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Evaluation of the photocatalytic activity of TiO_2-coatings prepared by different thermal spray techniques

机译：不同热喷涂技术制备的TiO_2涂层的光催化活性评价

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摘要

The metastable anatase structure of titanium dioxide (TiO_2) is photocatalytically active and thus able to purify air and water. This makes anatase TiO_2 a desirable material for instance in environmental technology. The present work provides a comparative study on the photocatalytic activity of TiO_2 coatings, prepared by different spray methods: conventional atmospheric plasma spraying, HVOF spraying, suspension spraying and cold spraying. The spray experiments were performed with anatase powder as feedstock and the spray parameters were optimized in order to obtain coatings with high photocatalytic performance. With respect to spray technique and spray conditions, different amounts of the photocatalytic active anatase phase could be retained. The photocatalytic activity of the coatings was evaluated by degradation of dichloroacetic acid. The results show that the photocatalytic activity is highly dependent on the amount of preserved anatase structure obtained under the different spray techniques.
机译：二氧化钛（TiO_2）的亚稳态锐钛矿结构具有光催化活性，因此能够净化空气和水。这使得锐钛矿TiO 2例如在环境技术中成为期望的材料。本工作提供了对通过不同喷涂方法制备的TiO_2涂层的光催化活性的比较研究：常规大气等离子体喷涂，HVOF喷涂，悬浮喷涂和冷喷涂。以锐钛矿粉为原料进行喷涂实验，优化喷涂参数，以获得具有高光催化性能的涂料。关于喷雾技术和喷雾条件，可以保留不同量的光催化活性锐钛矿相。通过二氯乙酸的降解来评估涂层的光催化活性。结果表明，光催化活性高度依赖于在不同喷雾技术下获得的保留的锐钛矿结构的量。

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