Mamaghani, Hawbolt, et al (2024) Impact evaluation of coexisting gas CO on CO₂ adsorption on biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More derived from softwood shavings. Separation and Purification Technology. https://doi.org/10.1016/j.seppur.2024.126529

Unlocking the potential of biochar for carbon dioxide (CO2) adsorption has been a focal point in various studies. However, this research takes a step further by investigating the interplay between biochar and carbon monoxide (CO) in gas mixtures, shedding light on the complexities of biochar’s adsorption capabilities.

The study begins with molecular modeling predictions, suggesting that CO2 is preferred over CO due to stronger adsorption energy. Experimental batch and dynamic adsorption tests corroborate these findings, revealing that the non-homogeneous surface of biochar aligns with a dual-site Langmuir isotherm. The Avrami kinetic model indicates both chemical and physical interactions in the adsorption processes.

Results show that pure CO2 adsorption capacity is over three times greater than pure CO. Dynamic binary adsorption experiments reveal the dominance of CO2 over CO, with up to 50% CO removal by CO2. Surprisingly, at 100°C, while CO2 adsorption is negatively impacted, CO adsorption remains unaffected, highlighting temperature sensitivity.

In conclusion, this study unveils the nuanced dynamics of biochar’s adsorption, emphasizing its potential in selectively capturing CO2 from gas mixtures. As we delve into sustainable solutions for environmental challenges, understanding biochar’s behavior becomes instrumental.