Proton interaction in phosphate adsorption onto goethite

Bin Zhong, Robert Stanforth, Shunnian Wu, J. Paul Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


The adsorption of phosphate on goethite is generally modeled by assuming a simple ligand exchange reaction with surface hydroxyl groups. This study investigates the binding forms of phosphate on goethite by evaluating the proton interaction and surface charge change during phosphate adsorption. It is found that OH- release stoichiometry increases with phosphate coverage, which suggests that different mechanisms predominate at different phosphate loadings. It demonstrates that surface binding changes from monodentate complexation to bidentate complexation with increasing surface phosphate coverage. The net OH- release accompanying this transformation is best interpreted with a 2 p Ka multisite model.

Original languageEnglish
Pages (from-to)40-48
Number of pages9
JournalJournal of Colloid and Interface Science
Issue number1
StatePublished - 1 Apr 2007
Externally publishedYes


  • Adsorption
  • Bidentate complex
  • Goethite
  • Monodentate complex
  • OH release stoichiometry
  • Phosphate

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