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Removal of lead (II) and cadmium (II) from aqueous solutions using spent Agaricus bisporus
Author(s) -
Xu Heng,
Chen Yuxia,
Huang Haiyan,
Liu Yingyi,
Yang Zhirong
Publication year - 2013
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.21671
Subject(s) - sorption , chemistry , agaricus bisporus , aqueous solution , cadmium , desorption , langmuir adsorption model , nuclear chemistry , metal , metal ions in aqueous solution , ion exchange , ionic strength , adsorption , biosorption , ionic bonding , inorganic chemistry , ion , organic chemistry , mushroom , food science
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 NaClO 4 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