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Molecules 2017, 22(7), 1032; doi:10.3390/molecules22071032

Effect of Solution pH on the Adsorption of Paracetamol on Chemically Modified Activated Carbons

Departamento de Química, Universidad Nacional de Colombia, Cra 30 No. 45-03, Bogotá D.C. 110231, Colombia
Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università di Napoli Federico II, P. Le Tecchio 80, 80125 Napoli, Italy
Departamento de Química, Universidad de los Andes, Cra 1a No. 18A-10, Bogotá D.C. 110231, Colombia
Author to whom correspondence should be addressed.
Received: 13 April 2017 / Accepted: 13 June 2017 / Published: 22 June 2017
(This article belongs to the Section Green Chemistry)
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Paracetamol adsorption in acidic, neutral and basic media on three activated carbons with different chemistry surfaces was studied. A granular activated carbon (GAC) was prepared from coconut shell; starting from this sample, an oxidized activated carbon (GACo) was obtained by treating the GAC with a boiling solution of 6 M nitric acid, so to generate a greater number of oxygenated surface groups. In addition, a reduced activated carbon (GACr) was obtained by heating the GAC at 1173 K, to remove the oxygenated surface groups. Paracetamol adsorption was higher for GACr due to the lower presence of oxygenated surface functional groups. Moreover, adsorption was highest at neutral pH. The magnitude of the interactions between paracetamol molecules and activated carbons was studied by measuring the immersion enthalpies of activated carbons in solution of paracetamol at different concentrations and pH values and by calculating the interaction enthalpy. The highest value was obtained for GACr in a paracetamol solution of 1000 mg L−1 at pH 7, confirming that paracetamol adsorption is favoured on basic activated carbons at pH values near to neutrality. Finally, the Gibbs energy changes confirmed the latter result, allowing explaining the different magnitudes of the interactions between paracetamol and activated carbons, as a function of solution pH. View Full-Text
Keywords: activated carbon; adsorption isotherms; Gibbs energy change; immersion enthalpy; paracetamol activated carbon; adsorption isotherms; Gibbs energy change; immersion enthalpy; paracetamol

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Bernal, V.; Erto, A.; Giraldo, L.; Moreno-Piraján, J.C. Effect of Solution pH on the Adsorption of Paracetamol on Chemically Modified Activated Carbons. Molecules 2017, 22, 1032.

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