Synergetic Photodegradation Of Azo Dyes On Molybdenum Trioxide And Ketone Photosensitizers

In this study a new approach for degradation of azo dyes on none-nanosized particles was investigated. The photocatalysts based on MoO₃ and the additional of photosensitizer-acetone and benzophenone (BPH) were easily prepared for detoxification of water containing methyl orange (MO), which was used as a model compound.In order to ensure the effective factors on the subsequent experiment such as selecting optimum calcined temperature photocatalysts, feeding amount of photocatalysts and irradiation time and so on, the kinetics and experimental factors of MoO₃ photocatalytic reaction without any additional photosensitizer were studied firstly.Two kinds of phase ketone photosensitizers-acetone and benzophenone (BPH), high conversion from the excited singlet state to the triple one, were used to design the complex photocatalytic systems. Acetone, liquid phase and transparent at room temperature, which are better than the sensitized dyes by less disturbing the absorbance, is a good homogeneous photocataiyst with high efficiency. Base on the idea of converting the homogeneous catalyst to the heterogeneous one, acetone was loaded into the surface of MoO₃ particles. The DRS (the diffuse reflectance UV-vis adsorption) spectra of loaded acetone showed a shift toward ultraviolet region and the band gap became larger. Additionally, benzophenone (BPH) as a water insoluble solid loaded into the surface of MoO₃ particles was to explore a new approach for the transport, storage and recycle of catalysts. The LRS (Laser Raman Spectroscopy) showed the relative between BPH loaded amount and catalysts activity.