Abstract
The concentration of CO2 in indoor environments may exceed 800 ppm, making people feel lightheaded and uncomfortable. In response, this study demonstrates how to reduce indoor CO2 concentration using a solid membrane for gas separation and CO2 removal. In this investigation, the solid membrane is made by blending polyvinyl alcohol (PVA) and poly(allylamine) (PAA) solution and coating this material on the surface of a reverse osmosis membrane via a spin coater. The separation layer is formed after drying. This separation layer is modified by hydroxyl and amine functional groups, thereby improving selectivity and effectiveness of CO2 capture. FTIR and SEM were applied to characterize the surface of the reverse osmosis membrane. Testing of the membrane showed that with lower input gas pressure, CO2 gas has a larger gas permeability (GP) value than nitrogen at room temperature. When the pressure is 0.75 cm Hg, 1 wt% PVA + 7 wt% PAA has the greatest CO2/N2 gas selectivity ratio. Under these conditions, the selectivity is 10.7.
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Acknowledgements
The authors would like to acknowledge the supports from the Ministry of Science and Technology with contract number 103-2218-E-212-001 and National Science Council with contract number 101-2621-M-027-001.
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Shiue, A., Hsu, TH., Chang, SM. et al. Using polyvinyl alcohol (PVA):poly(allylamine) (PAA) coated on reverse osmosis membrane for separating carbon dioxide from indoor air. Int. J. Environ. Sci. Technol. 19, 4237–4250 (2022). https://doi.org/10.1007/s13762-021-03442-8
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DOI: https://doi.org/10.1007/s13762-021-03442-8