Adsorption kinetics of Pb and Cd by two plant growth promoting rhizobacteria

S. C. WU, X. L. PENG, K. C. CHEUNG, S. L. LIU, Ming Hung WONG

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A bench study was carried out to characterize the kinetics of two plant growth promoting rhizobacteria (PGPR) Azotobacter chroococcum and Bacillus megaterium to adsorb heavy metals from solution. Adsorption of Pb²⁺ and Cd²⁺ by bacterial cells was processed quickly with an equilibration achieved within 5 min. The adsorptions were fitted well with Freundlich and Langmuir isotherm models. The comparison of isotherm parameters indicated that A. chroococcum had a stronger capacity to bind metal ions than B. megaterium, with an average increase of 59.8% for Pb²⁺ and 75.6% for Cd²⁺, respectively. Both bacteria had a stronger affinity to Pb²⁺ than Cd²⁺ since Pb²⁺ was more easily bound with the phosphoryl groups on the cell surface than Cd²⁺. This demonstrated that the presence of bacteria in the rhizosphere may result in the reduction of mobile ions in soil solution. Copyright © 2009 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)4559-4563
JournalBioresource Technology
Issue number20
Publication statusPublished - Oct 2009


Wu, S. C., Peng, X. L., Cheung, K. C., Liu, S. L., & Wong, M. H. (2009). Adsorption kinetics of Pb and Cd by two plant growth promoting rhizobacteria. Bioresource Technology, 100(20), 4559-4563. doi: 10.1016/j.biortech.2009.04.037


  • Adsorption
  • Bacteria
  • Heavy metals ion
  • Medal binding capacity


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