Synthesis and Characterization of the Layered Zirconium Arsenate Zr2O3(HAsO4)·nH2O
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Layered sodium zirconium arsenate of composition Zr2O3(NaAsO4)·3H2O was prepared by the reaction between Zr(OC3H7)4 and sodium arsenate in alkaline media (pH > 12) under mild hydrothermal conditions (180-200°C). Two hydrogen forms of the zirconium arsenate (Ψ-ZrAs) Zr2O3(HAsO4)·3H2O and Zr2O3(HAsO4)·H2O, were prepared by acid treatment of the sodium form. The intercalation of n-alkylamines into the Ψ-ZrAs from the gas phase was studied. The synthesized materials were characterized by elemental analysis, thermogravimetric analysis, infrared spectroscopy and powder X-ray diffraction. The data indicate that the zirconium arsenate is isostructural to Ψ-Zr2O3(HPO4)·nH2O (n = 0.5, 1.5). The new compounds exhibit high hydrolytic stability in alkaline media. The ion exchange behavior of the Ψ-Zr2O3(HAsO4)·3H2O towards alkali, alkaline-earth, and some di- and tri-valent metal cations in different solutions was studied over a wide pH range (2-14) by the batch technique. © 1998 Elsevier Science Ltd.
author list (cited authors)
Bortun, A. I., Bortun, L. N., Clearfield, A., Trobajo, C., & Garcı́a, J. R.