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Titanium dioxide is widely studied as a promising semiconductor that finds application in the conversion of solar energy as an active photocatalyst. However, the photocatalytic activity of TiO2 is limited to the absorption in ultraviolet region (3.0–3.2 eV). Recent studies show that the creation of various defects state such as oxygen vacancies (appearance of Ti3 + state) can reduce the band gap and enhance photocatalytic processes under visible light irradiation. In this work, titanium dioxide was prepared by laser ablation of a titanium metal target in water exposed to pulsed radiation from a Nd:YAG laser (1064 nm, 7 ns, 20 Hz, 160 mJ/pulse). After ablation the colloidal solution was subjected to additional irradiation with the same laser. Then colloidal solutions were dried in air to obtain powders and then annealed at temperatures of 250–800 C. According to the X-ray analysis data, the samples mainly consist of the anatase phase with a small admixture of rutile. Powders have 21 PYOUNG SCIENTISTS SESSION SESSION Y intense absorption in the visible region is associated with the presence of various nature defect states of in the structure which also correlate with photoluminescence data. The catalysts were examined in the process of photocatalytic decomposition of the dye Rhodamine B under LED source (375 nm) and a visible region broad band lamp source (Philips Master Color CDM-TD 70W/942 lamp with a YG- 11 light filter). It was found that the materials exhibit good activity under both LED and broadband source irradiation. The influence of the nature of defects on the efficiency and mechanisms of dye destruction is considered.