Removal of ortho-phosphate from aqueous solution by adsorption onto dolomite

Mangwandi, Chirangano; Albadarin, Ahmad B.; Glocheux, Yoann; Waler, Gavin M.

Walker_2014_Removal.pdf (1.12 MB)

Removal of ortho-phosphate from aqueous solution by adsorption onto dolomite

journal contribution

posted on 2018-10-25, 11:07 authored by Chirangano Mangwandi, Ahmad B. Albadarin, Yoann Glocheux, Gavin M. Waler

An experimental study on the adsorption of phosphate onto cost effective fine dolomite powder is presented. The effect of solution pH, solution ionic strength and adsorption isotherm were examined. The adsorption of phosphate was pH dependent and phosphate adsorption favoured acidic conditions. The adsorption was significantly influenced by solution ionic strength indicating outer-sphere complexation reactions. The experimental data further indicated that the removal of phosphate increased with increase in the ionic strength of solution. The experimental data were modelled with different isotherms: Langmuir, Freundlich and Redlich–Peterson isotherms. It was found that the Redlich–Peterson isotherm depicted the equilibrium data most accurately. The overall kinetic data fitted very well the pseudo-first-order rate model.

History

Publication

Journal of Environmental Engineering;2 (2), pp. 1123-1130

Publisher

Elsevier

Note

peer-reviewed

Rights

This is the author’s version of a work that was accepted for publication in Journal of Environmenal Chemical Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Environmental Chemical Engineering, 2014, 2 (2), pp. 1123-1130, https://doi.org/10.1016/j.jece.2014.04.010