title: Simple fabrication of zeolitic imidazolate framework ZIF-8/polymer composite beads by phase inversion method for efficient oil sorption.
abstract: Zeolitic imidazolate framework ZIF-8 beads of 2-3mm in diameter were prepared using a simple one-step phase inversion method. The beads were fabricated by different amounts of ZIF-8 to polyether sulfone (PES) ratios. ZIF-8 played the role of an adsorbent while PES acted as a binder in the composite matrix to keep the ZIF-8 particles. Since ZIF-8 is highly hydrophobic, the beads floated on water and adsorbed oil droplets successfully. This efficient oil adsorption is attributed to the hydrophobicity and high surface area of ZIF-8 particles which can effectively adsorb oil droplets. Different characterization techniques were used to understand the textural properties of the composite beads. The FESEM analysis showed that ZIF-8 particles were well coated and dispersed into the polymer bead composites and some pores are created on the beads surface at higher loadings which facilitated high oil sorption. The nitrogen adsorption-desorption indicated that ZIF-8/PES beads had very high surface area which makes them suitable for adsorption applications. The ZIF-8/PES beads demonstrate easy handling and recycling compared to ZIF-8 powder and showed superior buoyancy and oil sorption capacity compared with natural sorbents like activated carbon. This study shows the phase inversion method can be applied to produce a variety of functional composite bead materials for specific applications like adsorption.
authors.affiliation: Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Abbasi
authors.affiliation: Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia.
authors.forename: Ezzatollah
authors.initials: E
authors.lastname: Shamsaei
authors.affiliation: Monash Center for Electron Microscopy, Monash University, Clayton, Victoria 3800, Australia.
authors.forename: Xi-Ya
authors.initials: XY
authors.lastname: Fang
authors.affiliation: Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia; Barrer Centre, Department of Chemical Engineering, Imperial College London, London SW7 2AZ, United Kingdom.
authors.forename: Bradley
authors.initials: B
authors.lastname: Ladewig
authors.affiliation: Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia. Electronic address: huanting.wang@monash.edu.
authors.forename: Huanting
authors.initials: H
authors.lastname: Wang
keywords: Composite beads; Metal organic framework; Oil sorption; Water treatment; ZIF-8