The radiation-induced oxidation of ethanol and methanol by hydrogen peroxide in aqueous solution

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Abstract
The radiation-induced chain oxidation of ethanol and methanol by hydrogen peroxide in deaerated aqueous solutions has been investigated. In each case the alcohol is oxidized to the corresponding aldehyde and hydrogen peroxide is reduced in equivalent yield. With ethanol as the oxidizable substrate the yields are independent of peroxide concentration in the range 5 × 10−2 to 5 × 10−3 M and linearly dependent on ethanol concentration in the range 0.085 to 0.85 M. In contrast, the oxidation of methanol is first order in hydrogen peroxide, independent of methanol concentration up to 2.0 M and shows a simple square root dependence on dose rate. The differences are explained by consideration of the participation of two different radicals derived from ethanol, CH3ĊHOH and ĊH2CH2OH, whereas only one radical, ĊH2OH, is formed from methanol.

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