Preparation and characterization of chitosan encapsulated Sargassum sp. biosorbent for nickel ions sorption

Fan Yang, Huijuan Liu*, Jiuhui Qu, J. Paul Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

A new biosorbent - Sargassum sp. encapsulated with epichlorohydrin (ECH) cross-linked chitosan (CS) was investigated for nickel ions removal. The prepared biosorbent with Sargassum sp. to cross-linked chitosan of 3 (weight ratio) had the highest sorption capacity. The biosorption kinetics can be well fitted by the diffusion-controlled model. The organic leaching of CS was 77-88% less than that of algae at different pH. The biosorption capacity of nickel on CS was much higher than that of cross-linked chitosan (CLC) bead and lower than that of raw algae due to encapsulation. In addition, the reusability of CS was further evaluated and confirmed through five adsorption-desorption cycles. Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) analysis demonstrated that the nickel ions sequestration mechanism included ion exchange and nickel complexation with the carboxyl, amino, alcoholic and ether groups in CS.

Original languageEnglish
Pages (from-to)2821-2828
Number of pages8
JournalBioresource Technology
Volume102
Issue number3
DOIs
StatePublished - Feb 2011

Keywords

  • Biosorption
  • Chitosan
  • Immobilization
  • Nickel
  • Sargassum sp.

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