Cadmium and lead removal efficiency of chitosan with different degree of deacetylation in flake and bead form
Cadmium and lead removal efficiency of chitosan with different degree of deacetylation in flake and bead form
Date
2017
Authors
Laly, S.J.
Priya, E.R.
Binsi, P.K.
Zynudheen, A.A.
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Abstract
The unique properties of chitosan such as adsorption, non-toxicity, porosity, polyelectrolytic
nature and polyfunctionality make it an ideal cost effective bioadsorbant for heavy metals. As
the degree of deacetylation (DDA) of chitosan largely affects its properties, a study was carried
out to compare heavy metal (Cd and Pb) adsorption efficacy of chitosan of different DDA (78.2,
86, 90.2 & 94.2 %) in flake and bead form. SEM images and FT-IR spectra revealed the
characteristics of flakes and beads studied. Heavy metal concentration was determined using
ICP-OES. At pH 7 flake and bead having DDA of 90.2 exhibited maximum removal efficiency of
Cd. While in the case of Pb removal efficiency flake (78.2 DDA) and bead (78.2 & 86 DDA)
types were higher. Maximum efficiency of flakes was observed at contact time of 60 min and at
an initial concentration of 5 mg/L, but it was varying between bead types.
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Citation
J. Polym. Mater. 34(1):275-286