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首页> 外文期刊>RSC Advances >Visible light responsive TiO2 photocatalysts for degradation of indoor acetaldehyde
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Visible light responsive TiO2 photocatalysts for degradation of indoor acetaldehyde

机译：可见光响应TiO2光催化剂用于室内乙醛的降解

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Photocatalysis is a promising technique for developing sustainable and environmentally friendly materials to improve indoor air quality. Visible-light-responsive TiO _(2) has been widely investigated but there are inconsistent results because photocatalytic properties depend strongly on synthetic methods. Herein, we synthesize TiO _(2) doped with 10 different metal ions (M–TiO _(2) ) by conducting a dialysis in a sol–gel method to obtain the best photocatalyst for the degradation of acetaldehyde under LED irradiation. Purification of a sol by dialysis enables us to discuss pure effects of dopants on the photocatalytic activity because impurities such as counter ions of metal salts are removed before sintering. Only Cr–, Pt–, V–, and Fe–TiO _(2) show photocatalytic activity and the optimal doping amounts are 0.50–1.7, 0.10, 1.0, and 0.10 atom%, respectively. Such differences in the optimal amounts can be explained in terms of the dopant ions having different valence states, suggesting the formation of oxygen vacancies. The Cr–TiO _(2) powder exhibits high activity even at the doping amount of 4.2 atom%. We also demonstrate that the Cr–TiO _(2) film prepared on a glass substrate can be used to degrade acetaldehyde by changing the film thickness and the LED intensity depending on the degree of the indoor contamination.
机译：光催化是一种开发可持续和环保材料的有希望的技术，以提高室内空气质量。可见光响应TiO _（2）已被广泛研究，但结果不一致，因为光催化性能强烈依赖于合成方法。这里，通过在溶胶 - 凝胶法中通过透析透析来合成掺杂10种不同的金属离子（M-TiO _（2）），以获得LED照射下乙醛降解乙醛的最佳光催化剂。通过透析纯化溶胶使我们能够讨论掺杂剂对光催化活性的纯作用，因为在烧结之前除去金属盐的抗衡离子等杂质。只有Cr-，Pt-，V-和Fe-TiO _（2）显示光催化活性，最佳掺杂量分别为0.50-1.7,0.7,0.10,10和0.10原子％。在具有不同价态的掺杂剂离子方面可以解释最佳量的这种差异，表明氧空位的形成。 Cr-TiO _（2）粉末甚至以4.2原子％的掺杂量显示出高活性。我们还表明，在玻璃基板上制备的Cr-TiO _（2）膜可根据室内污染程度改变膜厚度和LED强度来降解乙醛。

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