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Photocatalytic parameters and kinetic study for degradation of dichlorophenol-indophenol (DCPIP) dye using highly active mesoporous TiO2 nanoparticles

Hamad, H.A., Sadik, W.A., Abd El-latif, M.M., Kashyout, A.B., Feteha, M.Y.
Journal of environmental sciences (China) 2016 v.43 pp. 26-39
Fourier transform infrared spectroscopy, X-ray diffraction, catalysts, differential scanning calorimetry, hydrolysis, kinetics, mathematical models, nanoparticles, pH, photocatalysis, porous media, scanning electron microscopy, surface area, temperature, thermogravimetry, titanium, titanium dioxide, transmission electron microscopy, ultraviolet radiation
Highly active mesoporous TiO2 of about 6nm crystal size and 280.7m²/g specific surface areas has been successfully synthesized via controlled hydrolysis of titanium butoxide at acidic medium. It was characterized by means of XRD (X-ray diffraction), SEM (scanning electron microscopy), TEM (transmission electron microscopy), FT-IR (Fourier transform infrared spectroscopy), TGA (thermogravimetric analysis), DSC (differential scanning calorimetry) and BET (Brunauer–Emmett–Teller) surface area. The degradation of dichlorophenol-indophenol (DCPIP) under ultraviolet (UV) light was studied to evaluate the photocatalytic activity of samples. The effects of different parameters and kinetics were investigated. Accordingly, a complete degradation of DCPIP dye was achieved by applying the optimal operational conditions of 1g/L of catalyst, 10mg/L of DCPIP, pH of 3 and the temperature at 25±3°C after 3min under UV irradiation. Meanwhile, the Langmuir–Hinshelwood kinetic model described the variations in pure photocatalytic branch in consistent with a first order power law model. The results proved that the prepared TiO2 nanoparticle has a photocatalytic activity significantly better than Degussa P-25.