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How photocatalytic activity of the MAO-grown TiO_2 nano/micro-porous films is influenced by growth parameters?

机译:MAO生长的TiO_2纳米/微孔薄膜的光催化活性如何受到生长参数的影响?

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摘要

Pure titania porous layers consisted of anatase and rutile phases, chemically and structurally suitable for catalytic applications, were grown via micro-arc oxidation (MAO). The effect of applied voltage, process time, and electrolyte concentration on surface structure, chemical composition, and especially photocatalytic activity of the layers was investigated. SEM and AFM studies revealed that pore size and surface roughness of the layers increased with the applied voltage, and the electrolyte concentration. Moreover, the photocatalytic performance of the layers synthesized at medium applied voltages was significantly higher than that of the layers produced at other voltages. About 90% of methylene blue solution was decomposed after 180 min UV-irradiation on the layers produced in an electrolyte with a concentration of 10 g l~(-1) at the applied voltage of 450 V.
机译:通过微弧氧化(MAO)生长化学和结构适合催化应用的由锐钛矿相和金红石相组成的纯二氧化钛多孔层。研究了施加电压,处理时间和电解质浓度对层的表面结构,化学组成,尤其是光催化活性的影响。 SEM和AFM研究表明,层的孔径和表面粗糙度随施加电压和电解质浓度的增加而增加。而且,在中等施加电压下合成的层的光催化性能明显高于在其他电压下产生的层的光催化性能。紫外线照射180分钟后,在450 V的施加电压下,在浓度为10 g l〜(-1)的电解质中产生的层上分解约90%的亚甲基蓝溶液。

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  • 来源
    《Applied Surface Science》 |2010年第13期|p.4253-4259|共7页
  • 作者单位

    School of Metallurgy and Materials Engineering, Iran University of Science and Technology, P.O. Box 16845-161, Tehran, Iran Center of Excellence for Advanced Materials, Iran University of Science and Technology, P.O. Box 16845-195, Tehran, Iran;

    School of Metallurgy and Materials Engineering, Iran University of Science and Technology, P.O. Box 16845-161, Tehran, Iran Center of Excellence for Advanced Materials, Iran University of Science and Technology, P.O. Box 16845-195, Tehran, Iran;

    Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran Institute for Nanoscience and Nanotechnology, Sharif University of Technology, P.O. Box 14588-89694, Tehran, Iran;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    oxide materials; titanium dioxide; photocatalysis; micro-arc oxidation;

    机译:氧化物材料;二氧化钛;光催化;微弧氧化;

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