Removal of60Co and134Cs radionuclides from aqueous solution using titanium tungstate ion exchanger

2010 ◽  
Vol 13 (1-3) ◽  
pp. 418-426 ◽  
Author(s):  
G. M. Ibrahim
Keyword(s):  
Aqueous Solution ◽  
Ion Exchanger ◽  
Tungstate Ion

Preparation of the 1-(2,5-anhydro-β-d-arabinofuranosyl) derivatives of cytosine and uracil and their cleavage with hydrogen bromide

1982 ◽  
Vol 47 (11) ◽  
pp. 2961-2968 ◽  
Author(s):  
Hubert Hřebabecký ◽  
Josef Brokeš ◽  
Jiří Beránek
Keyword(s):  
Aqueous Solution ◽  
Sodium Hydroxide ◽  
Hydrogen Bromide ◽  
Ion Exchanger ◽  
Alternative Synthesis ◽  
Derivatives Of ◽  
Uracil Derivative

Anhydronucleoside Ia was prepared from chloroarabinofuranosylcytosine IIIc or from 2,2'-anhydro-1-(5-chloro-5-deoxy-β-D-arabinofuranosyl)cytosine by the action of a strongly basic ion exchanger. The anhydro derivative IIa was prepared from 2,2'-anhydro-1-(5-chloro-5-deoxy-β-D-arabinofuranosyl)uracil by treatment with aqueous solution of sodium hydroxide. The action of hydrogen bromide in dimethylformamide on 2',5'-anhydronucleosides Ia and IIa leads both to the cleavage of the anhydro bond under formation of the 5'-bromo derivatives IIIa and IVa and to the cleavage of nucleosidic bond. In case of the uracil derivative IIa, the α-arabinofuranosyl derivative V was also isolated after preceding acetylation. For unambiguous proof of the structure, an alternative synthesis of compound V was performed.

scholarly journals Synthesis and investigation of properties of new chelate sorbent for water purification

2019 ◽  
Vol 63 (3) ◽  
pp. 298-303
Author(s):  
V. I. Grachek ◽  
A. P. Polikarpov ◽  
A. A. Shunkevich ◽  
R. V. Martsynkevich ◽  
O. I. Isakovich
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Vapor Phase ◽  
Water Purification ◽  
Cation Exchanger ◽  
Ion Exchanger ◽  
Ferrous Metals ◽  
Non Ferrous Metals ◽  
Effective Sorbent ◽  
Nitron Fiber

Polymer analogous transformations of a “nitron” fiber were established and a new amino carboxylic fibrous cation exchanger FIBAN X-2 was obtained. It is shown that FIBAN X-2 is an effective sorbent of heavy and non-ferrous metals from multi-ionic aqueous solutions, regardless of the method of fiber amination. The cation exchanger obtained by amination of a “nitron” fiber in the vapor phase absorbs Mn+2 twice as much as the ion exchanger obtained by amination in the aqueous solution.

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