Development of Mixed Matrix Membranes Utilizing Modified Porous Halloysite Nanotubes to Enhance the Separation Efficiency of CO2/CH4
WU Wei1,2, LIANG Wenju1,2, WANG Lizeng1,2, ZHU Weifang1,2,*, GUO Ruili1,2,*
1 School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, Xinjiang, China 2 State Key Laboratory Incubation Base for Green Process of Chemical Engineering, Shihezi 832003, Xinjiang, China
Abstract: Halloysite nanotubes (HNTs), consisting of [AlO6] and [SiO4] silicoaluminate sheets, possess a natural hollow nano-channel and have garnered significant attention in the gas separation field due to their exceptional biocompatibility. To enhance the gas separation performance of HNTs-based mixed matrix membranes (MMMs), the compositional disparities in the inner and outer structures of HNTs as well as their surface charge properties were taken into account. Initially, sodium hydroxide (NaOH) was employed for selective etching of the HNTs, followed by treatment with hydrofluoric acid (HF) to enlarge the pores of the HNT nanotubes post-alkali etching. Subsequently, a polymer coating was in-situ polymerized on the surface of acid-and alkali-etched HNTs to produce porous polymer nanotubes, designated as PEI@EHNTs. These PEI@EHNTs were then utilized as fillers and incorporated into polyether polyamide copolymer (Pebax 1657) to fabricate MMMs for CO2/CH4 separation. Performance data demonstrated that when the filler content of PEI@EHNTs was 4wt%, optimal gas separation performance was achieved by the MMMs. Under dry mixed gas testing conditions, the CO2 permeability and CO2/CH4 selectivity of Pebax/PEI@EHNTs membrane were (381.38±7.7) Barrer and 17.99±0.84 respectively, representing an increase of 211.94% and 34.25% compared to pure membrane performance. Under wet mixed gas testing conditions, the CO2 permeability and CO2/CH4 selectivity of the Pebax/PEI@EHNTs membrane exhibited a significant increase of 83.30% and 61.74% over the pure membrane, reaching (733.21±30.81) Barrer and 53.74±3.58, respectively.
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2025, Vol. 39 
