Abstract
Building materials that have the ability to passively regulate the indoor environment can reduce building energy consumption. Decylic acid-palmitic acid@Ce-Eu/TiO2 (D-P@Ce-Eu/TiO2) composites are a new kind of functional material which has that potential. In this study, D-P@Ce-Eu/TiO2 composites were formed using a two-step procedure. First, Ce-Eu/TiO2 hollow microspheres were prepared by sol-gel method, then decylic acid-palmitic acid composite phase change material (D-PCPCM) was encapsulated into the Ce-Eu/TiO2 hollow microspheres by vacuum absorption. The purpose of this work was to study the factors in the preparation of D-P@Ce-Eu/TiO2 composites that are important for photocatalysis-heat-humidity performance. The results showed that D-P@Ce-Eu/TiO2 composites reached optimal performance when using a Ce-Eu dosage (the molar ratio of Ce-Eu to tetrabutyl titanate (TBOT)) of 0.9 mol%, the mole ratio of Ce to Eu of 1.0, volume ratio of tetraethyl orthosilicate (TEOS) to TBOT of 0.4, calcination temperature of 500 °C, mass ratio of D-PCPCM to Ce-Eu@TiO2 hollow microspheres of 0.45, and vacuum level during encapsulation of 4 × 104 Pa. The degradation rate to formaldehyde of D-P@Ce-Eu/TiO2 composites made with the optimal synthesis parameters was measured to be 61.08% after 6 h. This composite material had an obvious phase transition temperature at 20 °C–22 °C, and a humidity storage capacity that could reach 0.1779 g g−1 with relative humidity of 84.12%. Both of these factors can significantly improve conditions for human comfort.
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