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Influence of metal ionic characteristics on their biosorption capacity by Saccharomyces cerevisiae

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Abstract

The influence of metal ionic characteristics on their biosorption capacity was analyzed using quantitative structure–activity relationships model. The waste biomass of Saccharomyces cerevisiae was used as biosorbent to adsorb 10 kinds of metal ions, and their maximum biosorption capacity (q max) was determined by the Langmuir isotherm model. The values of q max decreased in the following order (in millimole per gram): Pb2+ (0.413) > Ag+ (0.385) > Cr3+ (0.247) > Cu2+ (0.161) > Zn2+ (0.148) > Cd2+ (0.137) > Co2+ (0.128) > Sr2+ (0.114) > Ni2+ (0.108) > Cs+ (0.092). Twenty-two parameters of physiochemical characteristics of metal ions were selected and correlated with q max, i.e., OX, AN, r (Å), ΔIP (eV), ΔE 0 (V), X m, |log K OH|, \( X^{2}_{{\text{m}}} r \), Z 2/r, AN/ΔIP, \( \sigma _{\rho } \), AR, AW, IP, AR/AW, Z/r 2, Z/AR2, Z/r, Z/AR, Z*2/r·, Z*, N. The linear regression analysis showed that the covalent index \( X^{2}_{{\text{m}}} r \) was correlated well with q max for all metal ions tested in the following equation: q max = 0.029 + 0.061 (\( X^{2}_{{\text{m}}} r \)) (R 2 = 0.70). It suggested that the greater the covalent index value of metal ion was, the greater the potential to form covalent bonds with biological ligands, such as sulphydryl, amino, carboxyl, hydroxyl groups, etc. on the biomass surface, and the higher the metal ion biosorption capacity was. Classification of metal ions, for divalent ion or for soft–hard ion could improve the linear relationship (R 2 = 0.89). The equation could be used to predict the biosorption capacity of metal ions.

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Acknowledgments

The work was financially supported by the National Natural Science Foundation of China (grant no. 50278045) and the Basic Research Fund of Tsinghua University (grant no. JC2002054).

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Correspondence to Jianlong Wang.

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Chen, C., Wang, J. Influence of metal ionic characteristics on their biosorption capacity by Saccharomyces cerevisiae . Appl Microbiol Biotechnol 74, 911–917 (2007). https://doi.org/10.1007/s00253-006-0739-1

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Keywords

  • Biosorption
  • Ionic characteristics
  • Saccharomyces cerevisiae
  • QSAR