Experimental study on water desorption behavior of Li4SiO4 ceramic pebbles
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摘要: 采用程序升温热解吸（TPD/TDS）方法对Li4SiO4陶瓷小球的水解吸行为进行了实验研究。结果表明：水解吸过程中主要存在四个解吸峰；其中100 ℃附近的峰可解释为物理吸附水；150，250，400 ℃附近的峰可分别解释为以氢键、Li－OH和Si－OH配位键形式存在的化学吸附水。氚的释放与水的解吸几乎同步进行，且氚的释放形式主要为氚水（HTO），据此推测，氚水可能存在三种释放机制：（1）－OT+H2O－OH+HTO；（2）－OH+－OHH2O，－OT+H2O－OH+HTO；（3）－OT+－OHHTO。
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关键词:
- Li4SiO4陶瓷小球 /
- 水解吸 /
- 物理吸附 /
- 化学吸附 /
- 氚释放
Abstract: Water desorption behavior of Li4SiO4 ceramic pebbles was studied using temperature programmed desorption (TPD/TDS) method. The experiment results showed that water desorption was mainly followed by four peaks. The peak around 100 ℃ can be attributed to physisorbed water, the peak around 150 ℃ to water chemisorbed on surface oxygen ions through hydrogen bonds, and the peaks around 250 ℃ and 400 ℃ to chemisorbed water in hydroxylated form such as Li－OH and Si－OH. According to the fact that the processes of tritium release and water desorption proceeded almost simultaneously and the release form of tritium was mainly tritiated water (HTO), three mechanisms of tritium release as HTO form were proposed: (1) －OT+H2O－OH+HTO; (2) －OH+－OHH2O, －OT+H2O－OH+HTO; (3) －OT+－OHHTO.-
Key words:
- Li4SiO4 ceramic pebbles /
- water desorption /
- physisorption /
- chemisorption /
- tritium release
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