Cerous nitrate Ce(NO3)3?6H2O and cupric nitrate Cu(NO3)2?3H2O were used as modifier to make Ce–Cu/TiO2 hollow microspheres. The preparation scheme of Ce–Cu/TiO2 hollow microspheres with uniform particle size distribution was optimized by conducting uniform design and building BP neural network model. Particle size distribution of Ce–Cu/TiO2 hollow microspheres was tested and characterized by laser particle size analyzer (LPSA), the microstructure was characterized by SEM and TEM, the pore structure was tested by brunauer–emmett–teller surface areas analyzer (BET). Humidity performance of Ce–Cu/TiO2 hollow microspheres with uniform particle size distribution was tested by isothermal absorption–desorption, the photocatalysis performance was tested by ultraviolet–visible spectrophotometer (UV–Vis). Finally, optimal technology parameters of Ce–Cu/TiO2 hollow microspheres were obtained. The results showed that the magnetic stirring rate (VMS), dropping rate of solution B added to solution A (VAB), dropping rate of solution D added to solution C (VCD), calcination heating rate (VTC), and calcination temperature (TC) were 910 r/min, 1.32 mL/min, 0.86 mL/min, 2.47℃/min and 485℃, respectively. Besides, for Ce–Cu/TiO2 hollow microspheres with uniform particle size distribution, other sizes were shown as follows: d10 =103.74 nm, d50=141.46 nm and d90 =188.84 nm. Particle size distribution interval of d90–d10 was 85.10 nm. It was also proved that Ce–Cu/TiO2 hollow microspheres with uniform particle size distribution had good photocatalysis and humidity control performance. Specifically, degradation rate of formaldehyde gas was 21.6%~53.9% after 1~6 h, and equilibrium moisture content under the relative humidity of 32.28%~84.34% reached 0.0364~0.2746 g/g accordingly. The above research provided certain theoretical basis and technical support for further systematic research on particle size distribution of Ce–Cu/TiO2 hollow microspheres and photocatalysis–humidity control performance.
Hao ZHANG Yuandi XU Xiuyu LIU
. Optimizing preparation of Ce-Cu/TiO2 hollow microspheres with uniform particle size distribution and its photocatalysis and humidity control performance[J]. The Chinese Journal of Process Engineering, 2019
, 19(1)
: 195
-201
.
DOI: 10.12034/j.issn.1009-606X.218194
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