Preparation of Environment Coordination Ce-La/TiO2 Composites and Photocatalytic-moisture-heat Properties
Zhi-fang ZONG1,*(), Lin YANG2, Hao ZHANG1,3, Lei XIONG2
1 School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan 243032, Anhui, China 2 Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou 510050, China 3 Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Ministry of Education), Anhui University of Technology, Maanshan 243032, Anhui, China
The uniform experiment design and multivariate nonlinear regression equation were adopted to study the effect of Ce-La dosage (the mole ratio of Ce-La to tetrabutyl titanate), the mole ratio of Ce to La, calcination temperature, and amount of tetraethyl orthosilicate (the volume ratio of tetraethyl orthosilicate to tetrabutyl titanate) on the moisture absorption-desorption and photocatalytic properties of Ce-La/TiO2 hollow microspheres, so as to ensure the optimal preparation parameters of Ce-La/TiO2 hollow microspheres. Then, the decanoic-palmitic acid were pressed into the cavity of the optimal Ce-La/TiO2 hollow microspheres by vacuum absorption to prepare environment coordination Ce-La/TiO2 composite materials and analyze the photocatalytic-mositure-heat properties. The scanning electron microscopy and laser particle size analyzer were used to characterize the microscopic morphology and particle size distribution. The results show that the four factors all have effect on the moisture absorption-desorption and photocatalytic properties of Ce-La/TiO2 hollow microspheres, primary and secondary sequence of each factor is Ce-La dosage > amount of tetraethyl orthosilicate > the mole ratio of Ce to La > calcination temperature. The optimization program is Ce-La dosage 0.76%, the mole ratio of Ce to La is 1.0, calcination temperature 646℃, and amount of tetraethyl orthosilicate 0.63. The Ce-La/TiO2 composites have good moisture absorption-desorption, photocatalytic and phase changing temperature-adjusting properties. Under 43.16%-75.29% relative humidity, the equilibrium humidity content reaches 0.0576g/g, the degradation rate to formaldehyde reaches 56.37% after 5h, the cooling time lasting nearly 500s during 30-15℃, so the Ce-La/TiO2 composites have remarkable and sustainable phase changing platform.
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