Mesoporous silica–amine beads from blast furnace slag for CO2 capture applications

Steel slag, abundantly available at a low cost and containing over 30 wt% silica, is an attractive precursor for producing high-surface-area mesoporous silica. By employing a two-stage dissolution-precipitation method using 1 M HCl and 1 M NaOH, we extracted pure SiO2, CaO, MgO, etc. from blast furn...

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Veröffentlicht in:Nanoscale 2024-08, Vol.16 (34), p.16251-16259
Hauptverfasser: Singh, Baljeet, Kemell, Marianna, Yliniemi, Juho, Repo, Timo
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Sprache:eng
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Zusammenfassung:Steel slag, abundantly available at a low cost and containing over 30 wt% silica, is an attractive precursor for producing high-surface-area mesoporous silica. By employing a two-stage dissolution-precipitation method using 1 M HCl and 1 M NaOH, we extracted pure SiO2, CaO, MgO, etc. from blast furnace slag (BFS). The water-soluble sodium silicate obtained was then used to synthesize mesoporous silica. The resulting silica had an average surface area of 100 m2 g−1 and a pore size distribution ranging from 4 to 20 nm. The mesoporous silica powder was further formed into beads and post-functionalized with polyethyleneimine (PEI) for cyclic CO2 capture from a mixture containing 15% CO2 in N2 at 75 °C. The silica-PEI bead was tested over 105 adsorption–desorption cycles, demonstrating an average CO2 capture capacity of 1 mmol g−1. This work presents a sustainable approach from steel slag to cost-effective mesoporous silica materials and making CO2 capture more feasible.
ISSN:2040-3364
2040-3372
2040-3372
DOI:10.1039/d4nr02495h