Photocatalytic reactor based on UV-LED/TiO₂ coated quartz tube for degradation of dyes

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• 作者：Kalithasan Natarajan ; Thillai Sivakumar Natarajan ; H.C. Bajaj ; Rajesh J. Tayade  ; ;   ; ^{tayade@csmcri.org} ;   ; ^{rtayade@gmail.com}
• 关键词：UV-light emitting diode (UV-LED) ; Titanium dioxide ; Photocatalysis ; Malachite green ; Methylene blue ; Rhodamine B ; Electrical energy
• 刊名：Chemical Engineering Journal
• 出版年：2011
• 出版时间：15 December 2011
• 年：2011
• 卷：178
• 期：Complete
• 页码：40-49
• 全文大小：1216 K

文摘

A photocatalytic reactor using ultraviolet light emitting diode (UV-LED) source and TiO₂ coated quartz tube (TiO₂-QT) has been developed and successfully applied for the degradation of three different dyes such as malachite green (MG), methylene blue (MB), and rhodamine B (RhB).

The TiO₂ coated surface and solid catalyst were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N₂ adsorption¨Cdesorption measurements and UV¨Cvis diffuse reflectance spectroscopy techniques for their structural, textural and electronic properties. The kinetic studies for the photocatalytic degradation of dyes were carried out and further confirmed by high pressure liquid chromatography and chemical oxygen demand analysis. Electrical energy per order (E_Eo) for the photocatalytic degradation of dyes has been calculated. The operational parameters such as effect of flow rate, pH, and initial dye concentration has been studied for the degradation of MG dye to optimize the designed photocatalytic reactor. In addition to this, the degradation pathway for MG dye has been proposed based on the electro spray ionization-mass spectrometry analysis. The results demonstrated that the feasibility of utilization of developed reactor for the degradation of dyes.