Formation of Cr(III) Hydroxides from Chrome Alum Solutions: 1. Precipitation of Active Chromium Hydroxide

The formation of active chromium hydroxide, Cr(OH)3·3H2O, was studied through potentiometric titrations and turbidimetric measurements. UV-Vis and IR spectroscopies were also employed to characterize the synthesized solid. The rapid addition of NaOH solution to aqueous chrome alum (KCr(SO4)2·12H2O)...

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Bibliographic Details
Published in:Journal of colloid and interface science 1996-06, Vol.180 (2), p.428-435
Main Authors: Avena, Marcelo J., Giacomelli, Carla E., De Pauli, Carlos P.
Format: Article
Language:English
Subjects:
Chemistry
chromium hydrolysis
chromium hydroxide
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
precipitation
suspensions
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Summary:The formation of active chromium hydroxide, Cr(OH)3·3H2O, was studied through potentiometric titrations and turbidimetric measurements. UV-Vis and IR spectroscopies were also employed to characterize the synthesized solid. The rapid addition of NaOH solution to aqueous chrome alum (KCr(SO4)2·12H2O) solutions caused the immediate precipitation of the active material. Only monomeric Cr(III) species seemed to be participating in the precipitation process; neither chromium polymers nor complexes with anions (SO2−4, Cl−, NO−3, ClO−4) influenced the fast formation of Cr(OH)3·3H2O. Titration studies allowed the determination of several hydrolysis and precipitation constants for Cr(III). Nevertheless, they cannot be used for the estimate of Cr(OH)03formation constant.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.1996.0322