Abstract
Zirconium oxide, prepared by the action of NH 3 on ZrOCl 2, was subjected to chemical pretreatment with HCl and H 2SO 4 of various concentrations, and samples with a surface phase pH of 3.0–7.0 were prepared. The sorption-desorption behaviour of three anionic dyes, orange II, naphthol blue-black and lissamine green BN, on these substrates is reported. Maximum sorption is shown at pH 2–3 (HCl treated) and pH 4–5 (H 2SO 4 treated). The sorption of the dyes is considered to be a complex process, involving molecular adsorption and anion exchange. The preparative procedure, chemical stability, OH - ion exchange capacity and the effects of time, temperature and regeneration of the substrates with aqueous inorganic electrolytes are described. Our investigations show the role of the anion exchange properties of hydrated zirconium(IV) oxide, after treatment with some mineral acids.
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