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

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Revista de Chimie (Rev. Chim.), Year 2016, Volume 67, Issue 4,



Daniela Popovici, Cristina Dusescu, Mihaela Neagu

Removal of Phenol from Aqueous Solutions on Activated Carbon Obtained from Coffee Grounds

Abstract:

The phenol uptake onto ground coffee converted into activated carbon by chemical activation with ZnCl2 and H3PO4 was studied in the present work. The physical surface properties and the point of zero charge of AC-GC classified the adsorbent as micro-, mesoporous material, with a neutral surface. The equilibrium data of phenol adsorbed on AC-GC were fitted using Langmuir, Freundlich and Dubinin-Radushkevich adsorption isotherms. Our data are in agreement with Langmuir and Dubinin-Radushkevich models, revealing the maximum capacity of adsorption of 28.711 mg·g-1 and 29.516 mg·g-1 respectively. The adsorption free energy calculated by using Dubinin-Radushkevich model (E = 7.437 kJ·mol-1) is specific to physical adsorption. The adsorption kinetic was also investigated in this paper by using three models: pseudo-first order, pseudo-second order and intraparticle diffusion. The pseudo-second order model fit well to our experimental data and the intraparticle diffusion is just one of the steps that kinetically controls the process.

Keywords:
phenol; ground coffee; activated carbon; adsorption isotherms

Issue: 2016, Volume 67, Issue 4
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