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

• Published in: Journal of environmental sciences (China) 2016-05, Vol.43, p.26-39
• Main Authors: Hamad, H.A., Sadik, W.A., Abd El-latif, M.M., Kashyout, A.B., Feteha, M.Y.
• Format: Article
• Language: English
• Subjects: 2,6-Dichloroindophenol - chemistry; Kinetics; Mesoporous TiO2; Microscopy, Electron, Scanning; Microscopy, Electron, Transmission; Models, Chemical; Nanoparticles - chemistry; Organic dye; Photocatalytic degradation; Photochemical Processes; Spectroscopy, Fourier Transform Infrared; Titanium - chemistry; X-Ray Diffraction
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/j.jes.2015.05.033

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. [Display omitted]