| Titre : | Selective uptake by akaganeite (B - FeOOH) of phosphite from hypophosphite and phosphite solutions (2012) |
| Auteurs : | Ramesh Chitrakar, Auteur ; Yoji Makita, Auteur ; Takahiro Hirotsu, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 51 N° 2, Janvier 2012) |
| Article en page(s) : | pp. 972-977 |
| Note générale : | Chimie industrielle |
| Langues : | Anglais |
| Tags : | Uptake |
| Résumé : | The anion-exchange properties of akaganeite (β-FeOOH) with phosphite (H2PO3― and HPO32― ) are reported herein. Uptake of phosphite by akaganeite followed the Freundlich isotherm model with exchange capacity of 1.0 mmol/g, and high distribution coefficients in multianion solution of 2.0 mmol/dm3 concentration (7.0 x 103 cm3/g at pH 3.9). Akaganeite displayed nearly constant uptake of phosphite (0.9 mmol/g) at pH 2.5―6.0. The kinetics on uptake of phosphite rapidly reached an equilibrium in 4 h. Akaganeite was also found to be feasible for high uptake of phosphite (1.2 mmol/g) and low uptake of hypophosphite (<0.10 mmol/g) at pH 6.3 from a highly concentrated binary solution containing 0.70 mol/dm3 phosphite, and 0.20 mol/dm3 hypophosphite. Akaganeite can be regenerated and reused for uptake of phosphite with an exchange capacity equivalent to that of the original akaganeite. |
| DEWEY : | 660 |
| ISSN : | 0888-5885 |
| En ligne : | http://cat.inist.fr/?aModele=afficheN&cpsidt=25476430 |
