Fabrication of Alkaline Earth Oxide-Containing Glass Adsorbents for Capturing Carbon Dioxide under Mild Conditions

Hyung Ju Kim, Sung Jun Kim, Hee Chul Yang, Hee Chul Eun, Keunyoung Lee, Jung Hyun Lee

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


With growing global concern on radiological hazards, there has been strong interest in the adsorbents for the treatment of radioactive carbon dioxide (CO2) containing C-14, which should be removed under mild operating conditions. In this study, we fabricated a new class of alkaline earth oxide-containing glass adsorbents with high CO2adsorption capacity and good adsorption rate under mild aqueous conditions, which is not feasible with alkaline earth oxide-containing natural minerals. The glass adsorbents were fabricated by incorporating alkaline earth oxides (SrO or CaO) into an amorphous glass framework using network modifiers (Na2O or K2O). The comprehensive characterization of the structure and adsorption and dissolution properties of the fabricated glass adsorbents revealed that CO2was adsorbed via the dissolution of alkaline earth metal ions and their subsequent carbonation through heterogeneous surface nucleation. Variation in the type of alkaline earth metals and network modifiers significantly affected the CO2adsorption performance and kinetics of the glass adsorbents by altering the dissolution behavior of the alkaline earth metal ions. The best fabricated glass adsorbent exhibited a high maximum CO2capacity of 5.56 mmol g-1and a fast carbonation rate of 5.31

Original languageEnglish
Article number102001
JournalJournal of CO2 Utilization
Publication statusPublished - 2022 Jul

Bibliographical note

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  • Alkaline earth oxide
  • COadsorption
  • Glass adsorbent
  • Mineral carbonation
  • Radioactive CO

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Process Chemistry and Technology


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