Isotherm and thermodynamic modelling of malachite green on CO2-activated carbon fibers

We designed porous carbon fibers with the aid of CO2 during activation for effective malachite green (MG) adsorption. The physiochemical mechanisms have been characterized both experimentally and numerically to decipher the underlying relevance of CO2-activation on the MG adsorption capacity. The obtained samples are dominated by micropores, resulting in a high specific surface up to 1012 m(2) g(-1) via 60 min of CO2-activation. The adsorption isotherm was fitted to Langmuir with the maximum adsorption capacity of 555.56 mg L-1. The regeneration was secured over 80% during 3 trials. Thermodynamics revealed endothermic in nature and the spontaneous adsorption process.

Automated summary

Porous carbon fibers were designed with CO2 activation for enhanced malachite green adsorption, characterized both experimentally and numerically to reveal the physiochemical mechanisms, resulting in high specific surface area and effective adsorption performance. Adsorption isotherm fits Langmuir model with high maximum adsorption capacity, and regeneration rate over 80% was achieved in multiple trials. Thermodynamics analysis showed endothermic and spontaneous nature of the adsorption process.