Formation of Cr(III) hydroxides from chrome alum solutions .1. Precipitation of active chromium hydroxide

被引:27
作者
Avena, MJ [1 ]
Giacomelli, CE [1 ]
dePauli, CP [1 ]
机构
[1] NATL UNIV CORDOBA,FAC CIENCIAS QUIM,DEPT FISICOQUIM,INFIQC,RA-5016 CORDOBA,ARGENTINA
关键词
chromium hydroxide; precipitation; chromium hydrolysis; suspensions;
D O I
10.1006/jcis.1996.0322
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The formation of active chromium hydroxide, Cr(OH)(3) . 3H(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(SO4)(2) . 12H(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 (SO42-, Cl-, NO3-, ClO4-) influenced the fast formation of Cr(OH)(3) . 3H(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)(3)(0) formation constant. (C) 1996 Academic Press, Inc.
引用
收藏
页码:428 / 435
页数:8
相关论文
共 27 条
[1]  
[Anonymous], HELV CHIM ACTA
[2]  
AVENA MJ, 1993, THESIS U NACIONAL CO
[3]  
BAES CF, 1976, HYDROLYSIS CATIONS, P220
[4]   COMPLEX CHEMISTRY OF HYDROUS CHROMIUM(III) OXIDE SOL FORMATION [J].
BELL, A ;
MATIJEVIC, E .
JOURNAL OF INORGANIC & NUCLEAR CHEMISTRY, 1975, 37 (04) :907-912
[5]   EXAFS STUDIES OF THE FORMATION OF CHROMIA PILLARED CLAY CATALYSTS [J].
BORNHOLDT, K ;
CORKER, JM ;
EVANS, J ;
RUMMEY, JM .
INORGANIC CHEMISTRY, 1991, 30 (01) :1-2
[6]   X-RAY ABSORPTION SPECTROSCOPIC STUDY OF THE SORPTION OF CR(III) AT THE OXIDE WATER INTERFACE .2. ADSORPTION, COPRECIPITATION, AND SURFACE PRECIPITATION ON HYDROUS FERRIC-OXIDE [J].
CHARLET, L ;
MANCEAU, A .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1992, 148 (02) :443-458
[7]   EXAFS STUDIES OF PILLARED CLAY CATALYSTS [J].
CORKER, JM ;
EVANS, J ;
RUMMEY, JM .
MATERIALS CHEMISTRY AND PHYSICS, 1991, 29 (1-4) :201-209
[8]  
DEMING SN, 1973, ANAL CHEM, V45, pA278
[9]   PROPERTIES OF HYDROXY-AL AND HYDROXY-CR INTERLAYERS IN MONTMORILLONITE [J].
DUBBIN, WE ;
GOH, TB ;
OSCARSON, DW ;
HAWTHORNE, FC .
CLAYS AND CLAY MINERALS, 1994, 42 (03) :331-336
[10]   FORMATION RATES OF MONOSUBSTITUTED CHROMIUM(3) COMPLEXES IN AQUEOUS SOLUTION [J].
ESPENSON, JH .
INORGANIC CHEMISTRY, 1969, 8 (07) :1554-&