Materials Science Forum Vol. 855

Abstract: The photocatalytic oxidation of phenol on the composite copper oxide (II) modified titania photocatalyst (CuO/TiO₂) with sunlight irradiation at high oxygen pressure are studied. The photocatalyst characterized by Scanning electron microscopy (SEM), UV-Visible Diffuse Reflectance spectroscopy (UV-DRS), Surface area analysis, and X-ray diffractometry (XRD). The composite photocatalyst based on the anatase includes 3% copper oxide (II). The CuO/TiO₂ photocatalytic activity was investigated of phenol oxidation with sunlight irradiation at high oxygen pressure. The photocatalytic oxidation of phenol described Langmuir-Hinshelwood equation and calculated its parameters. With the increasing, the oxygen pressure the rate of phenol photocatalytic oxidation also increases. The quantum yield of the photocatalytic phenol oxidation at high oxygen pressure on the CuO/TiO₂ composite photocatalyst are obtained.

Abstract: Ta₂O₅, Ta₂O₅–SrO and Ta₂O₅–TiO₂ photocatalysts were prepared by hydrothermal method and characterized using X-ray diffraction (XRD), Ultraviolet-visible Diffuse Reflectance spectroscopy (UV-Vis DRS) and Thermogravimetry (TGA). In synthesized series of TiO₂-Ta₂O₅ catalysts, formation of anatase TiO₂, hexagonal Ta₂O₅ and titanium tantalates were observed. For Ta₂O₅-SrO (Ta:Sr= 1:1) formation of mixed oxide and crystallinity was observed at calcinations temperature at 1100 °C (5hr). These synthesized catalysts were used for degradation study of methylene blue. The result demonstrated that the photocatalytic activity of the mixed oxides [Ta₂O₅-TiO₂(1:1), Ta₂O₅-TiO₂(2:1), Ta₂O₅-TiO₂(1:2), Ta₂O₅-SrO (Ta:Sr= 1:1)] was higher than that of Ta₂O₅ alone.

Abstract: Microfluidic technology has been increasingly applied in field of photo catalytic reactor because of the large surface to volume ratio, shorter diffusion distance of the reactant solution, higher mixing efficiency and lower cost. This article reviews the detail progress in fabrication of micro-reactor for degradation of dye in waste water. Importantly, dye degradation required uniform UV light exposure which could be resolved by carrying out degradation in a micro-reactor. This paper discussed several of potential and commercial photocatalytic micro-reactor fabrication and configurations, in particular, the polydimethyl siloxane (PDMS) photocatalytic reactors.