Removal of cobalt from aqueous solution by magnetic multiwalled carbon nanotube/iron oxide composites / Qi Wang in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011)  

Public ISBD [article]  inChemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.126–133 Titre : Removal of cobalt from aqueous solution by magnetic multiwalled carbon nanotube/iron oxide composites Type de document : texte imprimé Auteurs : Qi Wang, Auteur ; Jiaxing Li, Auteur ; Changlun Chen, Auteur Année de publication : 2012 Article en page(s) : pp.126–133 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Co(II) Magnetic MWCNT/IO composites Humic substances Removal Résumé : The effects of contact time, pH, ionic strength, foreign ions, temperature, humic substances (HSs), and the addition sequences of Co(II)/HSs on Co(II) sorption on magneticmultiwalled carbon nanotube/iron oxide composites (magnetic MWCNT/IO composites) were investigated under ambient conditions. The results indicated that Co(II) sorption on the magnetic MWCNT/IO composites increased with increasing pH. The ionic strength and foreign ion dependent of Co(II) sorption suggested that ion exchange and outer-sphere surface complexation were the main sorption mechanism at low pH, whereas the ionic strength and foreign ion independent of Co(II) sorption at high pH values indicated that inner-sphere surface complexation was predominant sorption mechanism. The Langmuir model fitted Co(II) sorption isotherms better than the Freundlich model. The thermodynamic data calculated from the temperature dependent sorption isotherms suggested that Co(II) sorption on the magnetic MWCNT/IO composites was a spontaneous and endothermic process. The removal of Co(II) by the magnetic MWCNT/IO composites was affected evidently by the presence of HSs and by the addition sequences of Co(II)/HSs. This study highlights the interactions between Co(II) and HSs to determine the mutual effects of inorganic and organic matters on the removal of metal ions in environmental pollution management. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010175 [article] Removal of cobalt from aqueous solution by magnetic multiwalled carbon nanotube/iron oxide composites [texte imprimé] / Qi Wang, Auteur ; Jiaxing Li, Auteur ; Changlun Chen, Auteur . - 2012 . - pp.126–133. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.126–133 Mots-clés : Co(II) Magnetic MWCNT/IO composites Humic substances Removal Résumé : The effects of contact time, pH, ionic strength, foreign ions, temperature, humic substances (HSs), and the addition sequences of Co(II)/HSs on Co(II) sorption on magneticmultiwalled carbon nanotube/iron oxide composites (magnetic MWCNT/IO composites) were investigated under ambient conditions. The results indicated that Co(II) sorption on the magnetic MWCNT/IO composites increased with increasing pH. The ionic strength and foreign ion dependent of Co(II) sorption suggested that ion exchange and outer-sphere surface complexation were the main sorption mechanism at low pH, whereas the ionic strength and foreign ion independent of Co(II) sorption at high pH values indicated that inner-sphere surface complexation was predominant sorption mechanism. The Langmuir model fitted Co(II) sorption isotherms better than the Freundlich model. The thermodynamic data calculated from the temperature dependent sorption isotherms suggested that Co(II) sorption on the magnetic MWCNT/IO composites was a spontaneous and endothermic process. The removal of Co(II) by the magnetic MWCNT/IO composites was affected evidently by the presence of HSs and by the addition sequences of Co(II)/HSs. This study highlights the interactions between Co(II) and HSs to determine the mutual effects of inorganic and organic matters on the removal of metal ions in environmental pollution management. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010175

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