The BaTiO₃/TiO₂/CeO₂ smart composites with double type II band arrangement structures were synthesized by a hydrothermal synthesis method. This study attempted to improve the photoluminescence performance and photocatalytic activity by introducing anatase TiO₂ or two kinds of metal species, cubic CeO₂ and anatase TiO₂, fabricated as BaTiO₃/TiO₂ or BaTiO₃/TiO₂/CeO₂ smart composites. Rietveld refinement analysis revealed a typical tetragonal structure with P4mm(99) space group of pure BaTiO₃ smart materials and BaTiO₃/TiO₂/CeO₂ smart composites consist of tetragonal BaTiO₃, cubic CeO₂ and anatase TiO₂. The surface morphology, color, optical absorption coefficient, photoluminescence performance and photocatalytic activity showed strong CeO₂ content - dependent behavior. For the pure BaTiO₃ smart materials, three obvious emission peaks at 420, 460 and 470 nm can be observed when the excitation wavelength is 295 nm. The introduction of TiO₂ into the pure BaTiO₃ smart materials to construct BaTiO₃/TiO₂ smart composites resulted in redshift of emission peak. When TiO₂ and CeO₂ were introduced into the pure BaTiO₃ smart materials, the intrinsic fluorescence emission peak of BaTiO₃ was almost quenched. Oxygen vacancy, Ce-4f level and impurity level promote the electron hole pair recombination, which is beneficial to enhance the photoluminescence of the system, but unfavorable to their photocatalytic activity. The BaTiO₃/(15 wt%) TiO₂/(15 wt%) CeO₂ smart composites exhibit a highest photocatalytic activity for the photocatalytic degradation of methylene blue under ultraviolet light irradiation.

采用水热合成法合成了具有双II型能带排列结构的BaTiO ₃ /TiO ₂ /CeO ₂智能复合材料。本研究试图通过引入锐钛矿型TiO ₂或两种金属物种，立方CeO ₂和锐钛矿型TiO ₂，制备BaTiO ₃ /TiO ₂或BaTiO ₃ /TiO ₂ /CeO ₂智能复合材料来提高光致发光性能和光催化活性。Rietveld精修分析揭示了纯BaTiO ₃智能材料和BaTiO ₃具有P4mm(99)空间群的典型四方结构/TiO ₂ /CeO ₂智能复合材料由四方BaTiO ₃、立方CeO ₂和锐钛矿TiO _{2 组成}。表面形貌、颜色、光吸收系数、光致发光性能和光催化活性表现出强烈的CeO ₂含量依赖性行为。对于纯BaTiO ₃智能材料，当激发波长为295 nm时，可以在420、460和470 nm处观察到三个明显的发射峰。将TiO ₂引入纯BaTiO ₃智能材料中构建BaTiO ₃ /TiO ₂智能复合材料导致发射峰红移。当二氧化钛₂和的CeO ₂引入到纯的BaTiO ₃的智能材料，钛酸钡的固有荧光发射峰₃几乎淬灭。氧空位、Ce-4f能级和杂质能级促进电子空穴对复合，有利于增强体系的光致发光，但不利于其光催化活性。BaTiO ₃ /(15 wt%) TiO ₂ /(15 wt%) CeO ₂智能复合材料在紫外光照射下对亚甲基蓝的光催化降解表现出最高的光催化活性。