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首页> 外文期刊>Journal of nanomaterials >Development of Photocatalytic Active TiO2Surfaces by Thermal Spraying of Nanopowders
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Development of Photocatalytic Active TiO2Surfaces by Thermal Spraying of Nanopowders

机译：纳米粉体热喷涂技术开发光催化活性TiO2表面

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摘要

Titanium dioxide is a very useful photocatalyst for the decomposition and diminution of environmental water and air pollutants. In such applications, it can be used as slurry or as immobilized coating obtained by different deposition methods. The studies performed in the last years showed that thermal spraying could be employed to elaborate TiO2coatings with high performance for the decomposition of organic compounds. This manuscript presents a comparative study on the microstructure and photocatalytic performance of titania coatings obtained by different thermal spray techniques: atmospheric plasma spraying (APS), suspension plasma spraying (SPS) and high-velocity oxygen fuel spray process (HVOF). Different titania powders and suspensions were used to study the influence of the feedstock materials on the coating characteristics. The deposits were mainly characterised by SEM and X-ray diffraction. The photocatalytic performance was evaluated from the removal of nitrogen oxides.The experimental results showed that a drastic reduction of the pollutant concentration was obtained in presence of coatings elaborated by suspension plasma spraying. TiO2coatings resulting from the spraying of agglomerated powder presentd less efficiency. That was mainly explained by the significant phase transformation from anatase to rutile that occurred in the enthalpic source during the spray processes.
机译：二氧化钛是用于分解和减少环境水和空气污染物的非常有用的光催化剂。在这样的应用中，它可以用作浆料或通过不同沉积方法获得的固定涂层。近年来进行的研究表明，可以采用热喷涂工艺来制备具有高性能的TiO2涂层，以分解有机化合物。该手稿对通过不同的热喷涂技术获得的二氧化钛涂层的微观结构和光催化性能进行了比较研究：大气等离子喷涂（APS），悬浮等离子喷涂（SPS）和高速氧燃料喷涂工艺（HVOF）。使用不同的二氧化钛粉末和悬浮液来研究原料对涂层特性的影响。沉积物主要通过SEM和X射线衍射表征。通过去除氮氧化物来评估其光催化性能。实验结果表明，在通过悬浮等离子喷涂精制的涂层存在下，污染物浓度得到了大幅降低。喷涂附聚粉末产生的TiO2涂层效率较低。这主要是由于在喷涂过程中焓源中发生了从锐钛矿到金红石的明显相变。

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