Fabrication and analysis of palmitic acid–decanoic acid@Ce–Eu/TiO₂ composite as a building material for regulating indoor environment

Abstract

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.

High fire stability cement composite cementitious material based on semi‐dry gas desulfurized ash/blast furnace slag system: The synergistic effect of nano‐TiO2 and nano‐SiO2

“…Since SGDA and GGBFS provided the larger specific area with more fine particles, adding them in the composite made the water requirement more rigid. Moreover, calcium sulfite possesses a rosette‐like morphology with many leaf‐shaped crystals grown together in aggregates, whose surfaces are covered with pores 38,39 . Thus, such a specific morphology of calcium sulfite imposes a high water requirement.…”

“…Moreover, calcium sulfite possesses a rosette-like morphology with many leaf-shaped crystals grown together in aggregates, whose surfaces are covered with pores. 38,39 Thus, such a specific morphology of calcium sulfite imposes a high water requirement. As a result, the SGDA dramatically increases the water requirement for high specific surface area and peculiar morphology of calcium sulfite.…”

Preparation and Performance of Inorganic Hydrated Salt‐Based Composite Materials for Temperature and Humidity Regulation

“…In addition, the functional gypsum board had high thermal insulation and heat storage capacity, and there was no moisture problem. Zong et al [25] employed Ce-Eu/TiO 2 hollow microspheres as carriers to adsorb organic eutectic PCMs, and the resulting compos-ite materials had the thermal-humidity-photocatalysis synergistic performance. Specifically, its enthalpy was 64.6 J/g.…”

Design and mechanism analysis of decanoic acid-palmitic acid/SiO2@TiO2 phase change microcapsules based on RBF model

“…The describing temperature was maintained at 60 °C under stirring continuously for 2 h, then the decanoic acid-palmitic acid compound PCM obtained. A certain mass of decanoic acid-palmitic acid compound PCM was mixed with anhydrous ethanol and deionized water in 50 o C water bath, medium speed magnetic stirring for 10 min, and then ultrasonic dispersing for 5 min, finally the dispersion liquid of decanoic acid-palmitic acid compound PCM was obtained (Zong et al 2020).…”