摘要
创新性地将核孔膜作为基膜,使用聚偏氟乙烯(PVDF)为膜材料,N,N-二甲基乙酰胺(DMAc)为溶剂,采用非溶剂致相分离法制备了PVDF/PET核孔膜复合疏水/亲水膜,并对复合膜的微观结构、机械性能、亲疏水性、孔隙结构进行深入表征,研究了添加剂含量和核孔膜孔径对膜微观形态和性能的影响.结果表明,提高LiCl添加剂含量使得铸膜液的黏度增大,膜指状孔结构变小且海绵状结构变紧密,PVDF/PET核孔复合膜的平均剥离力从4.48 N下降为1.19 N,孔径从0.132 7μm减少到0.080 4μm,孔隙率从44.65%减少至37.60%;核孔膜孔径增大导致复合膜的机械强度下降.直接接触式膜蒸馏(DCMD)分离性能测试表明,PVDF/PET核孔复合膜通量比相同厚度单层PVDF疏水膜通量提升约30%;可稳定运行超过39 h.
Nuclear track membrane generally possesses controllable pores,low heat resistance,high mechanical strength,and high acid/alkali resistance.In contrast to the non-woven fabrics-based membrane,nuclear track membrane displays much lower mass transfer resistance・In this paper,the nuclear track membrane is innovatively used as the base membrane,polyvinylidene fluoride(PVDF)is used as the bulk membrane material using N,N-dimethylacetamide(DMAc)solvent.The PVDF composite membrane is prepared by the non-solvent induced phase separation method.The microstructure,mechanical properties,hydrophobic property,and porosity of the composite membrane are discussed in terms of additive LiCl concentration and different nuclear track membranes.The results show that the high concentration of the LiCl additive increases the viscosity of the casting solution,resulting in a finger-like pore structure becomes smaller and the compact sponge structure in the composite membrane.The maximum peel strength of the PVDF/PET nuclear track composite membrane decreases from 4.48 N to 1.19 N,and the pore size decreases from 0.1327μm.to 0.0804μm,the porosity decreased from 44.65%to 37.60%;the large pore size of the nuclear track membrane reduces the mechanical strength of the composite membrane.DCMD separation test exhibits that the flux of the PVDF composite membrane is about 30%higher than that of a single layer PVDF hydrophobic membrane at the same thickness;it stably runs 39 h in the stability test.
作者
唐娜
陈乃麟
项军
田桂英
TANG Na;CHEN Nailin;XIANG Jun;TIAN Guiying(College of Chemical Engineering and Materials,Tianjin University of Science&Technology,Tianjin Key Laboratory of Brine Chemical Industry and Ecological Utilization of Resources,Tianjin 300457,China)
出处
《膜科学与技术》
CAS
CSCD
北大核心
2021年第4期25-34,共10页
Membrane Science and Technology
基金
天津市自然科学基金(18JCZDJC37200)。
关键词
核孔膜
非溶剂致相分离法
疏水/亲水膜
直接接触式膜蒸馏
nuclear track membrane
non-solvent induced phase separation
hydrophobic/hydrophilic membrane
direct contact membrane distillation
