静电纺丝复合反渗透膜的改性制备与脱盐性能

利用静电纺丝技术在无纺布上制备PET纳米纤维膜, 并用交联壳聚糖对其进行改性得到壳聚糖改性纳米纤维复合膜. 以间苯二胺(MPD)和均苯三甲酰氯(TMC)为单体, 采用界面聚合法在壳聚糖改性纳米纤维复合膜的表面制备聚酰胺分离层, 得到新型静电纺丝纳米纤维基复合反渗透膜. 新型复合反渗透膜具有典型的聚酰胺复合反渗透膜的表面脊-谷结构. 从膜的表面形貌、 亲水性、 分离性能等3个方面对水相MPD溶液中阴离子表面活性剂十二烷基苯磺酸钠(SDBS)的含量对膜结构和性能的影响进行了系统研究. 结果表明, SDBS的含量对膜形态结构的均匀性和亲水性有一定影响, 且随着SDBS含量的增加, 膜的脱盐率先增大后减小, 而通量小幅度上升后, 先减小后增大, 呈现规律性变化.

Preparation and Desalination Performance of Composite Reverse Osmosis Membrane Based on Electrospinning Technology†

Electrospun polyethylene terephthalate ( PET) nanofibrous membranes were prepared on the non-woven cloth, then crosslinked chitosan was coated on the composite membrane to modify it. Finally inter-facial polymerization was conducted using m-phenylene diamine(MPD) and 1,3,5-benzenetricarbonyl trichlo-ride(TMC) benzene as monomers on chitosan modified nanofibrous to prepare polyamide separation layer. A new type of nanofibrous composite reverse osmosis membrane was obtained. This composite reverse osmosis membrane has typical ridge and valley structure of the typical commercial polyamide composite reverse osmosis membrane. Sodium dodecyl benzene sulfonate(SDBS) content on the properties and structure of the membrane was systematically studied from three aspects, means the film surface morphology, hydrophilicity and separa-tion properties. The results showed that the content of SDBS had a certain effect on the uniformity and hydro-philicity of the membrane morphology. In addition, with the increase of SDBS content, membrane desalination first increases then decreases, and the flux had a small amplitude increase,then it decrease after the increase.