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<p>Iodine-131 (<sup>131</sup>I), a widely used radionuclide for thyroid cancer therapy, can present in a liquid waste that poses significant environmental risks if not properly managed. This study aims to develop carbon/silver (C/Ag) nanocomposites optimized for the adsorption and immobilization of <sup>131</sup>I in urine waste from post-thyroid cancer therapy patients. The carbon precursor was derived from palm kernel shells (PKS), and chemically modified using gamma irradiation to enhance its properties. The C/Ag nanocomposites were synthesized via the incipient wetness impregnation method to improve their affinity for <sup>131</sup>I. Characterizations were conducted using FESEM-EDS, XRD, FTIR, TGA, DSC, and N<sub>2</sub>-sorption analyses to confirm the structural and surface properties of the material. Adsorption tests revealed a maximum adsorption uptake (Cµ<sub>max</sub>) of 1543&#xa0;MBq/g at pH 3 for the C/Ag-treated irradiation nanocomposite in <sup>131</sup>I solutions which was well fitted with the Langmuir adsorption model. The adsorption kinetics were well described by a pseudo-second order (PSO) model, with a rate constant of 3.56 × 10<sup>−4</sup>&#xa0;MBq/g.min<sup>−1</sup>, demonstrating a rapid adsorption performance. Under simulated urine waste conditions, the nanocomposite exhibited an excellent stability with a Cµ<sub>max</sub> of 1212&#xa0;MBq/g at pH 5.5, also following the Langmuir model. The adsorption kinetics under these conditions were similarly described by the PSO model, with a rate constant of 2.84 × 10<sup>−4</sup>&#xa0;MBq/g.min<sup>−1</sup>. Therefore, the C/Ag nanocomposites are promising materials for the efficient management of <sup>131</sup>I waste in nuclear medicine facilities.</p>

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Development of C/Ag nanocomposites for adsorption and immobilization of iodine-131 (131I) from the urine of thyroid ablation therapy patients

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Chaidir Pratama,
  • Marlina,
  • Miftakul Munir,
  • Herlan Setiawan,
  • Indra Saptiama,
  • Anas Fahmi Imron,
  • N. J. W. Ekaningsih,
  • Fani Triyatna,
  • M. C. Prihatiningsih,
  • Rohadi Awaludin,
  • Teguh Ariyanto,
  • Imam Prasetyo

摘要

Iodine-131 (131I), a widely used radionuclide for thyroid cancer therapy, can present in a liquid waste that poses significant environmental risks if not properly managed. This study aims to develop carbon/silver (C/Ag) nanocomposites optimized for the adsorption and immobilization of 131I in urine waste from post-thyroid cancer therapy patients. The carbon precursor was derived from palm kernel shells (PKS), and chemically modified using gamma irradiation to enhance its properties. The C/Ag nanocomposites were synthesized via the incipient wetness impregnation method to improve their affinity for 131I. Characterizations were conducted using FESEM-EDS, XRD, FTIR, TGA, DSC, and N2-sorption analyses to confirm the structural and surface properties of the material. Adsorption tests revealed a maximum adsorption uptake (Cµmax) of 1543 MBq/g at pH 3 for the C/Ag-treated irradiation nanocomposite in 131I solutions which was well fitted with the Langmuir adsorption model. The adsorption kinetics were well described by a pseudo-second order (PSO) model, with a rate constant of 3.56 × 10−4 MBq/g.min−1, demonstrating a rapid adsorption performance. Under simulated urine waste conditions, the nanocomposite exhibited an excellent stability with a Cµmax of 1212 MBq/g at pH 5.5, also following the Langmuir model. The adsorption kinetics under these conditions were similarly described by the PSO model, with a rate constant of 2.84 × 10−4 MBq/g.min−1. Therefore, the C/Ag nanocomposites are promising materials for the efficient management of 131I waste in nuclear medicine facilities.