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Mechanisms Responsible for Adsorption of Molybdate ions on Alumina for the Production of Medical Radioisotopes

  • Fujita Yoshitaka
    Department of JMTR, Japan Atomic Energy Agency Graduate School of Engineering, Nagaoka University of Technology
  • Niizeki Tomotake
    Art Kagaku Co., Ltd.
  • Fukumitsu Nobuyoshi
    Department of Radiation Oncology, Kobe Proton Center
  • Ariga Katsuhiko
    JST-ERATO Yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitectonics (MANA), National Institute for Material Science Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo
  • Yamauchi Yusuke
    JST-ERATO Yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitectonics (MANA), National Institute for Material Science School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland
  • Malgras Victor
    JST-ERATO Yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitectonics (MANA), National Institute for Material Science
  • Kaneti Yusuf Valentino
    School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland
  • Liu Chia-Hung
    Department of Urology, School of Medicine, College of Medicine, and TMU Research Center of Urology and Kidney, Taipei Medical University Department of Urology, Shuang Ho Hospital, Taipei Medical University
  • Hatano Kentaro
    Faculty of Medicine, University of Tsukuba
  • Suematsu Hisayuki
    Graduate School of Engineering, Nagaoka University of Technology
  • Suzuki Tatsuya
    Graduate School of Engineering, Nagaoka University of Technology
  • Tsuchiya Kunihiko
    Department of JMTR, Japan Atomic Energy Agency

Abstract

<p>In this work, the mechanisms responsible for the adsorption of molybdate ions on alumina are investigated using in-depth surface analyses of alumina specimens immersed in solutions containing different molybdate ions at different pH values. The obtained results reveal that when alumina is immersed in an acidic solution containing molybdate ions, the hydroxyl groups present on the surface are removed to generate positively charged sites, and molybdate ions (MoO42− or AlMo6O24H63−) are adsorbed via an electrostatic interaction. Alumina dissolves slightly in an acidic solution to form AlMo6O24H63−, which is more easily desorbed than MoO42−. Furthermore, the enhancement in the Mo adsorption or desorption property may be achieved by enriching the surface of the alumina adsorbent with many –OH groups and optimizing Mo solution to adsorb molybdate ions on alumina as MoO42− ions. These findings will assist researchers in engineering more efficient and stable alumina-based adsorbents for molybdenum adsorption used in medical radioisotope (99Mo/99mTc) generators.</p>

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