African Journal of
Environmental Science and Technology

  • Abbreviation: Afr. J. Environ. Sci. Technol.
  • Language: English
  • ISSN: 1996-0786
  • DOI: 10.5897/AJEST
  • Start Year: 2007
  • Published Articles: 894

Full Length Research Paper

Lead removal in aqueous solution by activated carbons prepared from Cola edulis shell (Alocacée), Pentaclethra macrophylla husk (Mimosaceae) and Aucoumea klaineana sawdust (Burseraceae)

François Eba1*, Raphinos Kouya Biboutou1, Joseph Ndong Nlo1, Yvon G. Bibalou1 and Michel Oyo2
  1Laboratoire Pluridisciplinaire des Sciences (LAPLUS), Ecole Normale Supérieure BP 17009 Libreville-Gabon.     2Laboratoire de Géo-Guide BP 20489 Libreville-Gabon.  
Email: [email protected]

  •  Accepted: 05 January 2011
  •  Published: 30 March 2011

Abstract

 

Three activated carbons prepared from vegetable matters of Gabonese biomass are being investigated as adsorbents for the removal of Pb (II) ions from aqueous solutions by means of batch technique. The equilibrium adsorption level was determined to be a function of pH, contact time, temperature and adsorbent dosage. The experimental adsorption data are well applicable to both Freundlich and Langmuir models with the correlation coefficients higher than 0.9. The adsorption process followed the pseudo second order kinetics (R2>0. 9). The enthalpy change [∆H = 41.237 kJ for activated carbon prepared from Cola edulisshell (CAo°), -3.963 kJ/mol for activated carbon prepared from Pentaclethra macrophyllahusk (GAo) and -1.6 kJ/mol for activated carbon prepared from Aucoumea klaineanasawdust (QAo)] implied that the adsorption was endothermic and exothermic for CAo and GAo or QAo, respectively.


Key words: Vegetable carbons, surface functional group, adsorption capacity, Pb(II) ions, isotherms.

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