Preparation of Zein/PA micro-nano fibrous membranes and their oil-water separation performance
Oil-water separation is important in waste-water treatment.Taking the advantage of the special wettability of Zein,an oil-water separation nanofibrous membrane with excellent separation efficiency and flux was prepared.To enhance the mechanical properties of Zein,Zein was electrospun with ES-11 alkyd soluble nylon(PA),which has excellent mechanical properties.The prepared Zein/PA fibrous membrane can realize on-demand oil-water separation,and substantially enhance the mechanical properties.The results show that the tensile stress and strain of the fibrous membrane reach 3.31 MPa and 64.79％when the proportion of PA reaches 35％.The separation efficiencies of different oil-water mixtures are above 98.5％,up to 99.6％,and the separation fluxes are up to 14 107 L/(m2·h).After 10 separation cycles,the separation efficiency and flux of the fibrous membrane keep as high as 98.7％and 13 287 L/(m2·h).The efficiency and flux of oil-water separation under acid,alkali and salt environments do not decrease significantly,indicating that the fibrous membrane has good resistance to acid,alkali and salt.
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