Effects of preparation parameters on low temperature formation of TiO2 photocatalysts
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The wastewater containing organic pollutants is becoming a worldwide public health issue. Photocatalysis is a promising technology for the degradation of various organic compounds in wastewater treatment and environmental pollution reduction. Most photocatalysts cannot be widely applied due to their poor photo-response in the visible light region, complexity in preparation and difficulty in recycling. Here, we suggest a facile and modified sol–gel method to synthesize TiO2 nanoparticles at a low temperature. X-ray diffraction (XRD), N2 adsorption–desorption, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), FT-IR spectra, and UV–Vis diffuse reflectance spectra were used to investigate the effects of temperature, heat preservation time, and water amount on the crystal structure, the morphologies, and the properties of the samples. That the sample with ratio of the Ti/H2O mol at 1:3 and dried at 180 °C for 6 h showed the most satisfying photocatalytic activity. The average size of this obtained sample was 4.6 nm, the specific surface area was 241.3817 m2/g, and the band gap was 1.84 eV. The reaction rate constant for the methylene orange degradation under visible light irradiation reached 0.09713 min−1 after 60 min.
This work was supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), Program for Chang Jiang Scholars and Innovative Research Team in University (PCSIRT).
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Conflict of interest
The authors declared that they have no conflicts of interest.
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