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Sorption properties of chelating polymer–clay nano‐composite resin based on iminodiacetic acid and montmorillonite: water absorbency, metal ion uptake, selectivity, and kinetics
Author(s) -
Urbano Bruno F.,
Rivas Bernabé L.
Publication year - 2014
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4109
Subject(s) - montmorillonite , iminodiacetic acid , sorption , adsorption , ion exchange , metal ions in aqueous solution , langmuir adsorption model , chemistry , langmuir , aqueous solution , chemical engineering , inorganic chemistry , polymer chemistry , metal , chelation , organic chemistry , ion , engineering
BACKGROUND This paper presents the study of the sorption performance of a novel poly[ N ‐(4‐vinylbenzyl)‐iminodiacetic acid)‐montmorillonite nano‐composite. The composite was obtained through in situ polymerization of the previously synthesized monomer N ‐(4‐vinylbenzyl)‐iminodiacetic acid in the presence of organic‐modified montmorillonite and N,N ‐methylene‐ bis ‐acrylamide.RESULTS The water uptake of the nanocomposites increased with increasing montmorillonite content. Metal ion retention studies as a function of montmorillonite content showed an unexpected trend in which the adsorption capacities decreased as the montmorillonite content increased. Selectivity experiments reveals that composites present a certain selectivity towards Cu 2+ and that montmorillonite content does not provide selectivity to the composite. Kinetic experiments were conducted using a Cu 2+ aqueous solution at pH 5.0 and it was observed that after 60 min contact the maximum retention is reached. Kinetics and diffusion models reveal that the metal ion retention occurs mainly at the surface of resin particles, suggesting a film diffusion process.CONCLUSION The nano‐composite showed the ability to remove metal ions. The process can be described by a Langmuir isotherm, whereas kinetic studies indicated that the pseudo‐second‐order model could describe the sorption process. The intra‐particle diffusion model suggests that sorption mechanism is film diffusion. © 2013 Society of Chemical Industry