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https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2015, Volume 66, Issue 7,





Mihaela Neagu,Daniela Popovici
Kinetics and Mechanism of p-toluidine Adsorption onto Granular Activated Carbon

Abstract:

In this work the kinetics and mechanisms of p-toluidine adsorption from aqueous solution onto mesoporous granular activated carbon were studied for 100, 1000 and 2000 mg L-1 initial concentrations, at constant 22oC temperature. Three models, i.e., pseudo-first order, pseudo-second order, and Avrami fractionary order were tested to fit the kinetic data. In order to evaluate the kinetic parameters, the nonlinear regression has selected as robust algorithm. The adsorption processes were found to follow Avrami fractionary order model with values of n [1 meaning that the adsorption is more approximated to the pseudo-first order kinetic. The adsorption mechanism was determined from intra-particle diffusion model. Weber-Morris plots indicate that the intra-particle diffusion is not the rate-limiting step for the whole adsorption process. Keywords: adsorption, activated carbon, p-toluidine, kinetics, mechanism


Issue: 2015, Volume 66, Issue 7
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