Synthetic crystalline calcium silicate hydrate (1): Cation exchange and caesium selectivity

被引：11

作者：

El-Korashy, SA ^{[1
]}

机构：

[1] Suez Canal Univ, Fac Sci, Dept Chem, Ismailia, Egypt

来源：

MONATSHEFTE FUR CHEMIE | 2002年 / 133卷 / 03期

关键词：

calcium silicate hydrate (I); transition metals; mechanism of exchange reaction; caesium selectivity;

D O I：

10.1007/s007060200012

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Solid crystalline calcium silicate hydrate (1) synthesized from equimolar amounts of Ca and Si under hydrothermal conditions at 120degreesC shows cation exchange properties towards divalent metal cations such as Ni, Cu, Cd, or Hg. It also exhibits caesium selectivity in the presence of Na+. The exchange capacity and selectivity of the solid can be increased by 10 and 28%, respectively, upon substitution of 0.01 mol of the Ca2+ in its structure by Na+. The ability of metal cation uptake by the solid was found to obey the order Ni2+ > Hg2+ > Cu2+ > Cd2+. The different affinities of calcium silicate hydrate (1) towards these ions can be used for their separation from solutions and also in nuclear waste treatment. The mechanism of the exchange reaction is discussed.

引用

页码：333 / 343

页数：11

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