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Development of a doped titania immobilised thin film multi tubular photoreactor

机译:掺杂二氧化钛固定化薄膜多管光反应器的研制

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摘要

This paper describes a novel doped titania immobilised thin film multi tubular photoreactor which has been developed for use with liquid, vapour or gas phase media. In designing photocatalytic reactors measuring active surface area of photocatalyst within the unit is one of the critical design parameters. This dictate greatly limits the applicability of any semi-conductor photocatalyst in industrial applications, as a large surface area equates to a powder catalyst. This demonstration of a thin film coating, doped with a rare earth element, novel photoreactor design produces a photocatalytic degradation of a model pollutant (methyl orange) which displayed a comparable degradation achieved with P25 TiO2. The use of lanthanide doping is reported here in the titania sol gel as it is thought to increase the electron hole separation therefore widening the potential useful wavelengths within the electromagnetic spectrum. Increasing doping from 0.5% to 1.0% increased photocatalytic degradation by ∼17% under visible irradiation. A linear relationship has been seen between increasing reactor volume and degradation which would not normally be observed in a typical suspended reactor system.
机译:本文介绍了一种新型的掺杂二氧化钛固定化薄膜多管光反应器,该反应器已开发用于液相,气相或气相介质。在设计光催化反应器时,测量单元内光催化剂的活性表面积是关键的设计参数之一。由于较大的表面积相当于粉末催化剂,因此这极大地限制了任何半导体光催化剂在工业应用中的适用性。新颖的光反应器设计证明了掺有稀土元素的薄膜涂层的产生,可对模型污染物(甲基橙)进行光催化降解,显示出与P25 TiO2相当的降解效果。据报道,在二氧化钛溶胶凝胶中使用了镧系元素掺杂,因为据认为这会增加电子空穴的分离,从而扩大了电磁光谱内潜在的有用波长。在可见光照射下,掺杂从0.5%增加到1.0%可使光催化降解增加约17%。在增加的反应器体积和降解之间已经发现线性关系,这在典型的悬浮反应器系统中通常不会观察到。

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