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Kinetics of Chromate Adsorption on Goethite in the Presence of Sorbed Silicic Acid

Stephanie M. Garman, Todd P. Luxton and Matthew J. Eick*

Department of Crop and Soil Environmental Sciences, Virginia Tech, Blacksburg, VA 24061



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  		Fig. 1. Kinetics of chromate adsorption on goethite as a function of pH. Ionic strength (I) = 0.01 M and goethite suspension = 1.0 g L–1.

 


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  		Fig. 2. Kinetics of silicic acid adsorption on goethite as a function of pH. Ionic strength (I) = 0.01 M and goethite suspension = 1.0 g L–1.

 


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  		Fig. 3. Zeta potential of goethite in the presence and absence of sorbed silicic acid. Ionic strength (I) = 0.01 M and goethite suspension = 1.0 g L–1.

 


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  		Fig. 4. Kinetics of chromate (0.05 mM) adsorption on goethite in the presence and absence of sorbed silicic acid. (a) pH 4, (b) pH 6, (c) pH 8. Ionic strength (I) = 0.01 M and goethite suspension = 1.0 g L–1.

 


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  		Fig. 5. Kinetics of chromate (0.10 mM) adsorption on goethite in the presence and absence of sorbed silicic acid. (a) pH 4, (b) pH 6, (c) pH 8. Ionic strength (I) = 0.01 M and goethite suspension = 1.0 g L–1.

 




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