PPy electro-responsive membrane for oil/water separation and its anti-fouling performance
Membrane separation is an important technique for oil-water separation.However,due to the hydrophobic nature of polymeric membrane materials,membranes are prone to oil fouling and clogging during oil-water separation,resulting in reduced separation efficiency and a shortened lifetime.Herein,a novel polypyrrole(PPy)conductive membrane was prepared by a one-step method of blending modification and in situ chemical oxidation.The PPy-doped membrane surface exhibited more micro-nano bulged structure and higher roughness than unmodified one.The application of reduction potential was found to shrink the pore size and increase the hydrophilicity of the PPy conductive membrane,which can improve the oil-water separation and anti-fouling performance.When a constant voltage of-1 V was applied,the pore size of the PPy conductive membrane shrank by 10.59％and the water contact angle decreased from 96° to 45°.At the same time,the oil-water separation efficiency reached up to 99.38％.After 5 cycles of emulsified liquid fouling experiments,the PPy conductive membrane still retained 77.11％of its original flux,which is a fivefold increase compared with the flux of the unmodified membrane.The prepared PPy conductive membrane exhibits an excellent oil-water separation performance and resistance to oil fouling,showing great application prospects in oily wastewater treatment.
万方数据
维普
