Tunable synthesis of polyethylene polyamine modified lignin and application for efficient adsorption of Fe2+ in super acid system

Lignin-Based Platform as a Potential Low-Cost Sorbent for the Direct Air Capture of CO2

“…Herein, we report the modification of industrial softwood kraft lignin with diethylenetriamine (DETA), triethylenetetramine (TETA), and tetraethylenepentamine (TEPA) via the Mannich reaction in a facile one-pot synthesis. Lignin is a biopolymer composed of sinapyl alcohol, p -coumaryl alcohol, and coniferyl alcohol monomeric units (Figure ) thus enabling amine addition via a Mannich-type condensation reaction on p -coumaryl and coniferyl alcohol units (Figure ), as priory reported. , …”

“…Lignin is a biopolymer composed of sinapyl alcohol, p-coumaryl alcohol, and coniferyl alcohol monomeric units (Figure 2) thus enabling amine addition via a Mannich-type condensation reaction on p-coumaryl and coniferyl alcohol units (Figure 3), as priory reported. 30,31 To the best of our knowledge, the covalent modification of lignin with various alkylamines for the investigation of their performance for the CO 2 capture has not been reported. The novel aminated lignin sorbents obtained herein were evaluated for determining the optimal alkylamine and amine density toward maximizing the CO 2 uptake based on the carbon dioxide adsorption−desorption isotherms.…”