GO-TSC/聚酰亚胺混合基质膜的制备及气体分离性能研究

doi:10.19964/j.issn.1006-4990.2020-0658

Abstract

Abstract:

Graphene oxide（GO） was modified using thiosemicarbazide（TSC） for the fabrication of flat sheet GO-TSC cmpo-site.Subsequently,this composite was incorporated into the Matrimid^®5218（PI） matrix to fabricate mixed matrix membranes（MMMs） for CO₂ separation.Through TGA,SEM and gas separation performance tests,influence of GO-TSC on thermal sta-bility,structure and gas separation performance of the mixed matrix membrane was investigated.SEM showed that GO-TSC could be uniformly dispersed in the polymer matrix and tightly combined with the matrix;TGA result showed that decomposi-tion temperature of mixed matrix membranes was above 250 ℃.MMMs showed significantly enhanced CO₂ permeability com-pared with pure PI membrane.The amino group contained in GO-TSC had a good affinity with CO₂,and the increased amidogen sites could effectively transport CO₂.The GO-TSC lamellar structure increased the gas transmission path,which was not conducive to the passage of large dynamic diameter gases（CH₄,N₂）,thereby improving the separation performance.The MMMs doped with GO-TSC-0.75% showed optimal gas separation performance.Compared with pure PI membrane,the CO₂ permeability,CO₂/CH₄ selectivity and CO₂/N₂ selectivity of the MMMs were increased by 42.16%,95.79% and 83.72%,respectively.

Key words: graphene oxide, polyimide, mixed matrix membrane, gas separation

CLC Number:

TQ028.8

Guo Xin,Yi Hualei,Yuan Weiliang,Hao Yun,Duan Cuijia,Chen Zan. Study on preparation of GO-TSC/polyimide mixed matrix membrane and its gas separation performance[J]. Inorganic Chemicals Industry, 2021, 53(10): 74-80.

Figures/Tables 12

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Table 1

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Table 2

References 30

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混合基质膜	度数/（°）	间距/nm
PI	15.90	0.562
PI/GO-TSC-0.5%	16.17	0.553
PI/GO-TSC-0.75%	16.29	0.549
PI/GO-TSC-1%	16.35	0.547
PI/GO-TSC-1.25%	16.47	0.543
PI/GO-TSC-1.5%	16.61	0.538

填料	P （CO₂）/Barrer	α （CO₂/CH₄）	α （CO₂/N₂）	测试条件
SO₃H-MCM-41^[25]	11.20	40.50	37.40	0.4 MPa,35 ℃
POSS-Zn^2+[26]	4.00	57.60	30.76	1.0 MPa,35 ℃
PEGSS^[27]	10.42	49.62	47.36	0.1 MPa,40 ℃
C60^[28]	3.79	34.80	23.70	1.0 MPa,35 ℃
CU-BPY-HFS^[29]	10.40	27.40	33.40	0.39 MPa,35 ℃
MCM-48^[30]	9.35	33.39	31.16	0.25 MPa,35 ℃
GO-TSC	10.11	60.55	51.86	0.2 MPa,35 ℃

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Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of GO-TSC/polyimide mixed matrix membrane and its gas separation performance

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