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TiO 2 -SiO 2 -MgO catalyst was prepared and the OH radicals formed on the catalyst contacted with water were studied by the spin-trapping method. The condition of the catalyst surface that can produce OH radicals is optimized. The initial concentration of OH radicals on the surface does not influence the rate of the photocatalytic decomposition of hydrogen peroxide.
The surface of WO 3 -ZrO 2 prepared by a co-precipitation has been characterized by ESR. Three kinds of O 2- radicals having different g 1 values (S I : g = 2.028, S II : g = 2.026, and S III : g = 2.015) were formed on the surface of WO 3 -ZrO 2 by introduction of O 2 at room temperature. The ESR signals...
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