科研之友
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摘要
A new cycle platform has been built to provide an efficient method for biomass utilization and greenhouse gas control simultaneously via the interplay of interactions between ionic liquids (ILs), chitosan, and CO2. All samples, including chitosan/IL solutions, chitin/IL solutions, and pure ILs, were employed to perform experiments on CO2 capture/release. The results indicated that chitosan with a high degree of deacetylation can capture CO2 in a nearly 2:1 stoichiometry. In the meantime, different mechanisms of chitosan regeneration from acetate-based ILs and others were explored. For the acetate-based ILs, H-1 and C-13 NMR spectroscopy implied the formation of new species of [imida(+)-COO-] after the chemical CO2 capture, while only the changes of volume expansion and solvatochromic UVvis parameters can give rise to chitosan regeneration for the ILs with less basic anions. In addition, raw chitosan was used to demonstrate the cycle by selective capture of CO2 and precipitation from [Bmim]OAc using compressed CO2.
