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Abstract: TiO₂ was prepared by the hydrolyzation method in (NH₄)₂SO₄-modified TiCl₄ solution, and TiO₂ photocatalysts were obtained by accelerating the precipitation of TiO₂ powder in a high-temperature water bath. The photocatalysts were characterized by Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), Raman spectrum and UV-Vis (Ultraviolet-Visible) spectrometry techniques, and the photocatalytic activity in phenol-contaminated water was investigated. The results showed that photocatalysts calcined at 400 °C had a specific surface area of 138.2 m²/g and an average particle size of 9 nm, and a significant increase in thermal stability of anatase phase. At the calcination temperature of 700 °C, the crystal form of TiO₂ started to change into rutile (anatase: 97%, rutile: 3%). The activity of TiO₂ photocatalysts prepared with (NH₄)₂SO₄-modified TiCl₄ solution was markedly stronger than that without (NH₄)₂SO₄-modified TiCl₄ solution. Maximal photocatalytic activity was observed at the mole ratio of Ti:(NH₄)₂SO₄=1:2, the water-bath temperature of 90 °C and the calcination temperature of 700 °C.

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