Investigation of Photocatalytic Performance of Keggin Type Heteropolyacid in Degradation of Methylene Blue

this project, keggin-type polyoxometalate, cationic exchange Q۵PMoV۲O۴۰ (denoted as TBA-PMoV) was synthesized to produce a recoverable catalyst. This catalyst was characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), Field Emission scanning electron microscopy (FESEM) and UV-vis diffuse reflectance spectroscopy (UV-DRS). The synthesized catalyst showed high photocatalytic activity in the degradation of methylene blue as a pollutant under UV light irradiation. The effect of various factors such as catalyst amount, contact time and pH on degradation of methylene blue (denoted as MB) were investigated. Formal batch adsorption studies was applied for investigation of effects of various parameters, such as initial solution pH, initial dye concentration, catalyst amount, temperature, etc. Optimization results for ۲۰ mg/L methylene blue showed that maximum degradation efficiency ۹۶.۸ % at the optimum conditions was found to be: catalyst amount ۲۵ mg, pH= ۷.۶ and time ۶۰ min at ambient pressure and temperature.

Keywords:

degradation , Photocatalytic , Heteropolyacid , Methylene blue