title: High-performance multilayer composite membranes with mussel-inspired polydopamine as a versatile molecular bridge for CO2 separation.
abstract: It is desirable to develop high-performance composite membranes for efficient CO2 separation in CO2 capture process. Introduction of a highly permeable polydimethylsiloxane (PDMS) intermediate layer between a selective layer and a porous support has been considered as a simple but efficient way to enhance gas permeance while maintaining high gas selectivity, because the introduced intermediate layer could benefit the formation of an ultrathin defect-free selective layer owing to the circumvention of pore penetration phenomenon. However, the selection of selective layer materials is unfavorably restricted because of the low surface energy of PDMS. Various highly hydrophilic membrane materials such as amino group-rich polyvinylamine (PVAm), a representative facilitated transport membrane material for CO2 separation, could not be facilely coated over the surface of the hydrophobic PDMS intermediate layer uniformly. Inspired by the hydrophilic nature and strong adhesive ability of polydopamine (PDA), PDA was therefore selected as a versatile molecular bridge between hydrophobic PDMS and hydrophilic PVAm. The PDA coating endows a highly compatible interface between both components with a large surface energy difference via multiple-site cooperative interactions. The resulting multilayer composite membrane with a thin facilitated transport PVAm selective layer exhibits a notably enhanced CO2 permeance (1887 GPU) combined with a slightly improved CO2/N2 selectivity (83), as well as superior structural stability. Similarly, the multilayer composite membrane with a hydrophilic CO2-philic Pebax 1657 selective layer was also developed for enhanced CO2 separation performance.
authors.affiliation: Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 30072, PR China.|Tianjin Key Laboratory of Membrane Science and Desalination Technology, State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 30072, PR China.
authors.forename: Panyuan
authors.initials: P
authors.lastname: Li
authors.affiliation: Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 30072, PR China.|Tianjin Key Laboratory of Membrane Science and Desalination Technology, State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 30072, PR China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 30072, PR China.|Tianjin Key Laboratory of Membrane Science and Desalination Technology, State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 30072, PR China.
authors.forename: Wen
authors.initials: W
authors.lastname: Li
authors.affiliation: Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 30072, PR China.|Tianjin Key Laboratory of Membrane Science and Desalination Technology, State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 30072, PR China.
authors.forename: Yanni
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 30072, PR China.|Tianjin Key Laboratory of Membrane Science and Desalination Technology, State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 30072, PR China.
authors.forename: Jixiao
authors.initials: J
authors.lastname: Wang
authors.affiliation: Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 30072, PR China.|Tianjin Key Laboratory of Membrane Science and Desalination Technology, State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 30072, PR China.
authors.forename: Shichang
authors.initials: S
authors.lastname: Wang
mesh_terms: D000818:Animals; D049872:Bivalvia / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation / Q000379:methods*; D057927:Hydrophobic and Hydrophilic Interactions; D007211:Indoles / Q000737:chemistry*; D008567:Membranes, Artificial; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D013499:Surface Properties
chemical_list: D007211:Indoles; D008567:Membranes, Artificial; D011108:Polymers; C568283:polydopamine; D002245:Carbon Dioxide
keywords: composite membrane; gas separation; intermediate layer; polydopamine; polyvinylamine