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Uptake of bromate ion on amorphous aluminum hydroxide / Ramesh Chitrakar in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8726–8732 Titre : Uptake of bromate ion on amorphous aluminum hydroxide Type de document : texte imprimé Auteurs : Ramesh Chitrakar, Auteur ; Keisuke Mizobuchi, Auteur ; Akinari Sonoda, Auteur Année de publication : 2010 Article en page(s) : pp. 8726–8732 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Uptake  aqueous  solutions  Hydroxide Résumé : Batch experiments were performed to examine the BrO3− uptake from dilute aqueous solutions on amorphous aluminum hydroxide (Cl− type), which was synthesized by addition of a 3 mol/dm3 NaOH solution to a 0.1 mol/dm3 AlCl3 solution until the pH reached 5.8. The uptake from a 0.78 μmol/dm3 BrO3− solution (100 μg of BrO3/dm3) was rapid: equilibrium was attained within 3 min. The BrO3− uptake was found to decrease slowly at pH 4−8 and rapidly at pH >8. The isotherm for BrO3− uptake was well fitted with the Freundlich isotherm model. From distribution coefficient (Kd) values determined from mixed solutions containing 0.10, 1.0, and 2.0 mmol/dm3 NaCl, NaBrO3, NaNO3, Na2SO4, and Na2CO3, the selectivity order was reported as NO3− < BrO3− < SO42− at a pH range 4.8−7.9. These results suggest that the BrO3− uptake on the amorphous aluminum hydroxide occurs through an outer-sphere complex reaction. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901705n [article] Uptake of bromate ion on amorphous aluminum hydroxide [texte imprimé] / Ramesh Chitrakar, Auteur ; Keisuke Mizobuchi, Auteur ; Akinari Sonoda, Auteur . - 2010 . - pp. 8726–8732. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8726–8732 Mots-clés : Uptake  aqueous  solutions  Hydroxide Résumé : Batch experiments were performed to examine the BrO3− uptake from dilute aqueous solutions on amorphous aluminum hydroxide (Cl− type), which was synthesized by addition of a 3 mol/dm3 NaOH solution to a 0.1 mol/dm3 AlCl3 solution until the pH reached 5.8. The uptake from a 0.78 μmol/dm3 BrO3− solution (100 μg of BrO3/dm3) was rapid: equilibrium was attained within 3 min. The BrO3− uptake was found to decrease slowly at pH 4−8 and rapidly at pH >8. The isotherm for BrO3− uptake was well fitted with the Freundlich isotherm model. From distribution coefficient (Kd) values determined from mixed solutions containing 0.10, 1.0, and 2.0 mmol/dm3 NaCl, NaBrO3, NaNO3, Na2SO4, and Na2CO3, the selectivity order was reported as NO3− < BrO3− < SO42− at a pH range 4.8−7.9. These results suggest that the BrO3− uptake on the amorphous aluminum hydroxide occurs through an outer-sphere complex reaction. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901705n