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Application of bifunctional Saccharomyces cerevisiae to remove lead(II) and cadmium(II) in aqueous solution
Authors:Yunsong ZhangWeiguo Liu  Li ZhangMeng wang  Maojun Zhao
Institution:a Department of Chemistry, College of Life and Science, Sichuan Agricultural University, Yaan 625014, PR China
b Agronomy College, Sichuan Agricultural University, Wenjiang 611130, PR China
Abstract:A magnetic adsorbent, EDTAD-functionalized Saccharomyces cerevisiae, has been synthesized to behave as an adsorbent for heavy metal ions by adjusting the pH value of the aqueous solution to make carboxyl and amino groups protonic or non-protonic. The bifunctional Saccharomyces cerevisiae (EMS) were used to remove lead(II) and cadmium(II) in solution in a batch system. The results showed that the adsorption capacity of the EMS for the heavy metal ions increased with increasing solution pH, and the maximum adsorption capacity (88.16 mg/g for Pb2+, 40.72 mg/g for Cd2+) at 10 °C was found to occur at pH 5.5 and 6.0, respectively. The adsorption process followed the Langmuir isotherm model. The regeneration experiments revealed that the EMS could be successfully reused.
Keywords:Saccharomyces cerevisiae  Nano-Fe3O4  EDTAD  Adsorption  Functionalization
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