One-pot Synthesis of Multifunctional KGM/PDA/PVDF Composite Membrane for Efficient Treatment of Oil-water Emulsion and Dye

A new multifunctional KGM/PDA/PVDF composite membrane was successfully prepared via facile nonsolvent induced phase inversion method. Here, the KGM component consisted of numerous covalent bonds, which could improve the corrosion resistance of membrane materials. The dopamine, as a natural glue between PVDF substantial and KGM, is capable of integrating different materials together suitably. The as-prepared membrane possessed superior superhydrophilic/underwater superoleophobic property, great corrosion resistance and antifouling property. The separation efficiency was as high as 99.01%, and could stay relatively stable even in the acid, alkali or high salty environment. Additionally, the membrane had great regeneration performance and could keep stable after 15 cyclic separation, which was appropriate for efficient various oil-water separation process. Moreover, the composite membrane could also effectively separate dyes in different environments and the efficiencies were all more than 91%. All in all, the multifunctional composite membrane with facile preparation method might provide a promising strategy and significant theoretical basis for the efficient separation of oil-water emulsions and dyes. Multifunctional KGM/PDA/PVDF composite membrane was gained via blending the biomass material KGM, PDA and PVDF powder. The separation efficiency was as high as 99.01%, and could stay relative stable even in the acid, alkali or high salty environment. Moreover, the composite membrane could also effectively separate dyes in different environments and the efficiency was all more than 91%.

Automated summary

The new multifunctional KGM/PDA/PVDF composite membrane was successfully prepared through a simple method, exhibiting excellent separation efficiency and stability, maintaining relatively stable performance in acidic, alkaline, or high salt environments. Additionally, the composite membrane can effectively separate dyes in different environments with separation efficiencies all above 91%.