Synthesis and characterization of advanced bio-carbon materials from Kraft lignin with enhanced CO2 capture properties

• DOI: 10.1016/j.jece.2022.107471
• Publication Date: 2022-02-25T21:57:50Z
• Authors: Mengbin Li; Xin Liu; Chenggong Sun; Lee Stevens; Hao Liu
• Keywords: Carbon fibers; Specific surface area

Biomass-derived porous carbons have received enormous attention for CO2 capture in post-combustion scenarios owing to their wide availability, excellent physicochemical stability, and cost-effective preparation. Here, a series of advanced bio-carbon materials were successfully prepared by using the underutilized industrial by-product Kraft lignin as precursor via facile chemical activation process. Both textural surface properties bio-carbons found be highly tailorable tuning temperature, KOH/lignin ratio pre-oxidation treatment. It was that lignin-derived exceedingly ultra-microporous with ultra-microporosity accounting up 92% total micropores, while treatment uniquely characterised distinctive hierarchical micro-mesoporous structures. Applying adsorption demonstrates at partial pressure 15 kPa, rarely obtainable capacities 3.29 mmol/g 0 °C 2.01 25 achieved carbon 600 °C. Advanced characterizations confirm unique desirable combination chemistry, which favours intercalation potassium form extra-framework K+ ions, underpinned extraordinary performance high CO2/N2 selectivity (up 38) especially low pressures. The results indicate three-dimensional aromatic structures provide matrix liable development well-defined levels. Our work provided promising strategy valorization producing materials.