OICC Press International Journal of Nano Dimension 2228-5059 5 4 2024 02 29 A visible light driven doped TiO2 nanophotocatalyst: Preparation and characterization 10.7508/ijnd.2014.04.003 EN S. M. E. Zakeri Separation Processes Research Group (SPRG), Department of Engineering, University of Kashan, Kashan, Iran. M. Asghari Energy Research Institute, University of Kashan, Ghotb-e-Ravandi Ave., Kashan, Iran. M. Feilizadeh Chemical and petroleum Engineering Deportment, Sharif University of Technology, Tehran, Iran. M. Vosoughi Chemical and petroleum Engineering Deportment, Sharif University of Technology, Tehran, Iran. Journal Article 2024 02 29 A useful nanophotocatalyst (La,S-TiO2) was prepared by a sol-gel method and characterized by UV–vis diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), photoluminescence emission spectroscopy (PL) and scanning electron microscopy (FESEM). The results showed that the La,S-TiO2, which calcined at 550 °C, contained only anatase phaseand its crystal size was 23 nm. In addition, the FESEM analysis indicates that the La,S-TiO2 nano particles with diameter of 20 to 25 nm could have a good dispersion in solution. In order to evaluate of activity of the modified synthesized photocatalyst (La,S-TiO2), comparison between modified synthesized TiO2 (La,S-TiO2) and pure synthesized TiO2 for degradation of Methyl Orange was investigated. It was found that the modified synthesized photocatalysis (La,S-TiO2) has much higher photocatalytic activity than undoped TiO2 for the degradation of contamination.