AI Article Synopsis
- Low crystalline iron hydroxides, goethite and akaganeite, were synthesized to selectively adsorb phosphate ions from phosphate-rich seawater.
- Goethite and akaganeite exhibited different selectivity patterns for oxoanions, with both showing a strong preference for phosphate even in the complex seawater environment.
- The maximum phosphate uptake was determined to be 10 mg P/g at a concentration of 0.3 mg P/L, and akaganeite demonstrated excellent stability across multiple adsorption/desorption cycles.
Article Abstract
Low crystalline iron hydroxides such as goethite (alpha-FeOOH) and akaganeite (beta-FeOOH) were synthesized, and the selective adsorption of phosphate ions from phosphate-enriched seawater was examined. The results of the distribution coefficients (K(d)) of oxoanions in mixed anion solutions at pH 8 follow the selectivity order Cl-, NO3-, SO4(2-) << CO3(2-), HPO4(2-) for goethite, and Cl-, CO3(2-) < NO3- < SO4(2) << HPO4(2-) for akaganeite. In seawater, both adsorbents show high selectivity for phosphate ions despite the presence of large amounts of major cations and anions in seawater. The adsorption isotherms fitted better with the Freundlich equation and the maximum uptake of phosphate from phosphate-enriched seawater was 10 mg P/g at an equilibrium phosphate concentration of 0.3 mg P/L on both adsorbents. The phosphate adsorption/desorption cycles show that akaganeite is an excellent adsorbent even after 10 cycles and its chemical stability is good.
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| http://dx.doi.org/10.1016/j.jcis.2005.12.054 | DOI Listing |
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