Journal
CHEMICAL ENGINEERING JOURNAL
Volume 139, Issue 3, Pages 437-444Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2007.08.005
Keywords
heavy metals; humic acids; zeolite MCM-22; activated carbon; competitive adsorption
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Zeolitic MCM-22 and activated carbon have been used as adsorbents for removal of heavy metals (Cu(2+) and Pb(2+)) and humic acid from aqueous solution. The adsorption behaviour has been investigated in single- and binary-adsorbate systems and the effect of humic acid on metal adsorption was obtained. It is found that the MCM-22 and activated carbon are effective in metal ion and humic acid adsorption. In single component system, the MCM-22 presents the adsorption capacities of Cu(2+), Pb(2+), and humic acid at 33, 94, and 78 mg/g, respectively, while the activated carbon exhibits the adsorption capacities of Cu(2+), Pb(2+), and humic acid at 12, 61, and 74 mg/g, respectively, lower than those on the MCM-22. Solution pH will significantly influence the adsorption. Cu(2+) and Pb(2+) adsorption will increase with increasing pH while humic acid shows a decreasing trend as pH is increased. In binary-adsorbate system, metal-humic acid interaction will affect the adsorption of metal and humic acid on the MCM-22 and activated carbon. On the MCM-22, Cu(2+), Pb(2+) will present competitive adsorption with humic acid. On the activated carbon, Pb(2+) and humic acid also exhibit competitive adsorption, while Cu(2+) and humic acid will have a complexation effect, resulting in an increase of Cu(2+) adsorption on the activated. (C) 2007 Elsevier B.V. All rights reserved.
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