Novel nanofiltration membranes with tunable permselectivity by polymer mediated phase separation in polyamide selective layer  

作　　者：Zhuan Yi Fa-dong Wu Yong Zhou Cong-jie Gao Zhuan Yi;Fa-dong Wu;Yong Zhou;Cong-jie Gao(Department of Ocean, Zhejiang University of Technology, Hangzhou 310014, China;Water Treatment Technology Development Center, Hangzhou 310012, China)

机构地区：[1]Department of Ocean, Zhejiang University of Technology, Hangzhou 310014, China [2]Water Treatment Technology Development Center, Hangzhou 310012, China

出　　处：《Chinese Journal of Chemical Engineering》2016年第11期1533-1540,共8页中国化学工程学报（英文版）

基　　金：Supported by the National Basic Research Program of China(2015CB655303);the Natural Science Foundation of Zhejiang Province(Q14B040003)

摘　　要：Microstructure in selective layer has played a decisive role in permselectivity of nanofiltration(NF) membranes,and nanomaterials were well-known additives that had been applied to mediate the microstructure and permeability of polyamide NF membranes. However, nanoadditives generally displayed a poor dispersion in membranes or in fabrication process. To solve this problem, we showed an interesting concept that novel NF membranes with hybrid selective layer consisting of flexible polyisobutylene(PIB) and rigid polyamide could be fabricated from well-defined interfacial polymerization. The hydrophobic polymer mediated phase separation and microdomains formation in polyamide layer were found. The immiscibility between the rigid polyamide and flexible PIB as well as the resultant interface effect was interpreted as the reason for the polymer enhanced permselectivity, which was similar with the well-known thin film nanocomposite(TFN) membranes that nanoparticles incorporated contributed significantly to membrane permeability and rejection performance.Our results have demonstrated that novel NF membranes with enhanced performance can be prepared from immiscible polymers, which is a new area that has not been extensively studied before.Microstructure in selective layer has played a decisive role in permselectivity of nanofiltration（NF） membranes,and nanomaterials were well-known additives that had been applied to mediate the microstructure and permeability of polyamide NF membranes. However, nanoadditives generally displayed a poor dispersion in membranes or in fabrication process. To solve this problem, we showed an interesting concept that novel NF membranes with hybrid selective layer consisting of flexible polyisobutylene（PIB） and rigid polyamide could be fabricated from well-defined interfacial polymerization. The hydrophobic polymer mediated phase separation and microdomains formation in polyamide layer were found. The immiscibility between the rigid polyamide and flexible PIB as well as the resultant interface effect was interpreted as the reason for the polymer enhanced permselectivity, which was similar with the well-known thin film nanocomposite（TFN） membranes that nanoparticles incorporated contributed significantly to membrane permeability and rejection performance.Our results have demonstrated that novel NF membranes with enhanced performance can be prepared from immiscible polymers, which is a new area that has not been extensively studied before.

关 键 词：Nanofiltration membranes Interfacial polymerization Polymer additive Hydrophobicity Fabrication 

分 类 号：TQ051.893[化学工程]