聚乳酸/rGO/HTPDMS纳米纤维膜制备及其性能研究

Preparation and Properties of PLA/rGO/HTPDMS Nanofiber Membranes

为了减小废弃油水对环境的危害,将聚乳酸-还原氧化石墨烯(PLA/rGO)与羟基封端聚二甲基硅氧烷(HTPDMS)以不同比例共混,通过静电纺丝技术制备了一系列PLA/rGO/HTPDMS复合纤维膜,结合扫描电子显微镜、红外光谱仪和接触角仪等对纤维膜的微观形貌、表面成分和疏水性进行表征。结果表明:PLA/rGO与HTPDMS共混后,所制得的纤维膜均以纳米尺度纤维构成,且膜中存在HTPDMS成分。HTPDMS的加入使PLA/rGO膜疏水性得到大幅提升。油-水混合物的分离具有较高油通量,通量均高于18400 L/(m^(2)·h),分离效率大于98.2%。经过10次循环分离后纤维膜分离效率仍可达到97%以上,具有良好循环稳定性。PLA/rGO/HTPDMS纤维膜在含油废水处理方面具有广阔的应用前景。

In order to reduce the environmental hazard of waste oil water,the composite nanofibrous membranes were fabricated by electrospinning technique.The membranes were prepared by blending poly(lactic acid)/reduced graphene oxide(PLA/rGO)and hydroxyl-capped polydimethylsiloxane(HTPDMS)in varying ratios.The nanofibrous membranes were subjected to characterization by a scanning electron microscopy,an infrared spectroscopy,and a contact angle instrument to assess their micro-morphology,surface composition,and hydrophobicity.The results show that the addition of HTPDMS into PLA/rGO results in the formation of membranes consisting of nano-scaled fibres with HTPDMS.The hydrophobicity of PLA/rGO membrane is greatly improved by the addition of HTPDMS.The separation of oil-water mixtures has high oil fluxes,the fluxes are higher than 18400 L/(m^(2)·h),and the separation efficiency is greater than 98.2%.After 10 cycles of separation,the separation efficiency of fiber membrane can still reach more than 97%,with good cycle stability.PLA/rGO/HTPDMS fiber membrane has a broad application prospect in oily wastewater treatment.