Partially carboxymethylated and partially cross-linked surface of chitosan versus the adsorptive removal of dyes and divalent metal ions

Bhairavi Doshi, Ali Ayati, Bahareh Tanhaei, Eveliina Repo, Mika Sillanpää

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)

Abstract

Industrial wastes and their effluents containing dyes and heavy metals are a tremendous threat to the environment, and to treat these toxic waste streams, effective and environmentally benign methods are needed. In this study, NaCS-GL was used as an effective adsorbent, for the removal of dyes and metal ions from their aqueous solution. The presence of carboxylate groups on the NaCS-GL surface has altered the protonation of amino groups. The adsorption kinetics of dyes on NaCS-GL was initially controlled by the film diffusion or chemical reaction after which the intra-particle or pore diffusion started to govern the rate. Leaching of sodium ion confirmed the crosslinking of two carboxylate groups of NaCS-GL with the metal ions. Modeling of the adsorption isotherms revealed that the different active surface sites of NaCS-GL were involved in the adsorption of dyes and metals, suggesting the simultaneous removal of these components from the wastewater.

Original languageEnglish
Pages (from-to)586-597
Number of pages12
JournalCarbohydrate Polymers
Volume197
DOIs
Publication statusPublished - 1 Oct 2018
Externally publishedYes

Keywords

  • Adsorption
  • Carboxymethyl chitosan
  • Dyes and metal ions
  • Glutaraldehyde crosslinked
  • Modeling
  • Sodium leaching

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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