Unveiling enhanced photocatalytic behavior: Plasma electrolytic oxidation for TiO2/Bi2WO6 heterojunction coatings to enhance the photocatalytic degradation of methylene blue under visible light

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-04-01 DOI:10.1016/j.ceramint.2024.12.542

Razieh Chaharmahali, Arash Fattah-alhosseini, Minoo Karbasi

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引用次数: 0

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.

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揭示增强的光催化行为：等离子体电解氧化TiO2/Bi2WO6异质结涂层，增强可见光下亚甲基蓝的光催化降解

粉末光催化剂在可见光催化中的应用可能会受到纳米颗粒堆积和回收相关挑战的阻碍。因此，光催化涂层成为降解污染物的有希望的选择。在本研究中，通过等离子体电解氧化（PEO）工艺在钛（Ti）基上制备了TiO2/Bi2WO6涂层，随后采用水热处理。相分析结果表明，涂层由锐钛矿相、金红石相、Bi2WO6相和Bi6Ti3WO18相组成。后处理的应用可以在涂层表面诱导出针状结构。这有助于拓宽对可见光的光响应，并抑制通过光激发产生的电子-空穴对的复合。在可见光驱动和水热后处理PEO涂层的促进下，亚甲基蓝的光催化降解率可达75%。提出的光催化机制是基于从莫特-肖特基分析、陶克图和清除实验中获得的见解。结果表明，这种简单、环保、经济、可靠的方法有望成为水处理领域一种可行的涂层技术。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

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.