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

Chirangano Mangwandi*, Ahmad B. Albadarin, Yoann Glocheux, Gavin M. Walker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)
663 Downloads (Pure)

Abstract

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.
Original languageEnglish
Pages (from-to)1123-1130
Number of pages8
JournalJournal of Environmental Chemical Engineering
Volume2
Issue number2
Early online date18 Apr 2014
DOIs
Publication statusPublished - Jun 2014

Keywords

  • Phosphate nutrient
  • Phosphate adsorption
  • Dolomite
  • waste water treatment

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