Synthesis and characterization of visible light active S-doped TiO۲ nanophotocatalyst

S-doped and bare mesoporous TiO۲ were prepared using titanium tetraisopropoxide and thiocarbamide as raw materials. Prepared materials were characterized by means of fourier transform infrared spectroscopy FT-IR, thermogravimetry-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), UV–Vis absorption spectroscopy, Brunauer–Emmett–Teller (BET) specific surface area and Barrett–Joyner–Halenda (BJH) pore size distribution analyses, scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDX). The band gap of S-doped was estimated from UV-Vis spectroscopy data to be ۲.۸ eV. The specific surface area of S-doped TiO۲ nanoparticles obtained via the BET method, calculated to be ۱۸۱.۳ m۲/g and its pore size distribution curve revealed that the average diameter of the pores is ۱۲.۳ nm using BJH method. Photocatalytic efficiency of synthesized S-doped mesoporous TiO۲ was tested for degradation of Congored azo dye under ultraviolet and visible lights. The results revealed that the S-doped mesoporous TiO۲ is the most effective under visible light in comparison with bare one.

Keywords:

Band gap , Congored , Mesoporous , photocatalyst , S-doped TiO۲