Adsorption of Cationic and Anionic Dyes onto Commercial Kaolin

Commercial kaolin from a Polish deposit has been examined as a low-cost adsorbent for effluent remediation using five cationic and five anionic industrial dyes. Methylene Blue dye was also used as a reference. The anionic dyes studied showed no affinity towards the kaolin surface, whereas the experi...

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Bibliographic Details
Published inAdsorption science & technology Vol. 27; no. 2; pp. 205 - 214
Main Authors Ziólkowska, D., Shyichuk, A., Karwasz, I., Witkowska, M.
Format Journal Article
LanguageEnglish
Published London, England SAGE Publications 01.03.2009
Subjects
Adsorption
Cationic
Cationic dyes
Dyes
Effluents
Kaolin
Mathematical analysis
Surface chemistry
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Summary:Commercial kaolin from a Polish deposit has been examined as a low-cost adsorbent for effluent remediation using five cationic and five anionic industrial dyes. Methylene Blue dye was also used as a reference. The anionic dyes studied showed no affinity towards the kaolin surface, whereas the experimental isotherms for the adsorption of the cationic dyes could all be well described by the Langmuir equation. The values of the adsorption capacity of kaolin towards the cationic dyes ranged from 4 mg/g to 29 mg/g, being probably dependent on the geometry of the dye molecules. The resulting degrees of decolourization attained values of 85–90% for initial dye concentrations in the range 6–20 mg/dm3 and for kaolin loadings of 0.5–3 g/dm3. Adsorption of the cationic dyes onto kaolin increased at higher solution pH values.
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ISSN:0263-6174
2048-4038
DOI:10.1260/026361709789625306