A comparative study of two chelating ion-exchange resins for the removal of chromium(III) from aqueous solution

• Published in: Journal of hazardous materials Vol. 100; no. 1; pp. 231 - 243
• Main Authors: Gode, F., Pehlivan, E.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 27-06-2003; Elsevier
• Subjects: Applied sciences; Chelating Agents - chemistry; Chelating resin; Chemistry; Chromium - chemistry; Chromium - isolation & purification; Chromium(III); Exact sciences and technology; General and physical chemistry; General purification processes; Hydrogen-Ion Concentration; Ion exchange; Ion Exchange Resins - chemistry; Langmuir’s model; Models, Theoretical; Pollution; Solid-liquid interface; Sorption; Surface physical chemistry; Temperature; Wastewaters; Water Pollutants - isolation & purification; Water treatment and pollution; Sorption; Chromium(III); Ion exchange; Chelating resin; Langmuir’s model
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/S0304-3894(03)00110-9

Macroporous resins containing iminodiacetic acid (IDA) groups (Lewatit TP 207 and Chelex-100) were investigated as a function of concentration, temperature and pH for their sorption properties towards chromium(III). The chromium(III) ions sorbed onto the resin and in the equilibrium concentration were determined by inductively coupled plasma spectrophotometer. The maximum sorption for chromium ions was observed at pH 4.5. Solution pH had a strong effect on the equilibrium constant of Cr(III). The equilibrium constants were 320 and 7 at pH value 4.5 for Lewatit TP 207 and Chelex-100 resin, respectively. The Langmuir isotherm was used to describe observed sorption phenomena. Both the sorbents had high bonding constants with Lewatit TP 207 showing stronger binding. The equilibrium related to adsorption capacity and energy of adsorption was obtained by using plots of Langmuir adsorption isotherm. It was observed that the maximum adsorption capacity of 0.288
mmol of Cr(III)/g for Chelex-100 and 0.341
mmol of Cr(III)/g for Lewatit TP 207 was achieved at pH of 4.5. The rise in temperature caused a slight increase in the value of the equilibrium constant (
K
c) for the sorption of chromium(III) ion.