Thermodynamics of the nickel, cobalt and zinc removal from ethanolic solution by p-aminobenzoic acid intercalated on layered calcium phosphate

Crystalline lamellar calcium phosphate retained p-aminobenzoic acid inside its cavity without leaching. The adsorption isotherms from ethanol gave the maximum adsorption capacities of 6.44, 3.34 and 1.62 mmol g super(-1) for nickel, cobalt and zinc, respectively. The energetic effects caused by meta...

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Published inThermochimica acta Vol. 589; pp. 107 - 113
Main Authors de Souza, Fernando M, Dias, Ana Paula B, Babeto, Beatriz, Pelisson, Scarlet, Lazarin, Angelica M, Sernaglia, Rosana L, Andreotti, EIS, Airoldi, Claudio
Format Journal Article
LanguageDutch
Published 10.08.2014
Subjects
Adsorption
Calcium phosphate
Cations
Cobalt
Ethyl alcohol
Nickel
Thermodynamics
Zinc
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Summary:Crystalline lamellar calcium phosphate retained p-aminobenzoic acid inside its cavity without leaching. The adsorption isotherms from ethanol gave the maximum adsorption capacities of 6.44, 3.34 and 1.62 mmol g super(-1) for nickel, cobalt and zinc, respectively. The energetic effects caused by metallic cation interactions were determined through calorimetric titration at the solid/liquid interface and gave a net thermal effect that enabled enthalpy and equilibrium constant calculations. Complete thermodynamic data composed of exothermic enthalpy, negative free Gibbs energy and positive entropy conformed to a set of favorable cation/basic center interactions, to indicate that these materials could be useful tools to eliminate undesirable cations from ethanolic systems.
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ISSN:0040-6031
DOI:10.1016/j.tca.2014.05.017