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Electrodeposition of Composite Coatings as a Method for Immobilizing TiO2 Photocatalyst

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Part of the book series: Environmental Chemistry for a Sustainable World ((ECSW,volume 29))

Abstract

In order to immobilize the TiO2 photocatalyst particles, various kinds of supports can be used. One of these involves the electrodeposition of metal matrices with entrapped titania particles. This work focuses on the electrodeposition and characterization of two new types of photocatalytic composite coatings. The first part of the chapter deals with the electrodeposition of Fe/TiO2 composite coatings using environmentally friendly aqueous methanesulfonate iron plating baths containing colloidal TiO2 particles. The effects of bath composition and electrolysis conditions on the content of titania particles in coatings were investigated; the surface morphology, microstructure, and microhardness of coatings were characterized. The photocatalytic performance of Fe/TiO2 electrodeposited coatings was evaluated in the reactions of decomposition of methyl orange and methylene blue dyes in water under the action of ultraviolet radiation. Although iron electrodeposited matrix is cheap, nontoxic, and easily repairable support for TiO2 photocatalysts, it is not corrosion-resistant enough. Therefore, special attention is needed to improve the corrosion resistance of photocatalytic Fe/TiO2 composite coatings via the electrodeposition of a protective ceria layer on their surface. The second part of this chapter is devoted to the electrodeposition of photocatalytic Ni/TiO2 composite coatings from colloidal electrolyte based on deep eutectic solvents which are now considered as promising analogues of room temperature ionic liquids. The fabrication of Ni/TiO2 composites from choline chloride based plating bath is reported. The Ni/TiO2 composite coatings manifest a photocatalytic activity toward the reaction of photochemical degradation of methylene blue organic dye in water solution.

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Protsenko, V.S., Kityk, A.A., Vasil’eva, E.A., Tsurkan, A.V., Danilov, F.I. (2019). Electrodeposition of Composite Coatings as a Method for Immobilizing TiO2 Photocatalyst. In: Inamuddin, Sharma, G., Kumar, A., Lichtfouse, E., Asiri, A. (eds) Nanophotocatalysis and Environmental Applications . Environmental Chemistry for a Sustainable World, vol 29. Springer, Cham. https://doi.org/10.1007/978-3-030-10609-6_10

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