The C, N and S co-doped TiO2 (C-N-S-TiO2) photocatalyst was prepared by
sol-gel method using titanium n-butoxide [Ti(OC4H9)4] and acetic acid (HAc) as raw
materials and modifier, thiourea (H2N(CS)NH2) as solid substrates and doping source.
The X-ray diffraction, transmission electron microscope, N2 adsorption-desorption
measurements, X-ray photoelectron spectroscopy and UV-visible diffuse reflectance
spectroscopy were used to characterize as-prepared samples. The results indicated that the thermal dissociation process of
H2N(CS)NH2 could introduce doping elements to adjust the band structure and promote the crystal transformation. The
C-N-S-TiO2 photocatalyst showed highly photocatalytic activity under visible light irradiation, and the surface reaction
rate constant was approximately 4 times higher than pure TiO2 sample.