聚酰胺管式复合纳滤膜的分离性能研究
Study on the separation performance of polyamide tubular composite nanofiltration membranes
以聚偏氟乙烯(PVDF)管式超滤膜为基膜,聚乙烯亚胺(PEI)为水相单体,均苯三甲酰氯(TMC)为有机相单体,采用界面聚合(IP)的方法制备出针对氯化镁盐溶液表现为不同截留性能的管式复合纳滤膜。通过改变2种单体浓度,研究不同浓度单体对管式复合膜截留率和通量的影响,还分析了不同性能管式复合纳滤膜的切割分子量、接触角、其他无机盐的性能测试以及染料和盐溶液的分离性能。结果表明,不同浓度的单体制备出的纳滤膜性能具有多样化,可应用于不同的水处理场景。根据孔径分析,对氯化镁盐溶液截留性能为10%~97%的复合膜表现为致密纳滤膜和疏松纳滤膜,致密纳滤膜截留其他无机盐溶液也可以达到很好的效果,疏松纳滤膜可应用于染料与盐溶液的分离。
Using polyvinylidene fluoride (PVDF) tubular ultrafiltration membranes as the substrate,polyethyleneimine (PEI) as the aqueous-phase monomer,and trimesoyl chloride (TMC) as the organic-phase monomer,tubular composite nanofiltration membranes with varying rejection performances for magnesium chloride solutions were prepared via interfacial polymerization.By adjusting the concentrations of the two monomers,the effects of different monomer concentrations on the rejection rate and permeation flux of the tubular composite membranes were investigated.Additionally,the molecular weight cut-off,contact angle,performance tests with other inorganic salts,and the separation performance for dye and salt solutions of the composite NF membranes with different properties were analyzed.The results indicate that NF membranes prepared with different monomer concentrations exhibit diverse performance characteristics,making them suitable for various water treatment scenarios.Based on pore size analysis,composite membranes with MgCl2 rejection rates ranging from 10% to 97% are classified as either dense NF membranes or loose NF membranes.Dense NF membranes demonstrate excellent rejection performance for other inorganic salt solutions,while loose NF membranes can be effectively applied to the separation of dyes from salt solutions.
tubular membrane / nanofiltration membrane / polyamide / interfacial polymerization / dye desalination
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天津市科技计划项目(16PTGCCX00070)
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