Cationic dye adsorption onto natural and synthetic zeolites in the presence of Cs+ and Sr^sup 2+^ ions

Adsorption of diazine dye safranine O (SO) in the presence of ... and ... ions was investigated onto natural and synthetic zeolites in order to predict competition of cationic organic species with their radionuclides, which are the main fission products released into the environment. Adsorption of S...

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Bibliographic Details
Published in:Toxicological and environmental chemistry 2015-01, Vol.97 (1), p.11
Main Authors: Ayar, Nihat, Keçeli, Gönül, Kurtoglu, Ayse Engin, Atun, Gülten
Format: Article
Language:English
Subjects:
Adsorption
Approximation
Bioremediation
Diffusion
Dyes
Ions
Nutrient removal
Radioactive materials
Zeolites
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Summary:Adsorption of diazine dye safranine O (SO) in the presence of ... and ... ions was investigated onto natural and synthetic zeolites in order to predict competition of cationic organic species with their radionuclides, which are the main fission products released into the environment. Adsorption of SO was measured up to the 40th day and the surface-diffusion coefficients (Ds) were estimated by applying Nernst-Planck approximation based on a homogeneous-surface-diffusion model. The values of Ds were 10 times higher on natural zeolite than those of synthesized zeolite from fly ash (FA) under hydrothermal conditions. Similarly, distribution coefficients (KD) were considerably higher on the clinoptilolite-type natural zeolite. The zeolitized product of FA is mainly composed of analcime and sodalite. SO adsorption on natural zeolite was not influenced by ... and ... ions, but it decreased at high concentrations on synthetic zeolite. The higher influence of the ... ions on SO+ adsorption showed that they compete with each other for the same adsorption sites. These results suggested that natural zeolite cannot be used for remediation of wastewater polluted with Cs and Sr radionuclides in the presence of organic cations, whilst FA zeolite has a potential for Sr removal. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0277-2248