Mesoporous silica-amine beads from blast furnace slag for CO 2 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 SiO , CaO, MgO, . from blast furnace...
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Veröffentlicht in: | Nanoscale 2024-08, Vol.16 (34), p.16251-16259 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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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 SiO
, CaO, MgO,
. 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 m
g
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 CO
capture from a mixture containing 15% CO
in N
at 75 °C. The silica-PEI bead was tested over 105 adsorption-desorption cycles, demonstrating an average CO
capture capacity of 1 mmol g
. This work presents a sustainable approach from steel slag to cost-effective mesoporous silica materials and making CO
capture more feasible. |
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ISSN: | 2040-3364 2040-3372 |
DOI: | 10.1039/D4NR02495H |