Comparative study of adsorption isotherms on activated carbons synthesized from rice husk towards carbon dioxide adsorption

Rice husk was chemically activated with saturated KOH solution and the activation temperature was varied from 400 to 700 degrees C to generate activated carbons with different textural characteristics. Activated carbons were investigated for their ability to adsorb CO2. We selected Langmuir, Freundlich, Sips and Radke-Prausnitz equations to fit the experimental CO2 adsorption data. In order to determine the effect of using different error standards when calculating isotherm model parameters, an error analysis was conducted. The Radke-Prausnitz model shows the best fit to CO2 adsorption and calculated adsorption capacity correlates closely with experimental data.

Automated summary

In this study, rice husk was chemically activated to produce activated carbons with varying textural characteristics, and their CO2 adsorption capacity was investigated. The Radke-Prausnitz model provided the best fit to the experimental data, accurately predicting the adsorption capacity.