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首页> 外文期刊>Clean technologies and environmental policy >Titania-reduced graphene oxide nanocomposite as a promising visible light-active photocatalyst for continuous degradation of VVOC in air purification process
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Titania-reduced graphene oxide nanocomposite as a promising visible light-active photocatalyst for continuous degradation of VVOC in air purification process

机译：二氧化钛还原的氧化石墨烯纳米复合材料作为有希望的可见光活性光催化剂，可在空气净化过程中连续降解VVOC

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Titania-reduced graphene oxide nanocomposites have been prepared through facile hydrothermal method by a reaction between P25 as TiO2 source and graphene oxide. Reduction of graphene oxide and its reaction with P25 nanoparticles were achieved simultaneously at high temperature and pressure during the hydrothermal process with the minimum organic solvents. Chemical bonds, crystalline structure, morphology, porosity and light absorption of composites along with their photocatalytic activity under UV and visible light irradiation were investigated. Transmission electron microscopy images showed that P25 nanoparticles, with diameters about 25 nm, were dispersed on the sheets of reduced graphene oxide (RGO) homogeneously. A stronger interaction between P25 and RGO provided a red shift about 20 nm in the absorption edge of the composites. To set up a continuous tubular reactor made from thin layer of the prepared material, composite films were coated on the external surface of a steel tube to make an annular reactor. The reactor was equipped with UV or visible light sources to investigate the photocatalytic activity of the prepared composites in a continuous air flow contaminated with specified amount of acetaldehyde as a VVOC (very volatile organic compound) model molecule. Degradation efficiency of P25-RGO with 0.5 wt% RGO was significantly high under visible light irradiation, and about 70% conversion was observed using an air flow at normal conditions with specific flow rate of 17 ml min(-1) and 500 ppm acetaldehyde, by 30 mg of the coated composite in the reactor. Composites with low amount of RGO would be an appropriate photosensitizer and electron acceptor to suppress the recombination of photogenerated electron-hole pairs to enhance the photocatalytic performance.
机译：通过P25作为TiO2源与氧化石墨烯的反应，通过水热法制备了二氧化钛还原的氧化石墨烯纳米复合材料。在水热过程中，使用最少的有机溶剂，可以在高温和高压下同时还原氧化石墨烯及其与P25纳米颗粒的反应。研究了复合材料的化学键，晶体结构，形貌，孔隙率和吸光度以及它们在紫外和可见光照射下的光催化活性。透射电子显微镜图像显示，直径约25 nm的P25纳米颗粒均匀地分散在还原氧化石墨烯（RGO）的薄片上。 P25和RGO之间的较强相互作用在复合材料的吸收边缘提供了约20 nm的红移。为了建立由所制备的材料的薄层制成的连续管式反应器，将复合膜涂覆在钢管的外表面上以制成环形反应器。该反应器配备有紫外线或可见光源，以研究所制备复合材料在连续气流中的光催化活性，该连续气流被指定量的乙醛作为VVOC（极易挥发有机化合物）模型分子污染。在可见光照射下，具有0.5 wt％RGO的P25-RGO的降解效率非常高，在正常条件下以17 ml min（-1）的比流速和500 ppm乙醛的气流在正常条件下观察到约25％的转化率，在反应器中加入30 mg的涂层复合材料。具有低RGO含量的复合材料将是合适的光敏剂和电子受体，以抑制光生电子-空穴对的复合，从而增强光催化性能。

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