors and the composite materials obtained by the direct growth of ZIF‐8 on the surface of the PS beads in the absence of metal oxide intermediate coatings.

Item Details

Item Type:Refereed Article
Keywords:metal-organic frameworks, chromatography, core–shell spheres, solid-phase extraction, water analysis, zinc oxide
Research Division:Chemical Sciences
Research Group:Inorganic chemistry
Research Field:Metal organic frameworks
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the chemical sciences
UTAS Author:Maya, F (Mr Fernando Maya Alejandro)
ID Code:127839
Year Published:2016
Web of Science® Times Cited:22
Deposited By:Chemistry
Deposited On:2018-08-19
Last Modified:2022-08-22

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