Abstract
Poly(amidoamine) (PAMAM) dendrimers were incorporated into cross-linked poly(vinyl alcohol) (PVA) matrix to improve carbon dioxide (CO2) separation performance at elevated pressures. In our previous studies, PAMAM/PVA hybrid membranes showed high CO2 separation properties from CO2/H2 mixed gases. In this study, three types of organic Ti metal compounds were selected as PVA cross-linkers that were used to prepare PAMAM/cross-linked PVA hybrid membranes. Characterization of the PAMAM/cross-linked PVA hybrid membranes was conducted using nanoindentation and thermogravimetric analyses. The effects of the cross-linker and CO2 partial pressure in the feed gas on CO2 separation performance were discussed. H2O and CO2 sorption of the PAMAM/PVA hybrid membranes were investigated to explain the obtained CO2 separation efficiencies.
Highlights
Carbon dioxide (CO2) capture and storage (CCS) is generally considered as an option for climate change mitigation [1]
Sirkar et al [5,6,7] reported that a poly(amidoamine) (PAMAM) dendrimer-immobilized liquid membrane (ILM) can achieve a high CO2/N2 selectivity under atmospheric pressure
The PAMAM/Poly(vinyl alcohol) (PVA) hybrid membranes prepared in the presence of a cross-linking agent exhibited higher elastic modulus and hardness than those prepared in the absence of a cross-linking agent
Summary
Carbon dioxide (CO2) capture and storage (CCS) is generally considered as an option for climate change mitigation [1]. Sirkar et al [5,6,7] reported that a poly(amidoamine) (PAMAM) dendrimer-immobilized liquid membrane (ILM) can achieve a high CO2/N2 selectivity under atmospheric pressure. To improve CO2 separation performance at pressure difference conditions, hybrid membranes have been developed by incorporating or immobilizing a PAMAM dendrimer into a polymer matrix in our research group. Effective incorporation of a PAMAM dendrimer into a cross-linked poly(ethylene glycol) (PEG) was realized by photopolymerization of PEG dimethacrylate [11,12,13], and the resulting membrane showed a high CO2/H2 separation performance. A novel hybrid membrane of PAMAM dendrimer/cross-linked PVA was developed [18,19,20]. H2O and CO2 sorption of the PAMAM/PVA hybrid membranes were examined to determine the effect of the cross-linker on the CO2 separation properties
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