Química Nova (Jan 2007)

Remoção de chumbo(II) em sistemas descontínuos por carvões ativados com ácido fosfórico e com vapor Lead(II) removal in discontinous systems by carbon activated by phosphoric acid and vapor

  • Cristiane Imenes de Campos Bueno,
  • Wagner Alves Carvalho

DOI
https://doi.org/10.1590/S0100-40422007000800022
Journal volume & issue
Vol. 30, no. 8
pp. 1911 – 1918

Abstract

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Adsorption of heavy metal cations by activated carbon is dependent on the capacity of the material in promoting adsorption and the time needed to reach equilibrium. Carbon samples were previously activated either by phosphoric acid treatment at 400 ºC or by steam at 800 ºC. The results of Pb(II) adsorption by these activated carbons have shown that equilibrium was typically reached within the first 5 min of contact between carbon and metal solution, with a maximum adsorption capacity higher than 69 mg g-1 for the vapor-activated sample. Temperature influences the sorption capacity, which corresponds to an endothermic process. Lead(II) retention is more pronounced at high temperature and low pH.

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