Formation of Cr(III) hydroxides from chrome alum solutions. 1: Precipitation of active chromium hydroxide
Journal Article
·
· Journal of Colloid and Interface Science
- Univ. Nacional de Cordoba (Argentina)
The hydrolysis of Cr(III) and precipitation of colloidal chromium hydroxides are important processes occurring in soils and natural waters. The formation of active chromium hydroxide, Cr(OH){sub 3}{center_dot}3H{sub 2}O, 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(SO{sub 4}){sub 2}{center_dot}12H{sub 2}O) 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 (SO{sub 4}{sup 2{minus}}, Cl{sup {minus}}, NO{sub 3}{sup {minus}}, ClO{sub 4}{sup {minus}}) influenced the fast formation of Cr(OH){sub 3}{center_dot}3H{sub 2}O. 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){sub 3}{sup 0} formation constant.
- OSTI ID:
- 276793
- Journal Information:
- Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Journal Issue: 2 Vol. 180; ISSN 0021-9797; ISSN JCISA5
- Country of Publication:
- United States
- Language:
- English
Similar Records
Chromium(III) hydrolysis constants and solubility of chromium(III) hydroxide
Critical evaluation and selection of standard state thermodynamic properties for chromium metal and its aqueous ions, hydrolysis species, oxides, and hydroxides
Chromium(III) hydroxide solubility in the aqueous K{sup +}-H{sup +}-OH{sup_}-CO{sub 2}-HCO{sub 3}{sup -}CO{sub 3}{sup 2-}-H{sub 2}O system : a thermodynamic model.
Journal Article
·
Tue Feb 10 23:00:00 EST 1987
· Inorg. Chem.; (United States)
·
OSTI ID:6772597
Critical evaluation and selection of standard state thermodynamic properties for chromium metal and its aqueous ions, hydrolysis species, oxides, and hydroxides
Journal Article
·
Sat Oct 31 23:00:00 EST 1998
· Journal of Chemical and Engineering Data
·
OSTI ID:316259
Chromium(III) hydroxide solubility in the aqueous K{sup +}-H{sup +}-OH{sup_}-CO{sub 2}-HCO{sub 3}{sup -}CO{sub 3}{sup 2-}-H{sub 2}O system : a thermodynamic model.
Journal Article
·
Mon Oct 01 00:00:00 EDT 2007
· J. Solution Chem.
·
OSTI ID:929239