title: Oxidant-Induced High-Efficient Mussel-Inspired Modification on PVDF Membrane with Superhydrophilicity and Underwater Superoleophobicity Characteristics for Oil/Water Separation.
abstract: In this work, a facile one-step approach was developed to modify hydrophobic polyvinylidene fluoride (PVDF) microfiltration membrane with superhydrophilicity and underwater superoleophobicity properties via a high-efficient deposition of polydopamine (PDA) coating oxidized by sodium periodate in a slightly acidic environment (pH = 5.0). In contrast to the traditional PDA coating on hydrophobic membranes autoxidized by O2in a weak basic buffer solution, the superhydrophilicity and ultrahigh pure water permeability (about 11 934 L m-2h-1under 0.038 MPa) of the PDA-decorated PVDF membrane are derived from optimized chemical oxidation without postmodifications or additional reactants. The as-prepared membrane exhibits excellent oil/water separation ability evaluated by water fluxes and oil rejection ratios of various oil/water mixtures and oil-in-water emulsions. Moreover, the outstanding antifouling performance and reusability of the PDA-modified PVDF membrane provide a long-term durability for many potential applications. The modified membrane also exhibits excellent chemical stability in harsh pH environments and mechanical stability for practical applications.
authors.affiliation: Donadeo Innovation Centre for Engineering, Department of Chemical and Materials Engineering, University of Alberta , Edmonton T6G 1H9, Canada.
authors.forename: Chongdan
authors.initials: C
authors.lastname: Luo
authors.affiliation: Donadeo Innovation Centre for Engineering, Department of Chemical and Materials Engineering, University of Alberta , Edmonton T6G 1H9, Canada.
authors.forename: Qingxia
authors.identifier: http://orcid.org/0000-0002-4587-2086
authors.initials: Q
authors.lastname: Liu
keywords: microfiltration; oil/water separation; polydopamine; superhydrophilicity; underwater superoleophobicity