Unveiling enhanced photocatalytic behavior: Plasma electrolytic oxidation for TiO2/Bi2WO6 heterojunction coatings to enhance the photocatalytic degradation of methylene blue under visible light
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Abstract
The use of powder photocatalysts in visible light catalysis can be hindered by the build-up of nanoparticles and the challenges associated with their recovery. As a result, photocatalytic coatings emerge as promising options for the degradation of pollutants. In this research, a coating of TiO2/Bi2WO6 was developed on a titanium (Ti) base through the process of plasma electrolytic oxidation (PEO), with a hydrothermal treatment employed as a subsequent step. The results from the phase analysis indicate that the coatings consisted of anatase, rutile, Bi2WO6, and Bi6Ti3WO18 phases. The application of a post treatment can induce a needle-like structure on the surface of the coating. This contributes to broadening the light response to visible light and suppressing the recombination of generated electron-hole pairs through photoexcitation. The photocatalytic degradation of methylene blue, driven by visible light and facilitated by the hydrothermal post treatment PEO coating, can reach up to 75 %. The proposed photocatalytic mechanism is based on insights gained from the Mott–Schottky analysis, Tauc plot, and scavenging experiments. The outcomes indicate that this straightforward, eco-friendly, cost-effective, and sturdy procedure holds promise as a viable coating technique in the realm of water treatment.
期刊介绍：
Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties.
Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour.
Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.
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