Formation of hydroxyl radicals catalyzed by clay surfaces |
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| Authors: | D Gournis M A Karakassides D Petridis |
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| Institution: | (1) Department of Materials Science and Engineering, University of Ioannina, Ioannina, 451 10, Greece Tel.: +30-651-98517; Fax: +30-651-98690 E-mail: dgourni@cc.uoi.gr, GR;(2) Institute of Materials Science, NCSR DEMOKRITOS, Ag. Paraskevi Attikis, 153 10 Athens, Greece, GR |
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| Abstract: | The formation of superoxide and hydroxyl radicals at the surface of smectite clays due to oxygen reduction is demonstrated
by electron paramagnetic resonance spectroscopy. The yield of hydroxyl radicals is mainly a function of particle size of the
clays and depends, to a lesser extent, on the clay lattice iron. Synthetic laponite clay with small platelet size (∼20 nm)
and without lattice iron is leading in the formation of hydroxyl radicals followed by montmorillonite (∼200 nm). Fluorohectorite
(∼2000 nm) was inactive to hydroxyl radical formation by oxygen reduction.
Received: 20 January 2001 / Accepted: 7 August 2001 |
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| Keywords: | Smectite clays Hydroxyl radical Superoxide Spin trapping EPR |
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