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The spent fuel dissolution process produces high-temperature, high-humidity radioactive exhaust gases, containing substances like radioactive iodine and nitrogen oxides, which make the gases acidic. This increases the complexity of treatment and can corrode adsorbent materials, reducing their efficiency and lifespan. This study examines the effectiveness of hydrophobically modified, multistage pore silver-loaded zeolite in removing iodomethane (CH3I) under high-temperature and high-humidity conditions. ZSM-5 zeolite were first treated with hydrofluoric acid (HF) to create a multistage pore structure, significantly increasing their specific surface area and pore sites. Silver ions were then impregnated into the HF-treated ZSM-5 porous zeolite. To enhance performance in humid conditions, the silver-loaded sieves were hydrophobically modified with phenyltriethoxysilane, which reduced moisture interference and improved stability. The adsorption performance of these modified materials was evaluated for their ability to remove CH3I from simulated spent fuel dissolved exhaust gases. Results showed that HF treatment and silver loading increased the surface area and pore volume, enhancing their adsorption capacity. The hydrophobic modification further improved CH3I removal by increasing moisture resistance. These findings suggest that optimized, hydrophobically modified silver-loaded zeolites are promising candidates for filtering radioactive iodine-containing gases, offering a new approach for spent fuel dissolved exhaust gas treatment.

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Synthesis of Hierarchical Porous Zeolite as Efficient Adsorbents for Methyl Iodide Removal from Spent Fuel Dissolution Off-Gas

  • 会议论文

  • 发表日期：

    2026年

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  • Jinjie Sun,
  • Caishan Jiao,
  • Mengxun Liu,
  • Gang Zhang,
  • Wei Gong,
  • Jian Ding,
  • Chenxi Hou,
  • Yaorui Li,
  • Meng Zhang

摘要

The spent fuel dissolution process produces high-temperature, high-humidity radioactive exhaust gases, containing substances like radioactive iodine and nitrogen oxides, which make the gases acidic. This increases the complexity of treatment and can corrode adsorbent materials, reducing their efficiency and lifespan. This study examines the effectiveness of hydrophobically modified, multistage pore silver-loaded zeolite in removing iodomethane (CH3I) under high-temperature and high-humidity conditions. ZSM-5 zeolite were first treated with hydrofluoric acid (HF) to create a multistage pore structure, significantly increasing their specific surface area and pore sites. Silver ions were then impregnated into the HF-treated ZSM-5 porous zeolite. To enhance performance in humid conditions, the silver-loaded sieves were hydrophobically modified with phenyltriethoxysilane, which reduced moisture interference and improved stability. The adsorption performance of these modified materials was evaluated for their ability to remove CH3I from simulated spent fuel dissolved exhaust gases. Results showed that HF treatment and silver loading increased the surface area and pore volume, enhancing their adsorption capacity. The hydrophobic modification further improved CH3I removal by increasing moisture resistance. These findings suggest that optimized, hydrophobically modified silver-loaded zeolites are promising candidates for filtering radioactive iodine-containing gases, offering a new approach for spent fuel dissolved exhaust gas treatment.