The Malaysian Journal of Analytical Sciences Vol 15 No 1 (2011): 8 - 21

 

 

 

REMOVAL OF Zn(II), Cd(II) AND Mn(II) FROM AQUEOUS SOLUTIONS

BY ADSORPTION ON MAIZE STALKS

 

G. O. El-Sayed1*, H. A. Dessouki 1 and  S. S. Ibrahiem2

 

1 Chemistry Department, Faculty of Science,

Benha University, Benha, Egypt

2 National Water Research Center, Central Lab. for Environ. Qual. Monit.,

 Elqanater Elkhayria, Egypt

 

*Corresponding author: gamaloelsayed@yahoo.com

 

 

Abstract

The potential to remove Zn(II), Cd(II) and Mn(II) from aqueous solutions through biosorption using maize stalks as an agriculture waste, was investigated in batch experiments. Different factors influencing metal adsorption such as contact time, initial metal ion concentration (40–1000 mg/L), pH (1–8), ionic strength and temperature (298–328 K) were investigated. The adsorption process was relatively fast and equilibrium was established after about 90 min. The optimum initial pH for zinc, cadmium and manganese adsorption by maize stalks was 7.0, 6.0 and 5.0, respectively. Under optimum conditions, the maximum adsorption capacity of zinc, cadmium and manganese ions was 30.30, 18.05 and 16.61 mg metal/g dry biomass, respectively. In order to investigate the sorption isotherm, three equilibrium models, Langmuir Freundlich and Temkin isotherms, were analyzed. The adsorption process for the three metal ions was found to be exothermic in nature. Free energy of adsorption (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) changes were calculated.

 

Keywords: maize stalks; metal removal; cadmium; manganese; zinc

 

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