Abstract
Hydrogen peroxide and molecular hydrogen are formed when γ-irradiated silica gel is suspended in acidified water. Oxygen adsorbed on the gel prior to irradiation or subsequently increases the yield of hydrogen peroxide. A further accumulation is observed in suspensions containing alcohol or formic acid. Adsorption of hydrogen decreases the peroxide yield both with and without subsequent adsorption of oxygen but has no influence on the yield if adsorbed in a mixture with oxygen. The results are discussed in terms of the reactions of electrons and holes trapped at the surface of silica gel in the course of irradiation.
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