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An investigation on the preparation of nanocrystalline hydrous zirconia from zirconium tungstate

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Abstract

Hydrous nanocrystalline zirconia was prepared from an unusual precursor—the bimetallic oxide zirconium tungstate (ZrW2O8)—in alkaline medium. Different experimental conditions (NaOH concentration, time and temperature) were used to investigate the effects on crystallographic, morphological, chemical and thermal characteristics of the products. The resulting materials are composed of particles with a crystal structure similar to that of cubic ZrO2 (or a mixture of tetragonal and cubic phases, depending on the synthesis conditions), with particle size around 5 nm and crystallites around 3 nm in diameter. These particles form high surface area agglomerates, exhibiting mesoporosity and capacity for adsorption of water and carbon dioxide. The synthesis mechanism appears to be constituted, first, by a chemical substitution reaction between the WO4 tetrahedra and hydroxyl ions, with subsequent solubilization of the structure. Indeed, excess hydroxyls in the medium form colloidal zirconium ions which polymerize/condense, generating crystalline nuclei in a process facilitated by heterogeneous nucleation and supersaturation. The presence of residual tungsten in all samples appears to be a key element for stabilizing the size and crystalline structure of the materials produced.

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Acknowledgments

The authors acknowledge financial support from the Brazilian agencies Fundação de Amparo à Pesquisa do Rio Grande do Sul (FAPERGS), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, research grants #304831/2014-0 (CAP) and #304675/2015-6 (JEZ)), and Secretaria de Desenvolvimento Econômico, Ciência e Tecnologia do Estado do Rio Grande do Sul (SDECT). Thanks are due also to Netzsch Gerätebau GmbH, Fernanda Miotto (Universidade de Caxias do Sul), João Fiori and Rebecca Lewin (Bruker AXS GmbH) for X-ray microfluorescence analysis, and also to the staff of the Laboratório Central de Microscopia Professor Israel Baumvol (LCMic/UCS) and Instituto de Materiais Cerâmicos (IMC/UCS), particularly Robinson C. D. Cruz, Daniel Golle and Márcia Raquel H. Wendler, for technical assistance and helpful discussions.

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Correspondence to J. E. Zorzi.

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ESM 1

Compositional images obtained by X-ray microfluorescence (Fig. S1), Raman spectra (Fig. S2), Gaussian fits of the mass spectrometric curves (Fig. S3 and Tables S1-S3), and the αs-plot used for the external area and microporous volume calculation based on nitrogen adsorption isotherms (Fig. S4). (DOCX 1343 kb)

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Antunes, M., Perottoni, C.A., Gouvêa, D. et al. An investigation on the preparation of nanocrystalline hydrous zirconia from zirconium tungstate. J Nanopart Res 20, 25 (2018). https://doi.org/10.1007/s11051-017-4119-9

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  • DOI: https://doi.org/10.1007/s11051-017-4119-9

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