Kinetic and isotherm of competitive adsorption cadmium and lead onto Saccharomyces cerevisiae autoclaved cells.

Heavy metal pollution has been regarded as a significant public health hazard during the industrialization, which also have exhibited various types of toxicological manifestations. Moreover, due to the high cost and toxic by-products, some conventional remediation methods were limited to heavy metals pollution control. In this work, autoclaved Saccharomyces cerevisiae was used as a biosorbent for the removal of Cd and Pb from single and binary ions aqueous solution system. The kinetics and isotherm of Cd and Pb were studied in different ion systems. The results showed that the competitive adsorption ability of S. cerevisiae to Pb was stronger than that to Cd in binary ions solution. To all the single ion solution of Cd or Pb and binary ions solution of Cd-Pb, there always existed that the adsorption of metal ions on S. cerevisiae fitted well with pseudo-second-order kinetic model and Langmuir isotherms model. The adsorption quantity q in different solutions followed the sequence as q (Cd-Pb) > q (Pb-single) > q (Pb-binary) > q (Cd-single) > q (Cd-binary). The autoclaved S. cerevisiae used in this research was one kind of rapid and favourable biosorbent for Pb and Cd. In Pb and Cd-containing solutions, sites competition and jointed toxicity of Pb and Cd on S. cerevisiae cells were the key to the total adsorption effect, and further researches were necessary in the next work. Thus, the current research presented that the autoclaved S. cerevisiae could be applied as an effective biosorbent for heavy metal adsorption from water environment and the design of eco-friendly technologies for the treatment of waste liquor.