Improvement on surface hydrophily of hollow fiber-supported PDMS gas separation membrane by PVP modification

doi:10.3785/j.issn.1008-973X.2019.02.004

Journal of ZheJiang University (Engineering Science)

2019, Vol. 53

Issue (2): 228-233 DOI: 10.3785/j.issn.1008-973X.2019.02.004

Energy Engineering

Improvement on surface hydrophily of hollow fiber-supported PDMS gas separation membrane by PVP modification

Lei-qing HU(

),Jun CHENG*(

),Ya-li WANG,Jian-zhong LIU,Jun-hu ZHOU,Ke-fa CEN

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

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Abstract

Polyvinyl pyrrolidone (PVP) with high polarity was adopted to modify the surface of PDMS layer supported on polyacrylonitrile (PAN) hollow fiber, in order to improve the polarity and hydrophily of PDMS layer surface and ensure the minimum negative effect on gas permeability. The employment of PVP was to enhance the interfacial cohesion of polydimethylsiloxane (PDMS) gutter layer and polar selective layer in gas separation composite membrane. X-ray photoelectron spectroscopy (XPS) was utilized to prove that PVP could be grafted to PDMS layer and modify its surface by dip-coating, and the grafting quality and modification of PVP increased and enhanced respectively with the increase of coating time. Results showed that the crosslinker 1,3,5-Benzenetricarbonyl trichloride (TMC) could improve the function of PVP grafting modification, and the surfacewater contact angel decreased to 21.1°, which meant that the surface polarity and hydrophily of PDMS layer were obviously improved and the PDMS layer and polar selective layer were tightly combined. In addition, with the increase of molar ratio of TMC/PDMS, CO₂/H₂, CO₂/CH₄ and CO₂/N₂ selectivity decreased gradually by PVP modification, peaking at 3.9, 3.8 and 11.8, respectively.

Key words： membrane gas separation surface modification permeability polarity

Received: 25 January 2018 Published: 21 February 2019

CLC:

X 511

Corresponding Authors: Jun CHENG E-mail: leiqinghu@zju.edu.cn;juncheng@zju.edu.cn

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	Lei-qing HU
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	Ke-fa CEN

Cite this article:

Lei-qing HU,Jun CHENG,Ya-li WANG,Jian-zhong LIU,Jun-hu ZHOU,Ke-fa CEN. Improvement on surface hydrophily of hollow fiber-supported PDMS gas separation membrane by PVP modification. Journal of ZheJiang University (Engineering Science), 2019, 53(2): 228-233.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2019.02.004 OR http://www.zjujournals.com/eng/Y2019/V53/I2/228

PVP改性PDMS/PAN中空纤维复合膜提升表面亲水性

为了改善气体分离复合膜中聚二甲基硅氧烷（PDMS）过渡层与极性分离层的界面结合，利用高极性的聚乙烯吡咯烷酮（PVP）修饰聚丙烯腈（PAN）中空纤维支撑的PDMS气体分离膜表面，以提高PDMS表面极性和亲水性并减少对气体渗透速率的不利影响. 利用X射线光电子能谱（XPS）证实利用溶液浸渍法可以将PVP接枝在PDMS表面对其修饰，并且随着浸渍时间的增加，PVP接枝量逐步增加，修饰效果逐渐增强. 实验结果表明，交联剂1,3,5-苯三甲酰氯（TMC）增强了PDMS表面的PVP接枝改性，PVP修饰使PDMS表面的水接触角降低到21.1°，显著提高了PDMS表面亲水性和极性，从而有利于PDMS层和极性分离层的紧密结合. PVP修饰使得CO₂对其他气体（H₂、CH₄、N₂）的选择性随TMC/PDMS摩尔比的增加而逐渐降低，气体选择性CO₂/H₂、CO₂/CH₄、CO₂/N₂的最大峰值分别为3.9、3.8、11.8.

关键词： 膜, 气体分离, 表面修饰, 渗透率, 极性

Fig.1 Material chemical structures and SEM image of PAN hollow fiber

Tab.1 Variation of mass fraction of special elements on surface of PDMS/PAN hollow fiber composite membrane before and after PVP grafting modification

Fig.2 XPS spectrum of PDMS/PAN hollow fiber composite membrane before and after PVP grafting modification

Fig.3 Water contact angles of PDMS/PAN hollow fiber composite membranes before and after PVP grafting modification under different molar ratios of TMC/PDMS

Fig.4 CO₂ permeation rate of PDMS/PAN hollow fiber composite membrane before and after PVP grafting modification under different molar ratios of TMC/PDMS

Fig.5 Selectivities of CO₂ to other gases of PDMS/PAN hollow fiber composite membrane before and after PVP grafting modification under different molar ratios of TMC/PDMS


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