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Preparation, characterization of crystalline zirconium phosphates and study on their acid stability and ion exchange behavior with uranyl ions

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Abstract

Two kinds of crystalline zirconium phosphate, α- and γ-ZrP were prepared by direct method, and characterized by means of X-ray powder diffractometry, thermogravimetric analysis and pH titration. The total exchange capacity of α-ZrP and γ-ZrP for Na+ ions determined by pH titration was 8.80 mmol/(g Zr(HPO4)2·6H2O) and 3.80 mmol/(g NH4ZrH(PO4)2·H2O), respectively. The thermodynamic equilibrium constant of exchange reactions

on α-ZrP and

on γ-ZrP at 25.0°C is 2.5 and 1.1, respectively. Although UO 2+2 in solution is more preferred by α-ZrP than by γ-ZrP, the selectivity of α-ZrP for UO 2+2 decreases with decreasing pH value while less effect of pH on the amount of UO 2+2 ions exchanged to γ-ZrP has been found. It is also interesting to find out that both H+ and NH +4 ions in γ-ZrP can be replaced by UO 2+2 ions existed in concentrated solution.

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Author notes

  1. Zhang Hui

    Present address: Lanzhou Institute of Chemistry and Physics, Scientific Academy of P.R. China, P.R. China

Authors and Affiliations

  1. Department of Modern Physics, Lanzhou University, 730000, Lanzhou, Gansu Province, (P.R. China)

    Song Yinjie, Zhang Hui, Yang Qiaoling & Zhao Aimin

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  1. Song Yinjie
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  2. Zhang Hui
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  3. Yang Qiaoling
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  4. Zhao Aimin
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Yinjie, S., Hui, Z., Qiaoling, Y. et al. Preparation, characterization of crystalline zirconium phosphates and study on their acid stability and ion exchange behavior with uranyl ions. Journal of Radioanalytical and Nuclear Chemistry, Articles 198, 375–384 (1995). https://doi.org/10.1007/BF02036553

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  • DOI: https://doi.org/10.1007/BF02036553

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