Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 298, Issue 2, Pages 602-608Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2005.12.054
Keywords
goethite; akaganeite; phosphate; seawater; adsorption
Categories
Ask authors/readers for more resources
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-, SO42- << CO32- HPO42- for geothite, and Cl-, CO32- < NO3- < SO42- << HPO42- 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. (c) 2006 Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available