Adsorption behavior and mechanism of cadmium on strong-acid cation exchange resin

The adsorption behavior of Cd 2+ on 001×7 strong-acid cation exchange resin was studied with the static adsorption method. The adsorption process was analyzed from thermodynamics and kinetics aspects. The influences of experimental parameters such as pH, temperature, initial concentration and adsorp...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2009-06, Vol.19 (3), p.740-744
Main Authors: WANG, Fei, WANG, Lian-jun, LI, Jian-sheng, SUN, Xiu-yun, HAN, Wei-qing
Format: Article
Language:English
Subjects:
adsorption
cadmium
kinetics
strong-acid cation exchange resin
thermodynamics
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Summary:The adsorption behavior of Cd 2+ on 001×7 strong-acid cation exchange resin was studied with the static adsorption method. The adsorption process was analyzed from thermodynamics and kinetics aspects. The influences of experimental parameters such as pH, temperature, initial concentration and adsorption rate were investigated. The experimental results show that in the studied concentration range, 001×7 resin has a good sorption ability for Cd 2+, and the equilibrium adsorption data fit to Freundlich isotherms. The adsorption is an exothermic process which runs spontaneously. Kinetic analysis shows that the adsorption rate is mainly governed by liquid film diffusion. The best adsorption condition is pH 4–5. The saturated resin can be regenerated by 3 mol/L nitric acid, and the desorption efficiency is over 98%. The maximal static saturated adsorption capacity is 355 mg/g (wet resin) at 293 K. The adsorption mechanism of Cd 2+ on 001×7 resin was discussed based on IR spectra.
ISSN:1003-6326
DOI:10.1016/S1003-6326(08)60343-X