Preparation and Visible-light Photocatalytic Performance of Mesoporous Hollow TiO2/WO3 Spheres

doi:10.15541/jim20160377

Abstract

Abstract:

By using titanyl sulfate and ammonia metatungstate (AMT) as precursors and citric acid as a complexing agent, mesoporous hollow spheres of TiO₂/WO₃ composites were prepared via a two-step approach, which included a spray-drying process followed by a high-temperature calcination course. The morphologies, microstructures, surface area, crystal phase, and optical properties of the composites were characterized by SEM, TEM, BET, XRD and UV-Vis DRS. The results showed that the TiO₂/WO₃ composites were well-dispersed mesoporous hollow spheres with diameters around 1 μm, of which the wall consisted of nanoparticles and mesopores. What’s more, nanoparticles and mesopores increased with the calcination temperature. UV-Vis DRS analysis showed that the absorption spectra of TiO₂/WO₃ composites could extend from ultraviolet region to visible region, which was helpful to improve the utilization efficiency of sunlight. In addition, photocatalytic activities of the prepared samples were investigated by photo-degradation of methylene blue (MB). It’s found that the composite containing 3% molar ratio of WO₃ with calcination temperature of 500^oC showed the best photocatalytic activity. The degradation efficiency of MB with this composite could reach 99.1%, much higher than that of P25, which was only 29.5% under the same conditions.

Key words: titania dioxide, tungsten trioxide, mesoporous hollow sphere, photocatalytic, methylene blue

CLC Number:

O643

YU Yang, TONG Ming-Xing, HE Yu-Lan, CHEN Hui, GAO Jing, LI Guo-Hua. Preparation and Visible-light Photocatalytic Performance of Mesoporous Hollow TiO₂/WO₃ Spheres[J]. Journal of Inorganic Materials, 2017, 32(4): 365-371.

Figures/Tables 9

Fig. 1 XRD patterns of samples calcined at different temperatures(a) 435℃; (b) 500℃; (c) 600℃; (d) 700℃

Table 1 Relationship between calcination temperature and grain size of anatase

Temperature/℃	Size/nm
500	9.8
600	21.5
700	48.3

Fig. 2 SEM images of samples calcined at different temperatures(a, e) 435℃; (b, f) 500℃; (c, g) 600℃; (d, h) 700℃

Fig. 3 Nitrogen adsorption-desorption isotherms and pore distribution curves of the TiO2/WO3 composites

Fig. 4 TEM images of TiO2/WO3 composite calcined at 500℃with 3mol% WO3(a, b) TEM images of TiO2/WO3 composites ; (c, d) HRTEM images of TiO2/WO3 composites

Fig. 5 UV-Vis DRS absorption spectra of TiO2/WO3 composites calcined at different temperatures(a) 435℃; (b) 500℃; (c) 600℃; (d) 700℃; (e) P25

Fig. 6 Photocatalytic activities of TiO2/WO3 composites calcined at different temperatures

Fig. 7 Photocatalytic activities of TiO2/WO3 composites with different WO3 percentages

Fig. 8 Separated mechanism of photogenerated electrons- holes in TiO2/WO3 composites

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Preparation and Visible-light Photocatalytic Performance of Mesoporous Hollow TiO₂/WO₃ Spheres

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