Effects of inorganic anions on the morphology of sodium oxalate crystallized from highly alkaline solutions

Fu, Weng, Vaughan, James and Gillespie, Alistair (2014) Effects of inorganic anions on the morphology of sodium oxalate crystallized from highly alkaline solutions. Crystal Growth and Design, 14 4: 1972-1980. doi:10.1021/cg5000952


Author Fu, Weng
Vaughan, James
Gillespie, Alistair
Title Effects of inorganic anions on the morphology of sodium oxalate crystallized from highly alkaline solutions
Journal name Crystal Growth and Design   Check publisher's open access policy
ISSN 1528-7483
1528-7505
Publication date 2014-04-02
Year available 2014
Sub-type Article (original research)
DOI 10.1021/cg5000952
Open Access Status Not yet assessed
Volume 14
Issue 4
Start page 1972
End page 1980
Total pages 9
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Subject 1600 Chemistry
2500 Materials Science
3104 Condensed Matter Physics
Abstract The crystallization of sodium oxalate (NaCO ) crystals was studied in the presence of different inorganic anions of the Bayer liquor in the alumina industry, including OH, CI , Al(OH), CO, and SO. The morphology of the obtained NaC O crystals depends on the type and concentration of anion species under similar oxalate supersaturation. The presence of divalent anions (CO, SO) has a greater influence on the morphological variability, including cyclic twins, spherulites, and double-leaf structures, through the branching growth process. The specific surface areas of NaCO crystals grown in the presence of divalent anions (CO, SO ) are more than 2 times higher than those in the presence of monovalent anions (OH, CI, Al(OH) ). X-ray photoelectron spectra results indicate that the inorganic anions (CI, Al(OH) , CO , SO) are adsorbed onto the surface of NaCO crystals, thereby inducing internal stress (defects) of crystals and modifying the crystal morphology.
Formatted abstract
The crystallization of sodium oxalate (Na2C2O4) crystals was studied in the presence of different inorganic anions of the Bayer liquor in the alumina industry, including OH, CI, Al(OH)4, CO32–, and SO42–. The morphology of the obtained Na2C2O4 crystals depends on the type and concentration of anion species under similar oxalate supersaturation. The presence of divalent anions (CO32–, SO42–) has a greater influence on the morphological variability, including cyclic twins, spherulites, and double-leaf structures, through the branching growth process. The specific surface areas of Na2C2O4 crystals grown in the presence of divalent anions (CO32–, SO42–) are more than 2 times higher than those in the presence of monovalent anions (OH, CI, Al(OH)4). X-ray photoelectron spectra results indicate that the inorganic anions (CI, Al(OH)4, CO32–, SO42–) are adsorbed onto the surface of Na2C2O4 crystals, thereby inducing internal stress (defects) of crystals and modifying the crystal morphology.
Keyword Chemistry, Multidisciplinary
Crystallography
Materials Science, Multidisciplinary
Chemistry
Crystallography
Materials Science
CHEMISTRY, MULTIDISCIPLINARY
CRYSTALLOGRAPHY
MATERIALS SCIENCE, MULTIDISCIPLINARY
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2015 Collection
 
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Created: Fri, 16 May 2014, 06:49:48 EST by Dr James Vaughan on behalf of School of Chemical Engineering