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Surface complexation of antimony on kaolinite
Sudipta Rakshit1, Dibyendu Sarkar2, Rupali Datta3
1Department of Agricultural and Environmental Sciences, Tennessee State University, 3500 John A. Merritt Blvd., Nashville, TN 37209-1561, USA.
Chemosphere
|July 22, 2014
Summary
Antimony adsorption on kaolinite clay is influenced by pH and competing phosphate ions, but not ionic strength. Surface complexation modeling refined understanding of antimony
Area of Science:
- Environmental Geochemistry
- Clay Mineralogy
- Environmental Chemistry
Background:
- The environmental behavior of antimony (Sb), an oxyanion similar to arsenic (As), is poorly understood.
- Kaolinite, a common clay mineral, significantly influences contaminant fate through adsorption in soils and aquifers.
Purpose of the Study:
- To investigate antimony adsorption onto kaolinite under varying solution conditions.
- To elucidate the mechanisms of antimony adsorption using surface complexation modeling (SCM).
Main Methods:
- Adsorption experiments were conducted varying initial antimony concentration, pH, ionic strength, and competing anions.
- Surface complexation modeling, using a multicomponent additive approach assuming kaolinite as a quartz-gibbsite mixture, was applied.
Main Results:
- Ionic strength had a negligible impact on antimony adsorption.
- Phosphate significantly competed with antimony for adsorption sites on kaolinite.
- SCM models, particularly one with binuclear complexes on quartz and mononuclear on gibbsite, accurately predicted antimony adsorption across different conditions.
Conclusions:
- Antimony adsorption on kaolinite is a complex process dependent on pH and the presence of competing anions like phosphate.
- SCM provides valuable mechanistic insights into antimony-kaolinite interactions.
- Understanding these interactions is crucial for predicting antimony's environmental fate.
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