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Updated: Jul 17, 2026

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method

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Published on: May 18, 2018

Proton interaction in phosphate adsorption onto goethite.

Bin Zhong¹, Robert Stanforth, Shunnian Wu

¹Division of Environmental Science & Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576.

Journal of Colloid and Interface Science

|January 27, 2007

Summary

Phosphate adsorption on goethite involves complex surface interactions. This study reveals that phosphate binding transitions from monodentate to bidentate complexation as coverage increases, impacting hydroxyl release.

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Published on: July 14, 2015

Area of Science:

Environmental Science
Geochemistry
Surface Chemistry

Background:

Phosphate adsorption on iron oxides like goethite is crucial for nutrient cycling and contaminant sequestration.
Current models often simplify phosphate binding as a basic ligand exchange with surface hydroxyl groups.

Purpose of the Study:

To investigate the detailed binding mechanisms of phosphate on goethite.
To evaluate the role of proton interactions and surface charge changes during phosphate adsorption.
To understand how binding forms evolve with increasing phosphate coverage.

Main Methods:

Analysis of proton interaction during adsorption.
Monitoring of surface charge variations.
Evaluation of hydroxyl release stoichiometry at different phosphate loadings.

Main Results:

Hydroxyl release stoichiometry increases with phosphate coverage, indicating evolving adsorption mechanisms.
Phosphate surface binding shifts from monodentate to bidentate complexation as surface coverage increases.
The observed net hydroxyl release is consistent with a 2pK(a) multisite binding model.

Conclusions:

Phosphate adsorption on goethite is a dynamic process, not a single ligand exchange mechanism.
The transition from monodentate to bidentate binding is a key factor influencing surface charge and proton exchange.
A 2pK(a) multisite model provides a more accurate interpretation of phosphate-goethite interactions across varying coverages.