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Enhanced Photocatalytic Activity of TiO2 Modified with GaI toward Environmental Application

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journal contribution
posted on 27.12.2019, 13:39 by Shraddha Jadhav, Ricardo Navarro-Mendoza, Paulina Lozano-Sotomayor, Ignacio R. Galindo-Esquivel, Oracio Serrano, Juan M. Peralta-Hernández
Gallium (Ga) ion-doped TiO2 (Ga-TiO2) nanocomposite with small particle size (9–10 nm) and high surface area (104 m2/g) has been easily synthesized via sol–gel method at low temperature by using low-valent GaI as a doping precursor. The structural and morphological characterization of Ga-TiO2 was carried out with standard analytical and spectroscopic techniques. Ga doping into the TiO2 matrix inhibited a phase transformation from anatase to rutile (photocatalytically inactive) form, even at a higher temperature of 750 °C. Finally, Ga-TiO2 nanocomposite showed high photocatalytic activity and exhibited 97% degradation of acid violet 63 dye within 60 min. The dye degradation rate constant was calculated as 1.6 × 10–1 and 1.4 × 10–1 min–1 under UV and white light irradiation, respectively, which is higher, as compared to the previously reported Ga-TiO2 composites to date.