Title

The Impact of pH and Ion Exchange on 133Cs Adsorption on Vermiculite

Department

Ecology, Evolution, and Organismal Biology

Document Type

Article

Publication Date

7-26-2018

Abstract

Many studies have shown that the adsorption of ions like K+ and Cs+ on 2:1 clay minerals can prompt the collapse of their interlayers and render the adsorbing ions nonexchangeable. This study sought to better understand this unique adsorption mechanism through the generation of an adsorption envelope for 133Cs adsorption on vermiculite and the exploration of the kinetics of interlayer collapse. The collapse of the vermiculite interlayer was confirmed via X-ray diffraction (XRD), and the timing of interlayer collapse was determined by placing Cs+ in competition with K+ at different time intervals. The adsorption envelope for Cs+ on vermiculite showed that although H+ competition does affect the adsorption of Cs+ on vermiculite, the effect of this competition is quite limited, even at very low pH values. This hypothesis is supported by the fact that XRD demonstrated a significant decrease in interlayer dimension after Cs+ adsorption. Finally, kinetics experiments showed that the irreversible adsorption of K+ and the collapse of the interlayer may take place on a much longer time scale than previously considered.

Journal

Journal of Environmental Quality

Journal ISSN

0047-2425

Issue

6

First Page

1365

Last Page

1370

Digital Object Identifier (DOI)

10.2134/jeq2018.01.0043

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