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Crosslinked hydrogel-derived carbons activated by trace amounts of aqueous potassium carbonate for carbon dioxide adsorption.

Author information

Affiliations

  • 1. Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India; Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600036, India.
      Authors
    • Varghese SM 1
    (1 author)
  • 2. Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
      Authors
    • Chowdhury AR 2
    • Ranga Rao G 2
    (2 authors)
  • 3. Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600036, India.
      Authors
    • Arnepalli DN 3
    (1 author)

Bioresource Technology, 22 May 2024, 403:130851
https://doi.org/10.1016/j.biortech.2024.130851 PMID: 38782189 

Abstract 

A new method for green synthesis of activated carbon using chitosan-based hydrogel precursors is reported. Chitosan-based hydrogel materials are designed to absorb trace amounts of non-toxic and non-corrosive activating agent K2CO3 from dilute aqueous solution. The K2CO3 impregnated hydrogels are further freeze-dried and converted to activated carbons with tuneable pore structure by a single-step pyrolysis. Activated carbon with highest pore volume of 0.76 cm3/g and surface area of 2026 m2/g is obtained by using K2CO3 as low as 0.23 g per gram of chitosan hydrogel. It can adsorb maximum CO2 of 4.2 mmol/g at 25 °C and 1 bar. This study demonstrates that biopolymer hydrogels impregnated with trace amounts of K2CO3 are excellent precursor materials to design high surface area carbons for CO2 capture.

Full text links 

Read article at publisher's site: https://doi.org/10.1016/j.biortech.2024.130851

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Funding 

Funders who supported this work.

Department of Science and Technology, Ministry of Science and Technology, India (2)