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

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  • Yoshitaka Fujita
    Department of JMTR, Japan Atomic Energy Agency, 4002 Narita, Oarai, Higashi-Ibaraki, Ibaraki 311-1393 , Japan
  • Tomotake Niizeki
    Art Kagaku Co., Ltd., 3135-20 Muramatsu, Tokai, Naka, Ibaraki 319-1112 , Japan
  • Nobuyoshi Fukumitsu
    Department of Radiation Oncology, Kobe Proton Center, 1-6-8 Minatojima Minamimachi, Chuo-ku, Kobe 650-0047 , Japan
  • Katsuhiko Ariga
    JST-ERATO Yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitectonics (MANA), National Institute for Material Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 , Japan
  • Yusuke Yamauchi
    JST-ERATO Yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitectonics (MANA), National Institute for Material Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 , Japan
  • Victor Malgras
    JST-ERATO Yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitectonics (MANA), National Institute for Material Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 , Japan
  • Yusuf Valentino Kaneti
    School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072 , Australia
  • Chia-Hung Liu
    Department of Urology, School of Medicine, College of Medicine, and TMU Research Center of Urology and Kidney, Taipei Medical University, No. 250, Wu-Hsing Street, Taipei 110 , Taiwan
  • Kentaro Hatano
    Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575 , Japan
  • Hisayuki Suematsu
    Graduate School of Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188 , Japan
  • Tatsuya Suzuki
    Graduate School of Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188 , Japan
  • Kunihiko Tsuchiya
    Department of JMTR, Japan Atomic Energy Agency, 4002 Narita, Oarai, Higashi-Ibaraki, Ibaraki 311-1393 , Japan

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<jats:title>Abstract</jats:title> <jats: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.</jats:p>

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