Preparation And Properties Of Phosphorylated Polyvinyl Alcohol Hydrogel Mesh

How to effectively treat oily wastewater is a research hotspot that scholars all over the world pay close attention to.Among them,the use of separation membrane materials for separation is one of the research focuses.In this paper,a kind of oil-water separation membrane was prepared by coating hydrogel on stainless steel mesh as the base material,and its performance was tested.Furthermore,two optimization methods of the membrane were discussed,including improving the crosslinking method of the hydrogel,increasing the underwater oleophobic property of the membrane,and finally improving the overall performance of the membrane.The specific results are as follows:(1)Phosphorylated polyvinyl alcohol was cross-linked and coated on a stainless steel mesh by glutaraldehyde to prepare a hydrogel-coated stainless steel mesh.Tests show that the water contact angle of the separation mesh reached 0° in the air,has superhydrophilicity,and the underwater oil contact angle(kerosene)reached 155.2° and has underwater superoleophobic performance.At the same time,the separation efficiency of the mixture of different oil with water was above 99% and has good recycling property,abrasion resistance,and environmental corrosion resistance.In addition,the phosphorylated polyvinyl alcohol retaliated steel mesh also has the effect of separating emulsion and has good demulsification effect.(2)Phosphorylated polyvinyl alcohol coated steel mesh was prepared by ion crosslinking instead of glutaraldehyde crosslinking to improve the influence of glutaraldehyde on the natural environment and production environment during use.Tests show that the mesh membrane still has superhydrophilicity and superoleophobic property under water,the water contact angle was 0°,the oil contact angle(kerosene)reached 153.4°,and the Separation efficiency of the mesh membrane for various Oil-Water mixtures was still higher than 99%,which showed good separation efficiency.At the same time,the ion-crosslinked mesh membrane retains the excellent cycleability,abrasion resistance,environmental corrosion resistance and emulsion separation capability of glutaraldehyde crosslinked steel mesh,indicating the success of the improved method.(3)The method of mixing attapulgite into hydrogel was adopted to construct a membrane surface with micro-nano structure and improve the surface roughness of the separation membrane,so as to further enhance the underwater superoleophobic property of the mesh.Tests show that while the excellent hydrophilicity(water contact angle was 0° and the high Separation efficiency of Oil-Water mixture(over 99%)were ensured,the corrosion resistance and emulsion separation ability were not greatly affected,and the underwater oil contact angle(kerosene)reached 161.5°,the cycleability and abrasion resistance of the mesh were improved,and the overall performance of the mesh was enhanced.