SiO2改性聚丙烯纤维棉对油水乳状液的高效分离

Efficient separation of oil-water emulsion by SiO2-modified PP fabrics

摘要:

近年来，基于特殊润湿性理论制备表面具有微纳米粗糙结构的多孔材料成为油水分离领域研究的重点。为了满足不同环境下对不同形式油-水乳状液高效高通量分离的需求，该研究利用纳米SiO2颗粒对聚丙烯（PP）纤维棉有针对性地亲（疏）水改性，构建了系列不同润湿性和粗糙度的PP纤维棉，探究了不同孔隙度和表面能的PP纤维棉对W/O及O/W型乳状液的分离性能，结果表明，经过亲（疏）水改性后的PP纤维棉对水/正己烷和水/甲苯乳状液的分离效率都高于99.5%，通量高于700 L/(m2·h)，并针对不同形式油-水乳状液阐释其相应的分离机制，为后续油-水乳状液分离材料的科学设计和可控制备提供了理论依据。

Abstract:

Recently, the fabrication of porous materials with micro/nano rough structures based on the models of special wettability have attracted considerable attention in the field of oil-water separation. In order to satisfy demands of highly efficient and high flux gravity directed oil-water emulsions separation in different situations, in this study, a series of polypropylene (PP) fabrics with different super wettability and roughness are fabricated by modifying the PP fabrics with different amounts of SiO2 nanoparticles. The performances of W/O and O/W emulsions separated by PP fabrics with different pore size and surface energy were experimentally observed, and the results showed that, the modified fabrics exhibited excellent water/n-hexane and water/toluene emulsion separation performance with separation efficiencies > 99.5% and fluxs > 700 L/(m2·h). Furthermore, the corresponding separation mechanisms were investigated, which provide a theoretical basis for the scientific design and controllable fabrication of future oil-water emulsion separation materials.