Journal
PROCESSES
Volume 7, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/pr7090592
Keywords
waste polyurethane foam; physical activation; high selectivity; CO2 capture; ultra-micropore
Categories
Funding
- National Natural Science Foundation of China [21802101]
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi
- Shanxi Province Science Foundation for Youths [201801D221129]
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Low-cost activated carbons were prepared from waste polyurethane foam by physical activation with CO2 for the first time and chemical activation with Ca(OH)(2), NaOH, or KOH. The activation conditions were optimized to produce microporous carbons with high CO2 adsorption capacity and CO2/N-2 selectivity. The sample prepared by physical activation showed CO2/N-2 selectivity of up to 24, much higher than that of chemical activation. This is mainly due to the narrower microporosity and the rich N content produced during the physical activation process. However, physical activation samples showed inferior textural properties compared to chemical activation samples and led to a lower CO2 uptake of 3.37 mmol.g(-1) at 273 K. Porous carbons obtained by chemical activation showed a high CO2 uptake of 5.85 mmol.g(-1) at 273 K, comparable to the optimum activated carbon materials prepared from other wastes. This is mainly attributed to large volumes of ultra-micropores (<1 nm) up to 0.212 cm(3)g(-1) and a high surface area of 1360 m(2)g(-1). Furthermore, in consideration of the presence of fewer contaminants, lower weight losses of physical activation samples, and the excellent recyclability of both physical- and chemical-activated samples, the waste polyurethane foam-based carbon materials exhibited potential application prospects in CO2 capture.
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