A nanocomposites (CNTi) of carbon nitride (CN) and TiO₂ nanoparticles (Ti) of different mass ratios were prepared by a hydrothermal treatment method and characterized using X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET), UV-Vis diffuse reflectance spectroscopy (DRS) and Transmission Electron Spectroscopy (TEM). UV-Vis diffuse spectrum showed that the CNTi composites exhibited absorption in the visible light range. The kinetics of the phenol degradation using the as-prepared nanocomposite photocatalyst compared to the bare TiO₂ nanoparticles was tested using Xenon lamps (mainly a visible light source) as a photoexcitation source in presence and absence of H₂O₂ and/or O₃. The photodegradation of phenol was evaluated using UV spectrophotometer and total organic carbon (TOC). It was revealed that the photocatalytic activity of the CNTi composites significantly higher than TiO₂ nanoparticles. Furthermore, 0.1CNTi composite showed the best phenol degradation when H₂O₂ and O₃ were simultaneously used in which the degradation percentage of phenol was more than 90% within 30 min. Table 1 shows Rate constant, rate coefficient, degradation % (%D) and degradation % from TOC of TiO₂, 0.1CNTi, 0.5CNTi, I CNTi in presence and absence of H₂O₂, 0.1CNTi with O₃ and 0.1CNTi with both H₂O₂ and O₃

Table 1: Rate constant, rate coefficient, degradation % (%D) and degradation % from TOC of TiO₂, 0.1CNTi, 0.5CNTi, I CNTi in presence and absence of H₂O₂, 0.1CNTi with O₃ and 0.1CNTi with both H₂O₂ and O₃