The survey of Phothocatalytic degradation of naphthalene by TiO2 doped with Nitrogen-Sulfur and Phosphor under visible light

Subject Areas : Water and Environment

Bahman Banaei ¹ (Department of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran)
Farhang Tirgir ² (Department of Chemistry, Faculty of Sciences, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran. *(Corresponding Author))
Amir hessam Hassani ³ (Faculty of Natural Resources and Environment, Department of Environmental Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.)
Abdolmajid Fadaei ⁴ (Department of Environmental Health Engineering, School of Health, Shahrekord University of Medical Sciences, Shahrekord, Iran.)
Seyd Mehdi Borghei ⁵ (Department of Chemistry and Environment, Faculty of Chemistry and Oil Industry, Sharif University of Technology, Tehran, Iran.)

Received: 2022-08-15 Accepted : 2022-12-07 Published : 2023-06-22

Keywords: Phosphor, Photocatalytic degradation, photocatalyst, TiO2, Removal of Naphthalene,

Abstract :

Background and Objective: Naphthalene is one of the toxic and dangerous polycyclic aromatic hydrocarbons (PAHs) for human and the environment, and it is necessary to remove it from the environment. The aim of this research is to investigate the phothocatalytic degradation of naphthalene from aqueous environments using two nanocatalysts TiO2-N, S/SiO2 and TiO2-P/SPA under visible light in the presence of Oxygen.   Material and Methodology: This research was done in year 2019.  In this research, two phothocatalysts TiO2-N, S/SiO2 and TiO2-P/SPA were synthesized by sol-gel method and they were used to remove Naphthalene from the aqueous environments under visible light and in the presence of Oxygen.  The Effect of various parameters including the initial concentrations of naphthalene, pH, contact time were investigated, and the structure of these nanoparticles was investigated using scanning electron microscopy (SEM), energy-dispersive ray (EDAX) image and UV-Vis differential reflectance spectroscopy (DRS) analysis. Findings: SEM image showed the nanoparticle size of synthetic phothocatalysts to be 10 to 20 nm and, the thickness of the phothocatalyst thin layer TiO2-N, S and TiO2-P on the microspheres was 698.68 nm and 1.73 µm, respectively. DRS analysis indicated that the energy band gap of both phothocatalysts has become narrower than TiO2 and their phothocatalytic activity has been transferred to the visible light region. In the optimal conditions of Naphthalene removal, the values of pH, time, Naphthalene concentration, and removal efficiency were obtained for TiO2-N, S equal to 5, 50, 25, 94.23% and for TiO2-P equal to 5, 40, 25, 97.39%, respectively (Pv<0.05). Discussion and Conclusion: These photocatalysts can be used as a new, effective and practical method in the treatment of water and wastewater from industrials containing Naphthalene under sunlight and visible light.

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