Selective caesium transport using hollow fibre-supported liquid membrane containing calix[4]arene-bis-naphthocrown-6 as the carrier extractant
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Pankaj Kandwal
Abstract
Polypropylene hollow fibre-based supported liquid membrane (HFSLM) containing calix[4]-bis-2,3-naphtho-crown-6 in 20% (v/v) n-dodecane+80% (v/v) 2-nitrophenyl octyl ether (NPOE) as the carrier solvent was employed for the first time to investigate the transport behaviour of radio-caesium. The carrier solution was 1 mM calix[4]-bis-2,3-naphtho-crown-6 in 20% (v/v) dodecane+80% (v/v) NPOE+0.4% alamine 336 and the feed was 3 M HNO3 while distilled water was used as the receiver phase. In spite of high viscosity of the carrier solvent, quantitative (>99%) transport was possible in about 6 h. Significant amount of acid transport was also noticed which was ascribed to a co-transport mechanism involving encapsulated hydronium ion. Selectivity studies were carried out by taking a mixture of radiotracers, viz.51Cr, 59Fe, 85,89Sr, 137Cs, 152,154Eu and 241Am, which represent some of the elements present in the high level waste, in the feed solution. The decontamination factors for various metal ions were found to be in the range 540–890. High decontamination factors as well as possibility of working over several days without deterioration of the liquid membrane suggested possible application of the system for the recovery of radio-caesium from high level waste. Studies on the membrane stability indicated reproducible transport data over 40 h.
© by Oldenbourg Wissenschaftsverlag, Mumbai, Germany
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Articles in the same Issue
- Excitation functions of nuclear reactions leading to the soft-radiation emitting radionuclides 45Ca, 49V and 204Tl in beam collimator materials used in proton therapy
- Unusual extraction of plutonium(IV) from uranium(VI) and americium(III) using phosphonate based task specific ionic liquid
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- Cesium sorption on studtite (UO2O2·4H2O)
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- Selective caesium transport using hollow fibre-supported liquid membrane containing calix[4]arene-bis-naphthocrown-6 as the carrier extractant
- Studies on production of high specific activity 99Mo and 90Y by Szilard Chalmers reaction
- Perfluorinated phenols as extraction agents for Cs+ and Sr2+
- Liquid–liquid extraction of Nd(III) and Eu(III) using nalidixic acid in dichloromethane
- Studies towards the development of lipophilic bifunctional N3S3 chelators for 68Ga
- Chemical characterization of tin-lead glazed ceramics from Aragon (Spain) by neutron activation analysis
- Analysis of municipal waste dump soil using a low power reactor: a study by instrumental neutron activation analysis
