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Water, Air, and Soil Pollution

, Volume 142, Issue 1–4, pp 357–373 | Cite as

Removal of Copper and Cadmium Ions from Diluted Aqueous Solutions by Low Cost and Waste Material Adsorbents

  • Mihaela Ulmanu
  • Elena Marañón
  • Yolanda Fernández
  • Leonor Castrillón
  • Ildiko Anger
  • Daniela Dumitriu
Article

Abstract

The sorption of copper and cadmium ions using activated carbon,kaolin, bentonite, diatomite and waste materials such as compost,cellulose pulp waste and anaerobic sludge as sorbents is reported. Equilibrium isotherms were obtained for the adsorption of these metals in single and binary solutions. Bentonite presented the highest adsorption capacities for both copper and cadmium. A competitive uptake was observed when both metals are present; copper being preferentially adsorbed by all materials with theexception of anaerobic sludge. Equilibrium data were fitted toLangmuir and Freundlich models, with satisfactory results for most of the adsorbent-metal systems studied.Of all the adsorbents studied, bentonite and compost presentedthe highest removal efficiencies, reaching 99% for copper whencadmium is also present, for initial solution concentrations ofup to 100 mg L-1. Anaerobic sludge has a greater preferencefor cadmium, even in the presence of copper, with removal efficiencies of 98% for similar concentrations to those mentioned above.

adsorbents cadmium copper isotherms removal waste materials 

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Mihaela Ulmanu
    • 1
  • Elena Marañón
    • 2
  • Yolanda Fernández
    • 2
  • Leonor Castrillón
    • 2
  • Ildiko Anger
    • 1
  • Daniela Dumitriu
    • 1
  1. 1.Institute for Non-ferrous and Rare MetalsBucharestRomania
  2. 2.Department of Chemical Engineering and Environmental Technology, Higher School of Industrial EngineeringUniversity of OviedoGijónSpain (author for correspondence

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