Abstract
The effects of EDTA on the adsorption of Zn(II) onto various hydrous aluminosilicates was investigated. Two major types of aluminosilicates, amorphous (Zeosyl 100, Zeo 49, Zeolex 23 and Blazer), and crystalline (Zeolite A and Mordenite) and two simple oxides (SiO 2 and Al 2O 3) were studied. Adsorption of EDTA occurred in the acidic pH range and was more pronounced for solids with a low silica to aluminum ratio. The adsorption of EDTA is brought by specific interactions with the surface hydroxyl groups. Solids with a high Si/Al ratio have negatively charged sites, hence little adsorption of EDTA. Depending on the types of solids, the addition of EDTA resulted in a shift of maximum Zn(II) adsorption to the acidic pH range, and reduction of zeta potential. In general, Zn(II) removal in the presence of EDTA was significantly reduced at the alkaline pH range, and slightly enhanced in the acidic pH range. Zn(II) removal in the presence of EDTA is associated with Zn-EDTA complex for γ-alumina. For aluminosilicates, Zn(II) removal may follow an ion exchange process with either free Zn(II) or complex Zn-EDTA, and to some extent, specific adsorption at constant potential sites.
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