MoS_(2)纳米复合中空纤维膜的制备及渗透汽化性能

Preparation and Pervaporation Performance of MoS_(2)Nanocomposite Hollow Fiber Membrane

二维纳米材料复合膜是目前膜分离领域的研究热点。通过在具有不规则大孔结构的陶瓷中空纤维基膜上引入TiO_(2)过渡层,有效地降低了基膜的孔径和粗糙度。在复合膜外表面构筑MoS_(2)/PVA(聚乙烯醇)分离层,用于异丙醇脱水,通过原子力显微镜(AFM)、扫描电子显微镜(SEM)、X射线光电子能谱仪(XPS)等表征了复合膜的微观形貌,考察了分离层厚度、操作温度及料液浓度对复合膜分离性能的影响。在50℃下分离质量分数为90%的异丙醇水溶液时,MoS_(2)/PVA-30复合膜表现出了较优的分离性能,其渗透通量为486 g/(m^(2)·h),分离系数为445。

Pervaporation(PV)process is a membrane-based separation technology that provides low-cost,environmentally friendly,and efficient characteristics in the separation of azeotropic mixtures.In this work,we provided a preparation method of a composite membrane based on molybdenum disulfide(MoS_(2))two-dimensional material used to dehydrate isopropanol aqueous solution.A ceramic hollow fiber(CHF)membrane was used as a substrate to prepare the MoS_(2)composite membrane.In order to reduce the macropores on the surface of the CHF membrane,a TiO_(2) intermediate layer was introduced on the outer surface of the CHF substrate.Polyvinyl alcohol(PVA)was used as a binder in the preparation of the MoS_(2)/PVA separation layer.A MoS_(2)/PVA separation layer was constructed on the surface of the TiO_(2)-CHF membrane by vacuum filtration,and then crosslinked with glutaraldehyde solution to reduce the swelling degree of the MoS_(2)/PVA separation layer in aqueous solution.The morphology and physico-chemical properties of the obtained membranes were studied by field emission scanning electron microscopy(FESEM),X-ray diffraction(XRD),atomic force microscopy(AFM),energy-dispersive X-ray spectroscopy(EDS),X-ray photoelectron spectroscopy(XPS),and water contact angle(WCA)measurements.The MoS_(2)/PVA composite membrane showed 486 g/(m^(2)·h)of permeation flux and 445 of separation factor in a 90%IPA aqueous solution at 50℃.