摘要
选用钛酸异丙酯和正硅酸乙酯作为原材料，采用溶胶．凝胶水热方法合成了除铯用高钛硅比分子筛孔道结构化合物Na4Ti4Si3O10（NaTS）。研究了硅钛比、钠钛比、反应时间和反应温度等不同合成条件对NaTS除铯性能的影响，并利用付立叶变换红外光谱对样品的分子筛骨架原子基团进行了表征。孔分析测试表明，NaTS的孔径尺寸主要分布于15—30nm，BET比表面积为1．811×10^2m^2/g，孔容0．265cm^3／g，平均孔径8．700nm。离子交换实验结果表明，NaTS对Cs离子在酸性介质中具有很好的选择性。在0．1mol／LHNO3、0．1g／LCs的水溶液中，对Cs的分配系数达3．65×10^4mL／g。
A novel silicotitanium molecular sieve Na4Ti4Si3O10 （ NaTS ） for cesium removal with high Ti/Si was synthesized successfully by sol-gel hydrothermal method using TIPT as the titanium raw material. The effects of Ti/Si, NaOH/Ti, temperature, reaction time on the cesium removal ability were discussed systematically. Also the framework structure of NaTS products was characterized by FI-IR and porous analysis. Experimental results show that the pore size of the sample ranges from 15 to 30 nm, the specific surface area is 1.811×10^2 m^2/g and average pore size is 8.700 nm. Ion exchange tests show that NaTS has a high selectivity for cesium in acidic solution. When in 0.1 mol/L HNO3 and 0.1 g/L Cs＋ solution, the distribution coefficient Kd is as high as 36 500 g/mL, which may be used as a promising cesium exchanger in acidic HLLW.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第A02期116-119,共4页
Rare Metal Materials and Engineering
基金
教育部"跨世纪优秀人才培养计划基金"资助项目
关键词
除铯
孔道化合物
水热合成
晶化
cesium removal
open-framework
hydrothermal synthesis
silicotitanate
