(694d) Bioinspired One-Step Co-Deposition PVDF Membrane Toward Multifunctional Applications: Oil/Water Emulsions Separation and Soluble Contaminants Adsorption

Bioinspired One-Step Co-Deposition PVDF Membrane toward Multifunctional Applications: Oil/Water Emulsions Separation and Soluble Contaminants Adsorption

Guangfa Zhang, Jingxian Jiang, Qinghua Zhang, Xiaoli Zhan, Fengqiu Chen

College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, P. R. China

ABSTRACT:

Bioinspired materials with special wettability towards water and oils have been proven very efficient in removal of insoluble organic pollutants in water. However, these materials cannot remove water-soluble organic contaminants (e.g., dyes and heavy metal ions), and often suffer some problems such as easy contamination by oils, low water tolerance and complicated preparation methods. Herein, we present a simple approach for the fabrication of fish scale and mussel-inspired underwater superoleophobic PVDF membranes via co-deposition of polydopamine (PDA) and chitosan mediated by tyrosinase. The facile modification procedure makes the membranes underwater superoleophobic with high contact angles of 160.1°and ultra-low adhesion force for oils. The as-prepared membranes not only can separate surfactant-stabilized oil/water emulsions with high fluxes, separation efficiency, and excellent antifouling properties, but also can effectively absorb heavy metal ions and dyes (copper ion and methyl blue) from water with very high removal efficiencies in a short time by simply passing through these membranes. Therefore, the simple and facile method has excellent potential in practical multifunctional wastewater treatment applications.

KEYWORDS: bioinspired PVDF membranes, underwater superoleophobic, oil/water emulsion separation, contaminant adsorption