From biopolymer dissolution to CO2 capture under atmospheric pressure - A molecular view on biopolymer@Ionic liquid materials

• DOI: 10.1016/j.jclepro.2022.132977
• Publication Date: 2022-07-04T20:42:24Z
• Authors: Mónica Lopes; André Cecílio; Marcileia Zanatta; Marta C. Corvo
• Keywords: Biopolymer

Finding a cheap and easily recycling material that can capture CO2 under atmospheric pressure (1 atm) is of paramount importance. In this context, combining ionic liquids (ILs) with abundant natural materials, such as chitin-based biopolymers, appears an interesting alternative. work, four acetate-based ILs were selected to explore the solubility chitin, chitosan, carboxymethyl-chitosan. Using carboxymethyl-chitosan biopolymer monomer units models, different Nuclear Magnetic Resonance (NMR) techniques, namely, 1H, 13C, nuclear Overhauser effect spectroscopy, spin-lattice relaxation, performed evaluate dissolution. Shrimp shells used chitin source. Through simple acid/base treatment, it was possible remove minerals proteins, use prepare [email protected] materials for tests. Efficient sorption capacity observed upon bubbling maximum 2.32 mmolCO2/gsorbent. Under N2 bubbling, system demonstrated excellent using room temperature procedure outperformed aqueous amine solutions recycling. The absence heating vacuum procedures, combined or compressed air much more appealing industrial applications.