Environmental problems associated with water pollution caused by organic dyes have raised serious concerns. In this context, photocatalytic processes have proven to be promising and environmentally friendly methods for water purification utilising abundant solar energy. In this study, a SrTiO₃-based photocatalyst was modified by doping with Al ions and the deposition of dual co-catalysts (Rh/Cr₂O₃ and CoOOH) to enhance the photocatalytic decomposition efficiency of methylene blue (MB). Pure perovskite SrTiO₃ was synthesised by chemical precipitation followed by calcination at 1100 °C. Al-doped SrTiO₃ with deposited co-catalysts showed 3.2 times higher photocatalytic activity compared to unalloyed SrTiO₃ with co-catalysts in MB decomposition under visible radiation. This study highlights the effectiveness of using dual co-catalysts and low-valence metal doping to enhance the efficiency of the photocatalytic decomposition of organic pollutants. The density functional theory analysis results show that the Al doping of SrTiO₃ improves charge separation and increases the lifetime of photogenerated electrons and holes while maintaining the size of the forbidden band, which confirms its effectiveness for enhancing photocatalytic activity.

The influence of He ion implantation on the interaction of La_1-xSr_xScO_3-x/2 with air has been studied. Features of the effect of implantation on the state of the surface of irradiated materials are revealed. The temperature dependences of the yield of carbon dioxide and water from La_1-xSr_xScO_3-x/2 samples unirradiated and irradiated with He ions were obtained. It is shown that the implantation of He ions into LaScO₃ and La_0.9Sr_0.1ScO_2.95 and subsequent heating in air to 1150°C leads to a decrease in the activity of these materials with respect to CO₂ and practically does not prevent the dissociative dissolution of water into these materials.