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- Language
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- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received March 12, 2024
Accepted June 25, 2024
Available online January 25, 2025
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Enhanced CO 2 Sequestration Strategy Using CO 2 Capturing Material Synthesized from Spent Railway Tie Concrete
https://doi.org/10.1007/s11814-024-00214-1
Abstract
Lots of railway tie concrete waste are produced which needs appropriate treatment for disposal. This study introduces a novel
strategy for converting railway tie concrete waste into a highly effi cient CO 2 capturing material (RTC). To enhance the CO 2
capturing capabilities, a CaCl 2 solution was employed as a modifying agent (Ca-RTC). The introduction of a 0.001 M CaCl 2
solution increased the Ca content in Ca-RTC by only 0.08% compared to unmodifi ed RTC, yet it signifi cantly enhanced
porosity and surface area. This modifi cation led to an 11.57% of excellent CO 2 capturing ability, which is 2.5 times greater
than that of the original RTC. Even though the Ca content is similar in RTC and Ca-RTC, the signifi cant increase in BET
surface area led to a notable improvement in CO 2 capturing ability. However, increasing the CaCl 2 concentration beyond
0.005 M resulted in a reduction of CO 2 capturing ability, attributed to the inhibitory eff ect of Cl − ions. The kinetics of the CO 2
capturing reaction and the impact of CO 2 pressure on Ca-RTC were systematically investigated. Finally, the CO 2 capturing
mechanism of Ca-RTC was elucidated.
