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      Comparative analysis of the biosorption of cadmium, lead, nickel, and zinc by algae.

      1 , , , ,
      Environmental science & technology

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          Abstract

          Thirty strains of algae were examined for their biosorption abilities in the uptake of cadmium, lead, nickel, and zinc from aqueous solution. A wide range of adsorption capacities between the different strains of algae and between the four metals can be observed. The cyanophyceae Lyngbya taylorii exhibited high uptake capacities for the four metals. The algae showed maximum capacities according to the Langmuir Adsorption Model of 1.47 mmol lead, 0.37 mmol cadmium, 0.65 mmol nickel, and 0.49 mmol zinc per gram of dry biomass. The optimum pH for L. taylorii was between pH 3 and 7 for lead, cadmium, and zinc and between pH 4 and 7 for nickel. Studies with the algae indicated a preference for the uptake of lead over cadmium, nickel, and zinc in a four metal solution. The metal binding abilities of L. taylorii could be improved by phosphorylation of the biomass. The modified biosorbent demonstrated maximum capacities of 2.52 mmol cadmium, 3.08 mmol lead, 2.79 mmol nickel, and 2.60 mmol zinc per gram of dry biomass. Investigations with phosphated L. taylorii indicated high capacities for the four metals also at low pH. The selectivity remained quite similar to the unmodified algae.

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          Author and article information

          Journal
          Environ. Sci. Technol.
          Environmental science & technology
          0013-936X
          0013-936X
          Nov 01 2001
          : 35
          : 21
          Affiliations
          [1 ] Institute of Food Chemistry, Technical University Berlin, Germany.
          Article
          10.1021/es010063x
          11718343
          db7b6bc5-b704-416c-8bfd-96e7fbf2b2ef
          History

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