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Cd(II) biosorption using Lessonia kelps.

Carmen Boschi1, Holger Maldonado, Martha Ly

  • 1Ecole des Mines d'Alès, Laboratoire Génie de l'Environnement Industriel, Equipe BPCI, 6 avenue de Clavières, F-30319 ALES cedex, France.

Journal of Colloid and Interface Science
|March 8, 2011
PubMed
Summary

Lessonia kelps effectively recover cadmium (Cd(II)) from neutral solutions. Pre-treated biomass showed high sorption capacities, with L. trabeculata exhibiting superior performance for cadmium removal.

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Area of Science:

  • Environmental Science
  • Biotechnology
  • Materials Science

Background:

  • Heavy metal pollution, particularly cadmium (Cd(II)), poses significant environmental risks.
  • Bioremediation using natural adsorbents offers a sustainable approach for metal recovery.
  • Lessonia kelps present a potential low-cost biosorbent for cadmium remediation.

Purpose of the Study:

  • To evaluate the efficacy of Lessonia kelps (L. trabeculata and L. nigrescens) for Cd(II) recovery.
  • To characterize the modified biomass and understand sorption mechanisms.
  • To optimize conditions and assess kinetic parameters for cadmium sorption.

Main Methods:

  • Biomass pre-treatment with calcium chloride for stabilization.
  • Scanning Electron Microscopy-Energy Dispersive X-ray Analysis (SEM-EDAX) and Fourier-Transform Infrared (FT-IR) spectrometry for material characterization.
  • Sorption isotherm and kinetic studies under varying conditions (pH, temperature, particle size, sorbent dosage, metal concentration).

Main Results:

  • Maximum sorption capacities of 1 mmol Cd g(-1) for L. nigrescens and 1.5 mmol Cd g(-1) for L. trabeculata were achieved at pH 6.
  • Langmuir isotherm model provided a good fit to the experimental data.
  • Intraparticle diffusion (Crank equation) was the rate-limiting step, influenced by sorbent dosage and metal concentration, but less so by temperature and particle size.

Conclusions:

  • Lessonia kelps are effective biosorbents for cadmium recovery from near-neutral solutions.
  • Calcium chloride pre-treatment enhances biomass stability and sorption potential.
  • The study provides valuable insights into the application of kelp biomass for heavy metal remediation.