Calorimetric study of the immersion heats of lead(II) and chromium(VI) from aqueous solutions of Colombian coffee husk

Author： Ladino-Ospina Y.   Giraldo-Gutierréz L.   Moreno-Piraján J. C.  

Publisher： Springer Publishing Company

ISSN： 1388-6150

Source： Journal of Thermal Analysis and Calorimetry, Vol.81, Iss.2, 2005-07, pp. : 435-440

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Abstract

This work shows the result of the study of the Pb(II) and Cr(VI) ions adsorption by means of a Calvet type calorimeter of heat conduction that can operate at 150şC. The calorimeter was electrically calibrated to establish its sensitivity and reproducibility, obtaining K=12.95±0.05 W V-1 and chemically it was examined with tris-(hydroxymethyl)-aminomethane (THAM)-HCl system, obtaining ∆H= -30.91±0.03 kJ mol-1. The activated carbon sample obtained from coffee husk and the calorimetric results obtained were related to other techniques used to perform this type of studies.

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