Hydrogen peroxide-treated glycerol sourced porous carbon with elemental sulfur-based sulfur-phosphorus co-doping for CO2 capture

Gerardo D.J. Guerrero Peña, Anish Mathai Varghese, Suresh Kuppireddy, Phil Hart, Rukayat Bojesomo, Nahla Alamoodi, Georgios Karanikolos, Abhijeet Raj, Mirella Elkadi

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1 Scopus citations

Abstract

In this work, glycerol and elemental sulfur-based porous carbon adsorbents with sulfur‑phosphorus co-doping and subsequent H2O2 treatment were developed for CO2 capture. The best adsorbent for capturing CO2 among the developed adsorbents was P‑carbon-2000mgS-H2O2, which had surface area of 652 m2/g, a total pore volume of 0.446 cm3/g, an average pore size of 2.74 nm, narrow micropore distribution, X-ray photoelectron spectroscopy (XPS)-based sulfur content of 5.7 at.% and phosphorus content of 3.7 at.%, Raman-based average PAHs size of 24.9 Å and a defect density of 4.47 × 1011 cm−2, and X-ray diffraction (XRD)-based nano-crystallite height of 11.15 Å and length of 23.35 Å. The CO2 adsorption capacity of P‑carbon-2000mgS-H2O2 was 1.95 mmol/g at 25 °C and 1 bar (3.02 mmol/g at 0 °C), and it also demonstrated an impressive CO2 selectivity over N2 at 25 °C, with 15.24 at 0.5 bar and 12.03 at 1 bar. In addition to cyclic performance, the isosteric heat of CO2 adsorption, which was found to be between 22 and 23 kJ/mol, suggested that a physical mechanism predominated the CO2 interaction with active sites. These findings suggest that employing elemental sulfur to produce glycerol-derived porous carbon with sulfur-phosphorus co-doping and subsequent H2O2 treatment is an effective method to produce CO2 capture adsorbents, facilitating the usage of glycerol and elemental sulfur - based products for large-scale applications.

Original languageBritish English
Article number178967
JournalScience of the Total Environment
Volume969
DOIs
StatePublished - 15 Mar 2025

Keywords

  • Co-doping
  • CO adsorption
  • Elemental sulfur
  • Glycerol
  • HO treatment
  • Phosphorus
  • Porous carbon
  • Waste upcycling

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