Lignin-Based Porous Supraparticles for Carbon Capture

Bin Zhao, Maryam Borghei, Tao Zou, Ling Wang, Leena-Sisko Johansson, Johanna Majoinen, Mika H. Sipponen, Monika Österberg, Bruno D. Mattos*, Orlando J. Rojas*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)
69 Downloads (Pure)

Abstract

Multiscale carbon supraparticles (SPs) are synthesized by soft-templating lignin nano- and microbeads bound with cellulose nanofibrils (CNFs). The interparticle connectivity and nanoscale network in the SPs are studied after oxidative thermostabilization of the lignin/CNF constructs. The carbon SPs are formed by controlled sintering during carbonization and develop high mechanical strength (58 N·mm-3) and surface area (1152 m2·g-1). Given their features, the carbon SPs offer hierarchical access to adsorption sites that are well suited for CO2 capture (77 mg CO2·g-1), while presenting a relatively low pressure drop (∼33 kPa·m-1 calculated for a packed fixed-bed column). The introduced lignin-derived SPs address the limitations associated with mass transport (diffusion of adsorbates within channels) and kinetics of systems that are otherwise based on nanoparticles. Moreover, the carbon SPs do not require doping with heteroatoms (as tested for N) for effective CO2 uptake (at 1 bar CO2 and 40 °C) and are suitable for regeneration, following multiple adsorption/desorption cycles. Overall, we demonstrate porous SP carbon systems of low cost (precursor, fabrication, and processing) and superior activity (gas sorption and capture).

Original languageEnglish
Pages (from-to)6774–6786
Number of pages13
JournalACS Nano
Volume15
Issue number4
Early online date29 Mar 2021
DOIs
Publication statusPublished - 27 Apr 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • carbon supraparticles
  • cellulose nanofibrils
  • COcapture
  • evaporation-induced self-assembly
  • lignin particles

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