摘要:

This paper discusses some recent research work into the sorption of cations both hydrolysable and those that are not, on to a hydrous tin oxide and a silica-tin ion exchanger. The ions studied are mostly those that might be encountered in a radioactive waste streams; such as the non-hydrolysable ions Sr++and Cs+, hydrolysable species such as Co++and Eu3+and complexes such as Ru(NO)3+. Complete isotherm data have been generated for some of the ions considered. These can be correlated by a ‘Langmuir’ isotherm for quite a wide range of solution pH. From this data the oxide capacity for the ion can be determined, uptake of soluble cationic species always increases with solution pH. However for most metallic cations the exchangers are able to adsorb anionic species by the complex formation at low solution pH. Elution of the ions with acid and a complexing agent such as EDTA is also considered. Finally ‘synergistic effects’, when mixtures of cations are contacted with the exchangers are considered.

ISSN:0736-6299    

DOI:10.1080/07366299608918365

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The important characteristics of the cation exchange equilibrium of Na+/H+, namely, the experimental isotherm of Na+, selectivity coefficient, KNa/H;and thermodynamic equilibrium constant, KT,Na/H;have been determined for a 65% crosslinked, porous, strongly acidic cation exchanger, XP-051-RE. The experimental isotherm of Na in a binary system of Na+/H+exchange was determined using the tracer-pulse technique. A concave-upward isotherm was observed for the exchanger, that is Na+is less preferred than H+. The selectivity coefficient, KNa/H;varies with the concentration of Na+

ISSN:0736-6299    

DOI:10.1080/07366299608918366

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor