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 language | English |
|---|---|
| Pages (from-to) | 2821-2828 |
| Number of pages | 8 |
| Journal | Bioresource Technology |
| Volume | 102 |
| Issue number | 3 |
| DOIs | |
| State | Published - Feb 2011 |
| Externally published | Yes |
Keywords
- Biosorption
- Chitosan
- Immobilization
- Nickel
- Sargassum sp.
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