Photocatalytic technology has many new applications and great potential in providing clean energy and decomposing organic pollutants in the environment. Among them, TiO₂ is a good photochemical catalyst, but has a limitation that is only shown in ultraviolet light. To expand the application of photocatalytic materials using solar radiation in visible light, this research focuses on the semiconductor photochemical transformation process. In this study, TiO₂-Eu₂O₃ nanomaterial was synthesised by the sol-gel method with polyvinyl alcohol used as gelling agent. The effects of the contents of TiO₂, Eu₂O₃ and the sintering temperature of the gel were investigated. The obtained material samples were analysed for characteristics and properties by the surface analysis techniques SEM, EDX, TEM, XRD, the infrared spectrum and the UV–vis molecular absorption spectrum. Analysis of modified TiO₂ according to EDX, XRD showed the formation of crystalline and evenly dispersed Eu₂O₃ particles in TiO₂ phases with an average particle size of 20–50 nm. The photocatalytic activity of TiO₂-Eu₂O₃ nanoparticles was determined by the phenol decomposition efficiency in the hypothetical water sample and the actual wastewater samples with a concentration of 10 ppm under ultraviolet light and visible light. The resulting phenol decomposition was more than 90% efficient after about 150 min.

光催化技术在提供清洁能源和分解环境中的有机污染物方面具有许多新的应用和巨大的潜力。其中，TiO ₂是一种很好的光化学催化剂，但有一个局限，就是只在紫外光下表现出来。为扩大利用可见光下太阳辐射的光催化材料的应用，本研究重点研究半导体光化学转化过程。本研究以聚乙烯醇为胶凝剂，采用溶胶-凝胶法合成了TiO ₂ -Eu ₂ O ₃纳米材料。TiO ₂、Eu ₂ O ₃含量的影响并对凝胶的烧结温度进行了研究。通过表面分析技术SEM、EDX、TEM、XRD、红外光谱和UV-vis分子吸收光谱分析获得的材料样品的特性和性能。根据EDX、XRD对改性TiO _{2 的}分析表明，在TiO ₂相中形成结晶且均匀分散的Eu ₂ O ₃颗粒，平均粒径为20-50 nm。TiO ₂ -Eu ₂ O ₃的光催化活性在紫外光和可见光下，通过假设水样和浓度为 10 ppm 的实际废水样品中的苯酚分解效率来确定纳米颗粒。大约 150 分钟后，所得苯酚分解的效率超过 90%。