Copper, mercury and chromium adsorption on natural and crosslinked chitosan films: An XPS investigation of mechanism
By R. Vieira, M. L. Oliveira, E. Guibal, E. Rodriguez-castellon, M. M. Beppu. 2011
314 citations recorded by the source corpus.
Abstract Although biopolymers are focusing the attention of researchers as potential adsorbents for heavy metal removal, little information is given about the properties of the resulting complexes. This information would also bring a better understanding of the mechanisms involved in metal binding to the polymer. XPS (X-ray photo-electron spectroscopy) is a powerful technique to investigate how metal ions bind onto these matrices. In this study, copper, chromium and mercury ions were adsorbed on natural and crosslinked (glutaraldehyde and epichlorohydrin) chitosan matrices, which present diverse functional groups and may induce different adsorption mechanisms. X-ray photoelectron spectroscopy (XPS) revealed that these metals bind to glutaraldehyde-crosslinked chitosan, differently from the other two kinds of matrices. Hence, amino group availability and the formation of new structures such as imino bonds are key factors. Copper(II) stabilization was found to be poor in glutaraldehyde-crosslinked chitosan. Conversely, Hg(II) ions present higher adsorption capacity in this kind of matrix. Chromium(VI) was reduced in all three matrices. In this case, chromium(VI) is probably not well stabilized by the functional groups of these polymers and may also undergo the action of their reducing groups.
Subfields: Analytical Chemistry, Mechanical Engineering, Surfaces, Coatings and Films
View Paper: https://www.semanticscholar.org/paper/057756183366a5b460f8b53a20f0315e8b9d68fd
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Analytical Chemistry
Citations in the corpus
- Remediation of Heavy Metals by Biomolecules: A Review (2015, background): “These heavy metals can be coordinated thanks to the hydroxyl and amine groups of chitosan, which plays the role of ligand (Vieira et al., 2011).”