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Title: Proton interaction in phosphate adsorption onto goethite
Authors: Zhong, B.
Stanforth, R. 
Wu, S.
Chen, J.P. 
Keywords: Adsorption
Bidentate complex
Monodentate complex
OH- release stoichiometry
Issue Date: 1-Apr-2007
Citation: Zhong, B., Stanforth, R., Wu, S., Chen, J.P. (2007-04-01). Proton interaction in phosphate adsorption onto goethite. Journal of Colloid and Interface Science 308 (1) : 40-48. ScholarBank@NUS Repository.
Abstract: 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. © 2007 Elsevier Inc. All rights reserved.
Source Title: Journal of Colloid and Interface Science
ISSN: 00219797
DOI: 10.1016/j.jcis.2006.12.055
Appears in Collections:Staff Publications

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