Abstract
Autoxidation of benzaldehyde (BA) in aqueous solutions of nonionic surfactants has been investigated. Oxidation process was followed by GC while the determination of the site of BA within micelles was made by UV spectroscopy and solubility measurement. It was found that the autoxidation of BA in aqueous solution was inhibited more strongly by nonionic surfactants, and that the site of BA within micelles was a deep penetration into the palisade layer.From the fact that dissolved oxygen participates the oxidation of BA, rates of oxygen absorption were examined in paraffin and in aqueous poly (ethylene) glycol solutions as micelle-core and micellepalisade model substances, respectively. Amounts of oxygen absorbed were less in aqueous poly (ethylene) glycol solutions than in water or paraffin.Based on the experimental results, it could be ascertained that the inhibition of BA oxidation in aqueous solutions of nonionic surfactants was caused by the inhibiting actions against oxygen absorption of the palisade layer of the micelle.
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