Journal
CARBOHYDRATE POLYMERS
Volume 256, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.117589
Keywords
Chitosan; Dinucleating complexing agent; Kinetics; Adsorption; Biopolymer; Metals
Categories
Funding
- CNPq
- CAPES [001]
- LINDEN/UFSC
Ask authors/readers for more resources
The study focused on adsorption of Zn(II), Cu(II), and Ni(II) ions using a heptadentate dinucleating ligand anchored to chitosan. The adsorbent was characterized by various spectroscopic and surface area analysis methods, and resulted in a ligand substitution degree of 0.73 in chitosan. Adsorption kinetics followed a pseudo-second-order model, with Cu(II) showing preferential adsorption among the ions studied.
The preconcentration of metal ions present at low concentration levels in aqueous systems and the selective removal of potentially toxic metals are important applications of adsorption processes. In this study, a heptadentate dinucleating ligand was anchored to chitosan for use in adsorption studies on Zn(II), Cu(II) and Ni(II) ions. The novel adsorbent was characterized by C-13 NMR and FT-IR spectroscopy, TGA and BET surface area analysis. The degree of substitution of the ligand in chitosan, obtained from CHN analysis, was 0.73. The adsorption kinetics followed a pseudo-second-order model. The rate constants and the adsorption capacities for multicomponent systems decreased in the order Cu(II) >> Ni(II) similar to Zn(II), indicating the preferential adsorption of Cu(II). For Cu(II) ions, the Langmuir model provided the best fitting to the experimental data, and the monolayer Cu(II) adsorption capacity was 0.404 mmol g(-1), while the linear isotherm described Zn(II) and Ni(II) ion adsorption.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available