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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Bibliographic Details
Published in:Thermochimica acta 2014-08, Vol.589, p.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: Article
Language:dut
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.
ISSN:0040-6031
DOI:10.1016/j.tca.2014.05.017