Kinetics of chromate adsorption on goethite in the presence of sorbed silicic acid

Journal of Environmental Quality
Stephanie M GarmanMatthew J Eick

Abstract

The adsorption of chromate on mineral surfaces has received much attention due to its toxicity in natural systems. Spectroscopic studies have demonstrated that chromate forms inner-sphere complexes on variable-charge surfaces. However, in natural systems chromate has been observed to be fairly mobile, which has been explained by the presence of naturally occurring ligands competing with chromate for mineral surface sites. Silicic acid is a ubiquitous ligand in soil and water environments and also sorbs strongly to variable-charge surfaces. Yet little research has examined its influence on chromate adsorption to variable-charge surfaces such as goethite. This study examined the influence of silicic acid (0.10 and 1.0 mM) on the adsorption kinetics of chromate (0.05 and 0.10 mM) on goethite over a range of common soil pH values (4, 6, and 8). The rate and total quantity of chromate adsorption decreased in all the experiments except at a pH value of 4 and a chromate concentration of 0.05 mM. The inhibition of chromate adsorption ranged from 3.1% (pH = 4, Si = 0.10 mM, chromate = 0.10 mM) to 83.3% (pH = 8, Si = 1.0 mM, chromate = 0.05 mM). The rate of chromate adsorption decreased with an increase in pH and silicic acid concentrati...Continue Reading

Citations

Nov 11, 2014·Applied Geochemistry : Journal of the International Association of Geochemistry and Cosmochemistry·Xiaodong GaoJon Chorover
Aug 30, 2008·Environmental Technology·C Noubactep
Feb 23, 2008·Chemosphere·Jun JiangAnzhen Zhao
Feb 20, 2007·Journal of Colloid and Interface Science·Tjisse HiemstraWillem H van Riemsdijk
Feb 20, 2021·Environmental Science & Technology·Sara Goberna-FerrónAlejandro Fernández-Martínez

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