synthesis and characterization of visible light active s-doped tio2 nanophotocatalyst

s-doped and bare mesoporous tio2 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 2.8 ev. the specific surface area of s-doped tio2 nanoparticles obtained via the bet method, calculated to be 181.3 m2/g and its pore size distribution curve revealed that the average diameter of the pores is 12.3 nm using bjh method. photocatalytic efficiency of synthesized s-doped mesoporous tio2 was tested for degradation of congored azo dye under ultraviolet and visible lights. the results revealed that the s-doped mesoporous tio2 is the most effective under visible light in comparison with bare one.