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<p>Sorption of Mo(VI) from aqueous solutions onto nano zirconium hydroxide gels was studied using <sup>99</sup>Mo radiotracer. The acid–base titration curves showed that the prepared nano Zr(OH)<sub>4</sub> gels, Gel #1 and Gel #2, were amphoteric materials with points of zero charge (PZC’s) at pH 2.8 and 3.3, respectively. The highest distribution coefficients of molybdate(VI)-<sup>99</sup>Mo between both gels (Gel #1 and Gel #2) and Cl<sup>−</sup> media were achieved at pH 2. The maximum sorption capacities of Gel #1 and Gel #2 were found to be 165.7 ± 7.5 and 195.4 ± 8.1&#xa0;mg Mo/<i>g</i>, respectively. The prepared <sup>99</sup>Mo/<sup>99m</sup>Tc chromatographic column generator based on Gel #2 (achieving the higher Mo capacity) showed a good performance; the <sup>99m</sup>Tc elution yield was 82.7 ± 2.0%, pH of the eluate ranged from 5 to 6.8, and <sup>99</sup>Mo breakthrough in the eluted <sup>99m</sup>Tc was 0.005 ± 0.002% with a radiochemical purity of 97.3 ± 0.9% (as <sup>99m</sup>TcO<sub>4</sub><sup>−</sup>).</p>

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Nano zirconium hydroxide gel as a sorbent material for 99Mo/99mTc radioisotope generator

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  • 发表日期：

    2025年1月7日

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  • H. E. Ramadan,
  • M. A. El-Amir,
  • M. Mostafa

摘要

Sorption of Mo(VI) from aqueous solutions onto nano zirconium hydroxide gels was studied using 99Mo radiotracer. The acid–base titration curves showed that the prepared nano Zr(OH)4 gels, Gel #1 and Gel #2, were amphoteric materials with points of zero charge (PZC’s) at pH 2.8 and 3.3, respectively. The highest distribution coefficients of molybdate(VI)-99Mo between both gels (Gel #1 and Gel #2) and Cl− media were achieved at pH 2. The maximum sorption capacities of Gel #1 and Gel #2 were found to be 165.7 ± 7.5 and 195.4 ± 8.1 mg Mo/g, respectively. The prepared 99Mo/99mTc chromatographic column generator based on Gel #2 (achieving the higher Mo capacity) showed a good performance; the 99mTc elution yield was 82.7 ± 2.0%, pH of the eluate ranged from 5 to 6.8, and 99Mo breakthrough in the eluted 99mTc was 0.005 ± 0.002% with a radiochemical purity of 97.3 ± 0.9% (as 99mTcO4−).