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首页> 外文期刊>Environmental Science & Technology >Photocatalytic degradation of gaseous organic species on photonic band-gap titania
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Photocatalytic degradation of gaseous organic species on photonic band-gap titania

机译：光子带隙二氧化钛对气态有机物的光催化降解

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The use of photonic band gap (PBG) titania ( inverse opal) for the photocatalytic degradation of an organic chemical in air is demonstrated in this study using 1,2-dichlorobenzene. A photonic band gap in the mid-to-high ultraviolet (UV) wavelength range (280-380 nm), normally associated with the optimal photocatalytic activity of anatase titania, is expected to increase the quantum efficiency for the catalyst. To achieve this band gap, porous structures with alternating air and titania spaces with a periodicity of about 150 nm is required. A thin film of porous photonic titania was synthesized in-situ on a quartz glass rod with a sol-gel technique using polystyrene micro-spheres as templates. Scanning electron microscopy images revealed a pore size of about 100 nm and a periodicity of similar to 150 nm, necessary for the desired band gap. X-ray diffraction studies of the coating showed the presence of anatase titania, which is known to exhibit photoactivity. The photocatalytic activity of the coated titania film was verified by measuring the degradation of 1,2-dichlorobenzene vapor in a semi-batch mode in the presence of UV radiation (mid-high UV wavelength) PBG titania showed 248% higher photonic efficiency compared to commercially available P25 titania catalyst. Transmission spectra from the thin films showed high absorbance in the UV range, suggesting a band gap in the region of UV illumination.
机译：在这项使用1,2-二氯苯的研究中，证明了使用光子带隙（PBG）二氧化钛（反蛋白石）对空气中的有机化学物质进行光催化降解。通常与锐钛矿型二氧化钛的最佳光催化活性相关的中至高紫外（UV）波长范围（280-380 nm）的光子带隙有望提高催化剂的量子效率。为了达到该带隙，需要具有周期性交替的约150nm的空气和二氧化钛空间的多孔结构。以聚苯乙烯微球为模板，利用溶胶凝胶技术在石英玻璃棒上原位合成了多孔光子二氧化钛薄膜。扫描电子显微镜图像显示所需的带隙所必需的孔径约为100 nm，周期性约为150 nm。涂层的X射线衍射研究表明存在锐钛矿型二氧化钛，已知其表现出光活性。通过在紫外辐射（中高紫外波长）存在下以半间歇模式测量1,2-二氯苯蒸气的降解，可以验证涂覆的二氧化钛薄膜的光催化活性。与之相比，PBG二氧化钛的光子效率高出248％市售的P25二氧化钛催化剂。薄膜的透射光谱在UV范围内显示出高吸收率，表明在UV照明区域中存在带隙。

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