Synthetic crystalline calcium silicate hydrate (I): cation exchange and caesium selectivity
Creators
- 1. Chemistry Department, Faculty of Science, Suez Canal University, Ismailia (Egypt)
Description
Solid crystalline calcium silicate hydrate (I) synthesized from equimolar amounts of Ca and Si under hydrothermal conditions at 120 oC 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 (I) 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. (author)
Additional details
Publishing Information
- Journal Title
- Monatshefte fuer Chemie
- Journal Volume
- 133
- Series
- Issue 3
- Journal Page Range
- p. 333-343
- ISSN
- 0026-9247
- CODEN
- MOCHAP
INIS
- Country of Publication
- Austria
- Country of Input or Organization
- Austria
- INIS RN
- 34032540
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Descriptors DEI
- CADMIUM IONS; CALCIUM IONS; CALCIUM SILICATES; CATIONS; CESIUM IONS; CHEMICAL REACTION KINETICS; COPPER IONS; HYDRATES; INORGANIC ION EXCHANGERS; ION EXCHANGE; MERCURY IONS; NICKEL IONS; RADIOACTIVE WASTE PROCESSING; SODIUM IONS; SOLVENT EXTRACTION
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; CHARGED PARTICLES; EXTRACTION; ION EXCHANGE MATERIALS; IONS; KINETICS; MANAGEMENT; MATERIALS; OXYGEN COMPOUNDS; PROCESSING; RADIOACTIVE WASTE MANAGEMENT; REACTION KINETICS; SEPARATION PROCESSES; SILICATES; SILICON COMPOUNDS; WASTE MANAGEMENT; WASTE PROCESSING