Cation exchange applications of synthetic tobermorite for the immobilization and solidification of cesium and strontium in cement matrix
Cation exchange applications of synthetic tobermorite for the immobilization and solidification of cesium and strontium in cement matrix
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DOI：
10.1007/bf02903893
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发表时间：
2000
影响因子：
1.8
通讯作者：
O. Shrivastava;R. Shrivastava
中科院分区：
文献类型：
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作者：
O. Shrivastava;R. Shrivastava
在处理核电站放射性废物时，需要对Cs 137和Sr90等有害阳离子进行固定和固化。人们正在努力寻找一种安全处理核废料的万无一失的方法。在这方面，几位工作人员尝试了各种材料，如硼硅酸盐玻璃、沸石、水泥和合成岩石。本通讯涉及合成，表征，铯的吸收能力和浸出行为的合成氧化铝取代羟基硅酸钙水合物，这是接近获得的天然矿物，11-tobermorite。在Na+、K+、Mg+、Ca ~（2+）、Ba ~（2+）和Sr ~（2+）的500 - 1000倍浓溶液中，合成矿物对Cs ~+具有阳离子选择性。尽管在废物处理中常用的普通波特兰水泥（OPC）中仅含有可忽略不计的Cs+和Sr 2+，但将氧化铝取代的雪硅钙石添加到OPC中，通过显著降低阳离子的浸出速率来增强水泥基质的保留能力
Immobilization and solidification of hazardous cations like Cs137and Sr90are required while handling the radioactive waste of nuclear power plants. Efforts are on to find a fail proof method of safe disposal of nuclear wastes. In this context, various materials like borosilicate glass, zeolites, cements and synthetic rocks have been tried by several workers. This communication deals with the synthesis, characterization, cesium uptake capacity and leaching behaviour of synthetic alumina-substituted calcium silicate hydroxy hydrate, which are close to that obtained for the natural mineral,11Å tobermorite. The synthetic mineral show cation selectivity for Cs+in presence of500–1000times concentrated solutions of Na+, K+, Mg+, Ca2+, Ba2+and Sr2+. Although the ordinary portland cement (OPC) which is often used in waste management operations alone holds negligible amounts of Cs+and Sr2+, the addition of alumina-substituted tobermorite to OPC enhances the retention power of cement matrix by drastically lowering the leach rate of cations