亚临界水热法固化处理含碘敷银硅胶

摘要/Abstract

摘要： 利用亚临界水热条件下产生的羟基自由基可以加速反应进程,以NaAlO₂为原料处理自制的含碘敷银硅胶,加入质量分数5%的FD61玻璃粉作为添加剂形成了碘方钠石,对比了静态亚临界水热条件和动态亚临界水热条件下合成的碘方钠石固化体的物相、微观结构与形貌的差异。XRD结果表明动态亚临界水热条件下有利于形成碘方钠石;SEM-EDS结果表明,动态亚临界水热合成的碘方钠石形貌为规整的圆片状,粒径约为2 μm,碘元素在固化体内分布均匀;TG-DSC结果表明动态亚临界合成固化体热稳定性较好,超过850 ℃以上会发生分解;XPS结果表明碘方钠石中碘元素是以I^-存在的。可为亚临界水热条件低温快速处理含碘敷银硅胶提供了一定的理论参考。

关键词: 碘方钠石, 亚临界水热法, 含碘敷银硅胶, 陶瓷固化

Abstract: This study utilizes the fact that hydroxyl radicals generated under subcritical hydrothermal conditions can accelerate the reaction process. The iodosodalite was formed by treating homemade iodine-containing silver-containing silica gel with NaAlO₂ as raw material and adding 5 wt.% FD61 glass powder as an additive. The differences under static subcritical hydrothermal conditions and dynamic subcritical hydrothermal conditions were compared in the physical phase, microstructure and morphology of the iodosilicate synthesized. The XRD results showed that the dynamic subcritical hydrothermal conditions were favourable for the formation of iodosodalite due to the full contact between the solid phase and the liquid phase by the constant stirring. The SEM-EDS results show that the iodosodalite synthesized under the dynamic subcritical hydrothermal perform a homogeneous morphology with regular round flakes and the particle size about 2 μm. In the dynamic subcritical hydrothermal conditions, the iodine element is uniformly distributed in the solidification. The TG-DSC result shows that the synthesized solidified body has a good thermal stability, and can only decompose above 850 ℃. The XPS result shows that the elemental iodine in iodosodalite exists in the form of I^-. The present work could provide some theoretical references for low-temperature and rapid treatment of iodine-containing silver-coated silica gel under subcritical hydrothermal conditions.

Key words: iodosodalite, subcritical hydrothermal condition, silver-coated silica gel containing iodine, ceramic solidification

中图分类号:

TL941+.11

张玉钏, 冯亚鑫, 刘刈, 张赛, 王志鹏, 杨开迪, 郭鹏, 李宜宁, 张生栋, 张振涛. 亚临界水热法固化处理含碘敷银硅胶[J]. 辐射防护, 2024, 44(S1): 90-96.

ZHANG Yuchuan, FENG Yaxin, LIU Yi, ZHANG Sai, WANG Zhipeng, YANG Kaidi, GUO Peng, LI Yining, ZHANG Shengdong, ZHANG Zhentao. Treatment of silver-coated silica gel containing iodine waste by subcritical hydrothermal condition[J]. RADIATION PROTECTION, 2024, 44(S1): 90-96.

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