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Reaction mechanisms in swelling clays under ionizing radiation: influence of the water amount and of the nature of the clay mineral

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Abstract

We have studied the H2 production under ionizing radiation of water confined in synthetic saponite and montmorillonite as a function of the relative humidity. The H2 radiolytic yields in the dry systems are very similar to that measured in a non-swelling clay mineral. They are 2–3 times higher with one water layer in the interlayer space, evidencing very efficient energy transfers and efficient recombination reactions due to a high confinement. With two water layers, the H2 yields decrease as compared to the previous case, but remain higher than in bulk water, proving that recombination reactions of hydrogen atoms are less efficient. Electron paramagnetic resonance measurements evidence that reactivity changes significantly with the number of water layers. Saponite and montmorillonite give similar results, showing that reactivity is driven by the amount of water and that the details of the clay structure play a less important role. Lastly, the behavior of natural vs. synthetic swelling clays is discussed. The presence of impurities, even in small quantities, significantly alters energy transfers and has a positive implication for the geological nuclear waste management.

Graphical abstract: Reaction mechanisms in swelling clays under ionizing radiation: influence of the water amount and of the nature of the clay mineral

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Supplementary files

Article information


Submitted
07 Oct 2016
Accepted
28 Nov 2016
First published
03 Jan 2017

This article is Open Access

RSC Adv., 2017,7, 526-534
Article type
Paper

Reaction mechanisms in swelling clays under ionizing radiation: influence of the water amount and of the nature of the clay mineral

M. Lainé, E. Balan, T. Allard, E. Paineau, P. Jeunesse, M. Mostafavi, J.-L. Robert and S. Le Caër, RSC Adv., 2017, 7, 526
DOI: 10.1039/C6RA24861F

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