Selective Uptake by Akaganeite (尾-FeOOH) of Phosphite from Hypophosphite and Phosphite Solutions
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- 作者：Ramesh Chitrakar ; Yoji Makita ; Takahiro Hirotsu ; Akinari Sonoda
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2012
- 出版时间：January 18, 2012
- 年：2012
- 卷：51
- 期：2
- 页码：972-977
- 全文大小：785K
- 年卷期：v.51,no.2(January 18, 2012)
- ISSN：1520-5045
文摘
The anion-exchange properties of akaganeite (尾-FeOOH) with phosphite (H2PO3鈥?/sup> and HPO32鈥?/sup>) 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 脳 103 cm3/g at pH 3.9). Akaganeite displayed nearly constant uptake of phosphite (0.9 mmol/g) at pH 2.5鈥?.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.