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Physicochemical Properties of Activated Carbon: Their Effect on the Adsorption of Pharmaceutical Compounds and Adsorbate–Adsorbent Interactions

1
Departamento de Química, Universidad Nacional de Colombia, 11001000 Bogotá, Colombia
2
Departamento de Química, Universidad de los Andes, 11001000 Bogotá, Colombia
*
Author to whom correspondence should be addressed.
Received: 3 October 2018 / Revised: 29 October 2018 / Accepted: 30 October 2018 / Published: 19 November 2018
(This article belongs to the Special Issue Carbons from Biomasic Waste and Their Applications)
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Abstract

The adsorption of salicylic acid, acetaminophen, and methylparaben (pharmaceutical products derived from phenol) on carbons activated with different surface chemistries was carried out. We evaluated the effect of the physicochemical properties of the adsorbent and adsorbates on the adsorption capacity. A study of the adsorbate–adsorbent interactions via immersion calorimetry in the analytes solutions at different concentrations was included, in addition to the equilibrium data analysis. The results show that the pharmaceutical compounds (2.28–0.71 mmol g−1) have lower adsorption capacities in the activated carbon with the highest content of oxygenated groups (acids), while the activated carbons with amphoteric characteristics increase the capacities of adsorption (2.60–1.38 mmol g−1). This behavior may be associated with the increased affinity between the adsorbent and solvent due to the presence of polar groups, which was corroborated by the high immersion enthalpy value in water (ΔHimmH2O = −66.6 J g−1). The equilibrium data, adjusted to the Freundlich adsorption model, indicated that the heterogeneous adsorption processes involve immersion enthalpy values between −9.42 and −24.3 J g−1. View Full-Text
Keywords: acetaminophen; activated carbon; adsorption; immersion enthalpy; methylparaben; phenol and salicylic acid; salicylic acid acetaminophen; activated carbon; adsorption; immersion enthalpy; methylparaben; phenol and salicylic acid; salicylic acid
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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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Bernal, V.; Giraldo, L.; Moreno-Piraján, J.C. Physicochemical Properties of Activated Carbon: Their Effect on the Adsorption of Pharmaceutical Compounds and Adsorbate–Adsorbent Interactions. C 2018, 4, 62.

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