Novel palmitic acid–decanoic acid@Ce–Eu/TiO₂ (PA–DA@Ce–Eu/TiO₂) microspheres with high photocatalysis–thermal–humidity collaborative performance were prepared via a two‐step method. Ce and Eu were used for codoping to modify the TiO₂ hollow microspheres to enhance the photocatalytic properties. Furthermore, a eutectic phase change material (PA–DA) was combined with Ce–Eu/TiO₂ hollow microspheres to prepare PA–DA@Ce–Eu/TiO₂ microspheres. X‐ray diffraction and UV–VIS spectral analyses proved that Ce–Eu codoping enhanced the photocatalytic properties of the PA–DA@Ce–Eu/TiO₂ microspheres under solar light; the degradation rate to gaseous formaldehyde at low concentrations reached 54.98% after 5 h. The pore structure, particle size distribution, microstructure, and thermostability of the PA–DA@Ce–Eu/TiO₂ microspheres were determined using N₂ adsorption isotherms, laser scattering particle size distribution analysis, scanning electron microscopy, and thermogravimetric analysis, respectively. The results showed that the Ce–Eu/TiO₂ microspheres had a typical mesoporous structure, concentrated particle size distribution, and rough surface. The porous structure of the PA–DA@Ce–Eu/TiO₂ microspheres was conducive to adsorb/desorb moisture, which was recorded to be 0.0575 g/g at 43.16–75.29% relative humidity. The differential scanning calorimeter analysis showed that the phase transition temperature of the PA–DA@Ce–Eu/TiO₂ microspheres was 20–22°C and that the PA–DA@Ce–Eu/TiO₂ microspheres were stable at 35°C. After 300 thermal cycles, the heat storage capacity of the PA–DA@Ce–Eu/TiO₂ microspheres decreased by only 5%. Thus, we concluded that the PA–DA@Ce–Eu/TiO₂ microspheres can purify air and control indoor thermal and humidity environments simultaneously and hence can be used as functional building materials to adjust the indoor environment.

中文翻译：

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棕榈酸-癸酸@ Ce-Eu / TiO2复合材料作为调节室内环境的建筑材料的制备与分析

通过两步法制备了具有高光催化-热湿协同性能的新型棕榈酸-癸酸@ Ce-Eu / TiO ₂（PA-DA @ Ce-Eu / TiO ₂）微球。Ce和Eu用于共掺杂以修饰TiO ₂中空微球，以增强光催化性能。此外，将共晶相变材料（PA-DA）与Ce-Eu / TiO ₂中空微球混合，制备PA-DA @ Ce-Eu / TiO ₂微球。X射线衍射和UV-VIS光谱分析证明Ce-Eu共掺杂增强了PA-DA @ Ce-Eu / TiO ₂的光催化性能。太阳光下的微球；5小时后，低浓度下气态甲醛的降解率达到54.98％。PA-DA @ Ce-Eu / TiO ₂微球的孔结构，粒度分布，微结构和热稳定性分别通过N ₂吸附等温线，激光散射粒度分布分析，扫描电子显微镜和热重分析确定。结果表明，Ce–Eu / TiO ₂微球具有典型的介孔结构，集中的粒径分布和粗糙的表面。PA–DA @ Ce–Eu / TiO ₂的多孔结构微球有利于吸附/解吸水分，在相对湿度为43.16–75.29％时记录为0.0575 g / g。差示扫描量热仪分析表明，PA–DA @ Ce–Eu / TiO ₂微球的相变温度为20–22°C，PA–DA @ Ce–Eu / TiO ₂微球在35°C时稳定。 。经过300次热循环后，PA–DA @ Ce–Eu / TiO ₂微球的储热能力仅降低了5％。因此，我们得出结论，PA–DA @ Ce–Eu / TiO ₂微球可以净化空气并同时控制室内的热和湿度环境，因此可以用作功能性建筑材料来调节室内环境。