Thin-film-composite hollow fiber membranes containing amino acid salts as mobile carriers for CO2 separation

• DOI: 10.1016/j.memsci.2019.02.023
• Publication Date: 2019-02-13T16:45:45Z
• Authors: Zhongde Dai; Jing Deng; Luca Ansaloni; Saravanan Janakiram; Liyuan Deng
• Keywords: Permeance; Facilitated Diffusion; Matrix (chemical analysis)

In this work, defect-free thin-film-composite (TFC) hollow fiber membranes containing various amino acid salts as CO2 facilitated transport carriers were fabricated via dip-coating. Four different salts, i.e., potassium prolinate (ProK), argininate (ArgK), glycinate (GlyK) and cysteinate (CysK), selected embedded within polyvinyl alcohol (PVA) matrix. TGA, FTIR, SEM humid mixed gas permeation test used for the evaluation. Experiments show that adding into PVA matrix significantly increases permeance with little influence on CO2/N2 selectivity. ProK was found most effective four investigated mobile carriers; The addition of 40% nearly doubled (from 399 to 791 GPU). PVA/amino salt also exhibited good long-term stability, in which both selectivity remained unchanged a 20-h after two-week shutdown period.