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Adsorption of Pb 2+ ions by Activated carbons obtained from Maize cobs by Chemical activation with ZnCl2: Role of Physical and Chemical properties

Author Affiliations

  • 1Faculty of Sciences, Department of Chemistry, University of Douala, 24157-Douala, CAMEROON
  • 2Faculty of Sciences, Department of Inorganic Chemistry, University of Yaounde I, 812-Yaoundé, CAMEROON

Res.J.chem.sci., Volume 5, Issue (5), Pages 33-45, May,18 (2015)


The evaluation of the effectiveness of adsorption of activated carbons obtained from maize cobs by chemical activation with zinc chloride in removing lead(II) ions commonly found in municipal water in Cameroon was investigated. Batch experiments were conducted to study the effect of the contact time and initial concentration of Pb(II) ions for five maize cobs activated carbons and for a commercial one. The properties of the studied materials are correlated to their adsorption capacities. The carbon obtained from the hard part of the cob is the one which adsorbs best Pb2+. Its adsorption percentage at 60 ppm is 32.97% and itsKd-value about 0.45 cm/mg. The commercial sample with an adsorption percentage of about 99% and kd-value of about 97.73 cm/mg is by far the best adsorbent. The intraparticle diffusion seems to be the rate-limiting step.


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