Get access

Removal of lead (II) and cadmium (II) from aqueous solutions using spent Agaricus bisporus

Authors

  • Heng Xu,

    1. Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Science, Sichuan University, Chengdu 610064, P. R. China
    Search for more papers by this author
  • Yuxia Chen,

    1. Aro-Technical Extension Centre, Longquanyi Science and Technology Burea, Chengdu 610100, P. R. China
    Search for more papers by this author
  • Haiyan Huang,

    1. Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Science, Sichuan University, Chengdu 610064, P. R. China
    Search for more papers by this author
  • Yingyi Liu,

    1. Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Science, Sichuan University, Chengdu 610064, P. R. China
    Search for more papers by this author
  • Zhirong Yang

    Corresponding author
    1. Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Science, Sichuan University, Chengdu 610064, P. R. China
    • Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Science, Sichuan University, Chengdu 610064, P. R. China.
    Search for more papers by this author

Abstract

The sorption of Pb and Cd from aqueous solutions by spent Agaricus bisporus was investigated. The effects of contact time, pH, ionic medium, initial metal concentration, other metal ions presence and ligands were studied in batch experiments at 25°C. Maximum sorption for both metals was found to occur at an initial pH of around 5.5. The equilibrium process was well described by the Langmuir isotherm model, with maximum sorption capacities of 0.2345 and 0.1273 mmol g−1 for Pb and Cd respectively. Kinetic data followed the pseudo-second-order kinetic model. The presence of NaCl and NaClO4 caused a reduction in Cd sorption, while Pb sorption was not remarkably affected. The presence of other metals did not affect Pb removal, while the Cd removal was much reduced. HCl or EDTA solutions were able to desorb Cd from the spent Agaricus bisporus (SAB) completely, while an approximately 60% and 15% desorption yield was obtained for Pb when HCl 0.01 mol L−1 or EDTA 0.001 mol L−1 were used, respectively. The results of FTIR, SEM and EDX analysis indicated that other mechanisms, such as surface complexation and electrostatic interactions, must be involved in the metal sorption in addition to ion exchange. © 2012 Canadian Society for Chemical Engineering

Ancillary