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The Effects of γ-Irradiation on the Electrokinetic and Thermal Behaviour of Zirconium Hydroxide

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Abstract

Zirconium hydroxide particles produced by rapid precipitation at pH 10.4, 7 or 2 were subjected toγ-irradiation up to a final dose of 20 MGy. The effects of the γ-irradiation were examined by X-ray powder diffraction, laser Raman spectroscopy, differential scanning calorimetry and microelectrophoretic measurements. It was found that γ-irradiation had no influence on the behaviour of zirconium hydroxide during calcination and subsequent cooling. The results of microelectrophoretic measurements showed that γ-irradiation influences the surface properties of zirconium hydroxide as a function of the precipitation pH. Zirconium hydroxide precipitated at pH 2 proved to be the most susceptible to γ-irradiation, while the sameγ-irradiation had very little (if any) effect on the surface properties of zirconium hydroxide precipitated at pH 10.5. After γ-irradiation, the electrophoretic mobility of zirconium hydroxide precipitated at pH 2 was increased at both low and high pH, thereby indicating an increase in its adsorption capacity. The analogy observed between the pH-dependence of the effects of γ-irradiation on the electrokinetic behaviour of zirconium hydroxide and the influence of ball-milling on the thermal behaviour of zirconium hydroxide [8] suggested that the susceptibility of amorphous zirconium hydroxide increases with decrease of the precipitation pH.

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Authors and Affiliations

  1. Rudjer Bošković Institute, P. O. Box 1016, 10001, Zagreb, Croatia

    S. Musić, G. Štefanić, N. Vdović & A. Sekulić

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  1. S. Musić
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  2. G. Štefanić
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  3. N. Vdović
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  4. A. Sekulić
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Musić, S., Štefanić, G., Vdović, N. et al. The Effects of γ-Irradiation on the Electrokinetic and Thermal Behaviour of Zirconium Hydroxide. Journal of Thermal Analysis and Calorimetry 59, 837–846 (2000). https://doi.org/10.1023/A:1010166123511

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