Preparation and Separation Properties of Superhydrophilic Lignin Sulfonate/Hyperbranched Polyamide Hybrid Grafted Poly(vinylidene fluoride)Microfiltration Membranes
To quickly and efficiently remove the organic dye and oil pollutants in the wastewater,poly-(vinylidene fluoride)(PVDF)microporous membrane as the substrate was first treated with alkalization and surface grafting polymerization of glycidyl methacrylate,and then crosslinked with sodium amine lignosulfonate(LA)and hyperbranched polyamide(HP).Finally the superhydrophilic lignin sulfonate/hyperbranched polyamide hybrid hydrogel modified PVDF membrane(PVDF-HPAS)was prepared.The PVDF-HPAS membrane showed excellent separation performance for the anion dye solutions,the separation fluxes for CR was 3942 L·m-2·h-1,and the separation efficiency can reach 100％.PVDF-HPAS has excellent oil/water emulsion separation flux and efficiency.The flux and separation efficiency of n-hexane emulsion were 3152 L·m-2·h-1 and more than 98％,respectively.In addition,PVDF-HPAS membrane has good reusability and antifouling properties.The excellent performance of the modified film is attributed to the electrostatic effect of the three-dimensional network structure superhydrophilic gel layer on the dye retention and adsorption,the demulsification of a large number of amino and hydroxyl groups,and the water mass transfer effect of the three-dimensional structure and the porous structure of the PVDF membrane.
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