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Enhanced CO Sequestration Strategy Using CO Capturing Material Synthesized from Spent Railway Tie Concrete

Korean Journal of Chemical Engineering, ISSN: 1975-7220, Vol: 42, Issue: 1, Page: 89-98
2025
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Article Description

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 efficient CO capturing material (RTC). To enhance the CO capturing capabilities, a CaCl solution was employed as a modifying agent (Ca-RTC). The introduction of a 0.001 M CaCl solution increased the Ca content in Ca-RTC by only 0.08% compared to unmodified RTC, yet it significantly enhanced porosity and surface area. This modification led to an 11.57% of excellent CO 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 significant increase in BET surface area led to a notable improvement in CO capturing ability. However, increasing the CaCl concentration beyond 0.005 M resulted in a reduction of CO capturing ability, attributed to the inhibitory effect of Cl ions. The kinetics of the CO capturing reaction and the impact of CO pressure on Ca-RTC were systematically investigated. Finally, the CO capturing mechanism of Ca-RTC was elucidated.

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