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Adsorption Isotherms of Citric Acid Acting as a Growth‐Suppressor onto the (100) and (111) Faces of Sodium Chloride Crystals in Supersaturated Aqueous Solution
Author(s) -
Sasaki S.,
Kubota N.,
Doki N.
Publication year - 2006
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.200500353
Subject(s) - aqueous solution , supersaturation , citric acid , supercooling , adsorption , impurity , chemistry , crystal (programming language) , sodium , inorganic chemistry , chloride , crystal growth , langmuir adsorption model , crystallography , thermodynamics , organic chemistry , physics , computer science , programming language
The growth‐starting supercooling Δ T G , a degree of supercooling at which a crystal starts to grow when the solution is continuously cooled, was measured in supersaturated aqueous solutions in the presence of citric acid as an impurity. It was measured both for the (100) and (111) faces of sodium chloride crystals. From the measured data of Δ T G , the Langmuir constants of the (100) and (111) faces were determined at pH = 4.5 to be 6.16 ± 0.88 L/mol and 12.5 ± 2.0 L/mol, respectively. This Δ T G method is a convenient method for the determination of adsorption isotherms of an impurity onto specific crystallographic faces of a crystal.