KINETIC STUDY ON THE REMOVAL OF BTX COMPOUNDS IN BATCH REACTOR USING ACTIVATED CARBON FROM COCONUT SHELL AS THE ADSORBENT
DOI:
https://doi.org/10.18316/rca.v14i2.4366Keywords:
BTX, Adsorption Kinetics, Pseudo-First-Order, Pseudo-Second-Order, Intraparticle Diffusion.Abstract
The adsorption kinetics of BTX compounds (benzene, toluene, o-xylene) in aqueous solution was investigated in a batch reactor at 23 ±1°C using a commercial thermally-activated coconut shell carbon. The solution pH did not affect the adsorption and the thermal activation of the adsorbent produced a higher amount of negative charges on the surface, increasing the adsorption efficiency, due to the weakly positive charges of the BTX molecules. In order to determine the mechanism and the limiting step of the adsorption process, the kinetics data were fitted using different models: the pseudo-first-order, pseudo-second-order and intraparticle diffusion models. The pseudo-second-order model was more appropriate for describing the adsorption rate based on the high correlation coefficient (R2) and because the qe calculated was reasonably similar to qe experimental values. Through a detailed study involving kinetic experiments it was also possible to identify the controlling stage of the process from the fitting of the intraparticle diffusion model. The high values for the correlation coefficients indicated that the process is strongly controlled by the second-stage of the diffusion for all compounds studied at different concentrations.
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