聚醚砜/磺化聚砜/磺化聚醚砜共混疏松纳滤膜制备及染料/盐选择分离性能
作者:刘晓伟12,胡梦洋12,陶然12,崔振宇12,马小华12,李建新12
单位: 1天津工业大学分离膜与膜过程国家重点实验室,天津,300387;2天津工业大学材料科学与工程学院,天津,300387
关键词: 聚醚砜;磺化聚砜;磺化聚醚砜;疏松纳滤膜;染料/盐分离
分类号: TQ028
出版年,卷(期):页码: 2021,41(4):65-72

摘要:
 含盐染料废水的有效分离一直是工业废水处理领域亟需解决的难题,制备高性能的疏松纳滤膜是解决这一问题的有效途径。本文以聚醚砜(PES)、磺化聚砜(SPSf)和和磺化聚醚砜(SPES)为原料,N,N-二甲基乙酰胺(DMAc)为溶剂,己二酸(AA)为致孔剂配制铸膜液(固含量31 wt.%),水为凝固浴,采用非溶剂致相转化法(NIPS法)制备了PES/SPSf/SPES共混疏松纳滤膜。探究SPES添加量(0-20 wt.%)对膜结构以及染料/盐分离性能的影响。结果表明,PES/SPSf/SPES共混体系为完全相容体系,所制备共混膜横截面为完全的海绵体结构。当SPES添加量为10 wt.%时,所制备疏松纳滤膜(M10)切割分子量为5900 Da,膜孔径为1.38 nm,纯水渗透率为60.5 L m-2 h-1bar-1;共混膜对分散红74(DR74)和分散蓝79(DB79)的截留率均>99%;共混膜持续处理DR74/DB79/Na2SO4混合溶液48 h,对DR74和DB79的截留率均>99%,对Na2SO4的截留率<25%,表现出优异的染料截留性能和运行稳定性,实现了分散染料/盐的选择分离性能。
 The effective separation of saline dye wastewater has always been an urgent issue in the field of industrial wastewater treatment. PES, SPES (sulfonation degree-DS=25%) and SPSf (DS=25%) as raw materials (31 wt.% polymeric concentration), N,N-dimethylacetamide as solvent, adipic acid as a small molecular pore-forming and water as coagulanting bath (at) were employed to fabricate PES/SPES/SPSf loose nanofiltration (LNF) membrane. The effect of SPES concentration in casting solution on the morphology and performance was investigated. Results showed that the PES/SPSf/SPES blend system is a completely compatible system. The resulting PES/SPSf/SPES LNF membranes displayed a typical asymmetric structure with a dense skin layer and a sponge like sub layer. Specifiaclly, when SPES centration was 10 wt.% of polymers (PES/SPSf/SPES) (mass ratio of PES and SPES to SPSf =86/14) in the casting solution, the LNF membrane (M10) with the molecular weight cut off of 5900 Da and pore size of 1.38 nm was obtained. The pure water permeability of the resultant LNF membrane (M10) was 60.5 L m-2 h-1 bar-1(0.2 MPa). In addition, the rejection rate of LNF membrane (M10) was >99% for Disperse Red 74 and Blue 79. In a salt/dye mixed system, the rejection of M10 was over 99% for Disperse Red 74 and Blue 79 and lower than 25% for Na2SO4.It also exhibited an excellent selective separation performance and operation stability.

基金项目:
国家自然科学基金项目(21878230);国家重点研发计划项目(2020YFA0211000 & 2020YFA0211003)。

作者简介:
刘晓伟(1995-),男,河北张家口人,硕士生,从事聚合物分离膜及染料废水处理研究

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