Wire-like layered KNb3O8 particles in the shape of crystal rods with an average length of 10-20 microns and a width distribution in the range of 200-500 nm have been prepared and their treatment with nitric acid has been investigated. It has been found that the process of nitration leads to a partial substitution of potassium cation with a proton with formation of K3H3Nb10.8O30. The photocatalytic activity of KNb3O8 and K3H3Nb10.8O30 in the reaction of ethanol’s photooxidation in intermediate acetaldehyde and final products, such as water and CO2 has been studied. It has been demonstrated that activity of KNb3O8 is more than two times higher in the complete photooxidation of ethanol and more than four times higher in the reaction of formation of acetaldehyde as compared to K3H3Nb10.8O30. Enhanced photochemical activity of KNb3O8 has been discussed and explained by large distance between the layers of its particles and improved adsorption of ethanol.

Photochemical activity of layered potassium niobate in the redox processes

253rd National Meeting (2017)

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