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Removal capacity and adsorption mechanism of heat-treated palygorskite clay for methylene blue / Hao Chen in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.143–150 Titre : Removal capacity and adsorption mechanism of heat-treated palygorskite clay for methylene blue Type de document : texte imprimé Auteurs : Hao Chen, Auteur ; Jie Zhao, Auteur ; Aiguo Zhong, Auteur Année de publication : 2012 Article en page(s) : pp.143–150 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Adsorption  Heat-treated  palygorskite  Methylene  blue  Dissolved  ions  Mechanism Résumé : In this work, palygorskite clay was activated by heat treatment method and its capacity for the removal of a typical cationic dye, methylene blue, was studied. The activated samples were characterized by XRD and BET techniques. The physical quantities including the cation exchange capacity (CEC) of the activated samples, the variation of pH during the adsorption process and the concentration of metal ions in the supernatant were also measured. The results show that the adsorption capacity of the heat-treated sample increases with temperature and reaches the maximum at 700 °C, and then decreases with further increasing temperature. In general, with the increasing calcined temperature, the variation trend of the adsorption capacity of activated samples for dye is accordant with that of CEC. The results of the metal ions leached from the adsorbent demonstrate the leaching amount of divalent ions (Mg2+, Ca2+) in all samples are significantly higher than that of univalent (Na+, K+) and trivalent ions (Fe3+, Al3+). In addition, the changing tendency of leaching amount of divalent ions with the increasing temperature is consistent with that of adsorption capacity of the heat-treated samples whether the dye solution is acidic, neutral or alkaline. The leaching of divalent ions should be the main factor affecting the adsorption capacity of heat-activated palygorskite for methylene blue. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010205 [article] Removal capacity and adsorption mechanism of heat-treated palygorskite clay for methylene blue [texte imprimé] / Hao Chen, Auteur ; Jie Zhao, Auteur ; Aiguo Zhong, Auteur . - 2012 . - pp.143–150. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.143–150 Mots-clés : Adsorption  Heat-treated  palygorskite  Methylene  blue  Dissolved  ions  Mechanism Résumé : In this work, palygorskite clay was activated by heat treatment method and its capacity for the removal of a typical cationic dye, methylene blue, was studied. The activated samples were characterized by XRD and BET techniques. The physical quantities including the cation exchange capacity (CEC) of the activated samples, the variation of pH during the adsorption process and the concentration of metal ions in the supernatant were also measured. The results show that the adsorption capacity of the heat-treated sample increases with temperature and reaches the maximum at 700 °C, and then decreases with further increasing temperature. In general, with the increasing calcined temperature, the variation trend of the adsorption capacity of activated samples for dye is accordant with that of CEC. The results of the metal ions leached from the adsorbent demonstrate the leaching amount of divalent ions (Mg2+, Ca2+) in all samples are significantly higher than that of univalent (Na+, K+) and trivalent ions (Fe3+, Al3+). In addition, the changing tendency of leaching amount of divalent ions with the increasing temperature is consistent with that of adsorption capacity of the heat-treated samples whether the dye solution is acidic, neutral or alkaline. The leaching of divalent ions should be the main factor affecting the adsorption capacity of heat-activated palygorskite for methylene blue. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010205