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<p>This study investigates the adsorption of aqueous I<sub>2</sub> on epoxy-painted surfaces at 25&#xa0;°C, 55&#xa0;°C, and 85&#xa0;°C, to simulate conditions encountered during nuclear accidents. Adsorption kinetics follow the pseudo-second-order model, with rate constants ranging from (1.0 ± 0.1) × 10<sup>−5</sup> to (3.8 ± 0.2) × 10<sup>4</sup> m<sup>2</sup>·mg<sup>−1</sup>·min<sup>−1</sup>. Distribution coefficients increase with temperature and I<sub>2</sub> concentration, reaching 566.2 ± 56.6 L·m<sup>−2</sup> at 85&#xa0;°C. XPS confirms I<sub>2</sub> reduction to I<sup>−</sup> on the surface. The adsorption isotherm fits the Freundlich model, with a critical temperature between 25&#xa0;°C and 55&#xa0;°C. Below this temperature, adsorption dominates (n &gt; 1), while at higher temperatures, redox reactions become significant (n &lt; 1).</p>

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Study on the adsorption of elemental iodine onto painted surfaces in aqueous systems

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Jingyi Chen,
  • Danwen Qin,
  • Mingliang Kang,
  • Wanqin Tu,
  • Wujian Jin,
  • Jingye She,
  • Hanqin Weng,
  • Zeyue Huang,
  • Xuan Wu,
  • Hanyu Wu

摘要

This study investigates the adsorption of aqueous I2 on epoxy-painted surfaces at 25 °C, 55 °C, and 85 °C, to simulate conditions encountered during nuclear accidents. Adsorption kinetics follow the pseudo-second-order model, with rate constants ranging from (1.0 ± 0.1) × 10−5 to (3.8 ± 0.2) × 104 m2·mg−1·min−1. Distribution coefficients increase with temperature and I2 concentration, reaching 566.2 ± 56.6 L·m−2 at 85 °C. XPS confirms I2 reduction to I− on the surface. The adsorption isotherm fits the Freundlich model, with a critical temperature between 25 °C and 55 °C. Below this temperature, adsorption dominates (n > 1), while at higher temperatures, redox reactions become significant (n < 1).