高校化学工程学报2016，Vol.30Issue(6)：1249-1256,8.DOI:10.3969/j.issn.1003-9015.2016.06.003
荷正电聚氯乙烯/聚乙烯亚胺共混交联超滤膜制备及其染料/盐分离性能
Preparation of Positively-Charged Blend PVC/PEI Ultrafiltration Membranes with Crosslink Structure for Dye/Salt Separation
摘要
Abstract
A novel positively-charged polyvinyl chloride (PVC)/ poly(ethylene imine) (PEI) ultrafiltration (UF) membrane with crosslinking structure was proposed to explore membrane material and technology for dye/salt separation. A modified non-solvent induced phase separation route was created for the preparation of these PVC/PEI UF membranes, which consisted three simple steps including (1) dissolving PVC and PEI in DMAC at lower temperature to prepare a homogeneous casting solution;(2) spreading the casting solution into liquid film via a heating process to form crosslinking structure of PVC/PEI;and (3) immersing the liquid film in water to generate solid PVC/PEI membranes. The prepared PVC/PEI membranes were characterized in terms of composition, surface potential, mechanical property, pore size, structure and dye/salt separation. The results reveal that the crosslinking degree is higher than 60%, and the isoelectric points are over pH 9. For the typical PVC/PEI UF membrane with pore size of 30 nm, the permeation flux of NaCl, CaCl2 and Na2SO4 aqueous solutions are higher than 110 L×m-2×h-1 at 0.15 MPa. The rejection of all these salts is lower than 5%, while the rejection of positive Victoria blue B and negative acid chrome blue K are 96%and 55%, respectively. It is the positive-positive repulsion effect between PVC/PEI membrane and Victoria blue B that generates the corresponding high rejection. The prepared PVC/PEI membranes show great potential in dye/salt mixture separation from aqueous solutions.关键词
聚氯乙烯/聚乙烯亚胺/交联/正电超滤膜/染料/盐分离/非溶剂诱导相分离Key words
polyvinyl chloride/poly(ethylene imine)/crosslink/positively charged ultrafiltration membranes/dye-salt separation/none solvent induced phase separation分类
化学化工引用本文复制引用
赵斌,欧阳密,朱宝库,张诚..荷正电聚氯乙烯/聚乙烯亚胺共混交联超滤膜制备及其染料/盐分离性能[J].高校化学工程学报,2016,30(6):1249-1256,8.基金项目
国家自然科学基金(20974094，51573165)；浙江省自然科学基金(LY15e030066)。 （20974094，51573165）
