%0 Journal Article
%T Nitrite ions sorption on strongly basic anion exchanger Purolite A-400 modified with Cr(III)-containing compounds
%A Vasile Gutsanu
%A Elena Tutovan
%A Ludmila Cotsofana
%A Vladimir Bulicanu
%J Ion Exchange Letters
%D 2012
%I Department of  Power Engineering, Institute of Chemical Technology
%X It is shown that in the same conditions the sorption of nitrite ions on strongly basic anion exchanger Purolite A-400 modified with Cr(III)-containing compounds, especially from solution with pH >4, is much higher as on Purolite A-400(Cl). Sorption on Purolite A-400 (Cl) essentially depends on solution pH and on Purolite A-400(Cr) almost does not depend on solution pH. Nitrite ions sorption isotherm on Purolite A-400 (Cl) may be described by Langmuir sorption model, but on Purolite A-400 (Cr) ¨C by the type III isotherms of the BET classification. The influence of NaNO2, KCl, K2SO4 concentration, pH, temperature and duration of Purolite A-400 (Cr) contacting with solution on NO2- removal has been studied using method of statistical mathematics. Optimizing of NO2- ions removal has been studied too. It is shown that NO2- ions removal from solution by Cr(III)-containing compounds polymer takes place through the three processes: ion exchange, NO2- coordinate with Cr3+ in the polymer phase and NO2- decomposition (in a low-acid medium). Modified with Cr(III)-containing compounds strongly basic anion exchanger becomes a selective sorbent for NO2- ions sorption.
%K ion exchange
%K nitrite ions sorption
%K method of statistical mathematics
%K Cr(III)-containing compounds
%K FT-IR spectroscopy
%U http://iel.vscht.cz/articles/1803-4039-05-0006.pdf