Displacement mechanism of binary competitive adsorption for aqueous divalent metal ions onto a novel IDA-chelating resin: Isotherm and kinetic modeling

Adsorptive properties for Cu (II), Pb (II) and Cd (II) onto an iminodiacetic acid (IDA) chelating resin were systematically investigated at the optimal pH-value in both single and binary solutions using batch experiments. The Langmuir isotherm model and the pseudo second-order rate equation could ex...

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Bibliographic Details
Published in:	Water research (Oxford) 2011-01, Vol.45 (3), p.1177-1188
Main Authors:	Li, Lanjuan, Liu, Fuqiang, Jing, Xiaosheng, Ling, Panpan, Li, Aimin
Format:	Article
Language:	eng
Subjects:	Adsorption Applied sciences Cadmium Cadmium - chemistry Cations, Divalent - chemistry Chelating Agents - chemistry Coefficients Competitive adsorption Copper Copper - chemistry Displacement mechanism equations Exact sciences and technology Imino Acids - chemistry Iminodiacetic acid chelating resin Isotherms Kinetics lead Lead (metal) Lead - chemistry Mathematical models Metal ion metal ions Models, Theoretical Other industrial wastes. Sewage sludge Pollution Selectivity sorption isotherms Surface chemistry Wastes Water treatment and pollution
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Summary:	Adsorptive properties for Cu (II), Pb (II) and Cd (II) onto an iminodiacetic acid (IDA) chelating resin were systematically investigated at the optimal pH-value in both single and binary solutions using batch experiments. The Langmuir isotherm model and the pseudo second-order rate equation could explain respectively the isotherm and kinetic experimental data for sole-component system with much satisfaction. The maximum adsorption capacity in single system for Cu (II), Pb (II) and Cd (II) was calculated to be 2.27mmol/g, 1.27mmol/g and 0.65mmol/g individually. The initial adsorption rate followed the order as Cu (II)>Pb (II)>Cd (II) at the fixed initial concentration, and for each metal the initial sorption rate increased as the initial concentration increased. In addition, the modified Langmuir model could describe the binary competitive adsorption behavior successfully, with which the interaction coefficient was obtained to follow the order as Cu (II)
ISSN:	0043-1354 1879-2448