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首页> 外文期刊>Arabian Journal for Science and Engineering >Comparative Study on Photocatalytic Degradation of Methylene Blue by Degussa P25 Titania: Pulsed Laser Light Versus Continuous Broad Spectrum Lamp Irradiation
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Comparative Study on Photocatalytic Degradation of Methylene Blue by Degussa P25 Titania: Pulsed Laser Light Versus Continuous Broad Spectrum Lamp Irradiation

机译：Degussa P25二氧化钛对亚甲蓝光催化降解的比较研究：脉冲激光与连续光谱灯辐照

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摘要

While most technologists use lamp light for the evaluation of catalysts synthesized for photocatalytic processes, some researchers prefer laser light. To conform in judgement, a comparative study of photocatalytically degrading methylene blue is reported, using a model catalyst Degussa P25, under different energies of 355 nm pulsed laser and under lamp (visible light and broader lamp light) irradiations. The used amounts of Degussa P25 after each batch of experiments were characterized by X-ray diffractometry, BET surface area analysis, field emission scanning electron microscopy, energy dispersive X-ray spectrometry and diffuse reflectance spectroscopy. The spectral photocatalytic degradation efficiencies, between broad lamp light and UV pulsed laser light, were comparable. Larger and spherical nanoparticles formation and reduction of BET surface area were noticed under pulsed UV laser beam irradiation of Degussa P25, while such trends were not observed under lamp irradiation for similar incident light intensities. The carbon contents on the surface, even after calcination of used samples at C, and the red shift in absorption spectra, were recorded in Degussa P25 used samples for both pulsed UV laser and lamp photocatalysis. Moreover, no change in the phases of Degussa P25 resulted under either types of irradiations during photocatalysis evaluation.
机译：虽然大多数技术人员使用灯来评估用于光催化过程的合成催化剂，但一些研究人员更喜欢激光。为了作出判断，报道了使用模型催化剂Degussa P25在355 nm脉冲激光的不同能量下以及在灯（可见光和更宽的灯光）照射下光催化降解亚甲基蓝的比较研究。通过X射线衍射法，BET表面积分析，场发射扫描电子显微镜，能量色散X射线光谱法和漫反射光谱法表征每批实验后的Degussa P25的使用量。在宽灯和紫外脉冲激光之间的光谱光催化降解效率是可比的。在Degussa P25的脉冲UV激光束照射下，观察到较大的球形纳米颗粒形成和BET表面积减小，而对于相似的入射光强度，在灯照射下未观察到这种趋势。即使在C处使用过的样品煅烧后，表面的碳含量以及吸收光谱的红移都记录在用于脉冲UV激光和灯光催化的Degussa P25使用的样品中。此外，在光催化评估过程中，无论哪种照射方式，Degussa P25的相态都没有变化。

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