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Control of Uniform and Interconnected Macroporous Structure in PolyHIPE for Enhanced CO2 Adsorption/Desorption Kinetics
- Wang, Quanyong, Liu, Yao, Chen, Jian, Du, Zhongjie, Mi, Jianguo
- Environmental Science & Technology 2016 v.50 no.14 pp. 7879-7888
- adsorbents, adsorption, carbon dioxide, desorption, emulsions, flue gas, polymers, porous media, surface area, thermodynamics
- The highly uniform and interconnected macroporous polymer materials were prepared within the high internal phase hydrosol-in-oil emulsions (HIPEs). Impregnated with polyethylenimine (PEI), the polyHIPEs were then employed as solid adsorbents for CO₂ capture. Thermodynamic and kinetic capture-and-release tests were performed with pure CO₂, 10% CO₂/N₂, and moist CO₂, respectively. It has shown that the polyHIPE with suitable surface area and PEI impregnation exhibits high CO₂ adsorption capacity, remarkable CO₂/N₂ selectivity, excellent adsorption/desorption kinetics, enhanced efficiency in the presence of water, and admirable stability in capture and release cycles. The results demonstrate the superior comprehensive performance of the present PEI-impregnated polyHIPE for CO₂ capture from the postcombustion flue gas.