Enhancement of ZnO-Based Photocatalyst Activity by RF Discharge-Plasma Treatment*
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The structure and photocatalytic properties of polydisperse zinc oxide (ZnO) powder treated with a low-pressure radio-frequency (RF) plasma discharge were studied. The photocatalytic properties of ZnO before and after the treatment were studied with respect to photodegradation of organic impurities using decomposition of methyl orange in aqueous solution by UV light as an example. It was found that the photodegradation kinetics were described well by first-order equations. The photodegradation mechanisms of methyl orange over untreated and plasma-treated ZnO samples were different. It was shown that the effectiveness of the photodegradation expressed in terms of reaction constants increased by 20% after RF discharge-plasma treatment of the photocatalyst.
Keywords
RF plasma treatment ZnO photocatalysisPreview
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