Fabrication of TiO2/WO3 Micro-nanofibers Composites and Their Photocatalytic Activity

doi:10.3724/SP.J.1077.2014.13493

Abstract

Abstract:

PVP/Ti(OC₄H₉)₄/N₅H₃₇W₆O₂₄·H₂O precursors with different Ti/W molar ratios were successfully synthesized by a simple combination method of Sol-Gel and electrospinning techniques. The electrospun precursors was converted into TiO₂/WO₃ micro-nanofibers via calcination at different temperatures in air. The obtained samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (FE-SEM) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis) techniques. Photocatalytic activity was evaluated by degradation of methylene blue (MB) under ultraviolet light irradiation. The results showed that WO₃-doped TiO₂ micro-nanofibers with Ti/W molar ratio of 12:1 and TiO₂/WO₃ micro- nanofibers with Ti/W molar ratio of 4:1 after calcination at 500℃ exhibited better photocatalytic degradation activity than that of pure TiO₂ micro-nanofibers.

Key words: electrospun, TiO₂/WO₃ composite, micro-nanofiber, photocatalytic activity

CLC Number:

O614

MENG Shu-Qian, ZHOU De-Feng, ZHU Xiao-Fei, YANG Guo-Cheng, LI Zhao-Hui. Fabrication of TiO₂/WO₃Micro-nanofibers Composites and Their Photocatalytic Activity[J]. Journal of Inorganic Materials, 2014, 29(6): 605-613.

Figures/Tables 10

Fig. 1 XRD patterns of pure TiO2 (a), pure WO3 (b) and TiO2/ WO3 composite (c) samples calcined at different temperatures

Fig. 2 XRD patterns of TiO2 ,WO3 and TiO2/WO3 micro- na-no-f-ibers with different Ti/W molar ratios calcined at 500℃ (a) TiO2; (b) WO3; (c) TW-12; (d) TW-10; (e)TW-8; (f) TW-6; (g)TW-4; (h) TW-2

Fig. 3 FT-IR spectra of the precursors calcined at different temperatures (a) PVP/Ti(OC4H9)4/N5H37W6O24·H2O (n(Ti):n(W)=2:1) precursors, (b)-(f) Precursors calcined at 400, 500, 600, 700 and 800℃, respectively

Fig. 4 FT-IR patterns of TiO2, WO3 and TiO2/WO3 micro- nan-o-fiber composites with different Ti/W molar ratios calcined at 500℃ (a) TiO2; (b) WO3; (c) TW-12; (d) TW-10; (e) TW-8; (f) TW-6; (g) TW-4; (h) TW-2

Fig. 5 SEM images of TiO2, WO3 and TiO2/WO3 micro-nanofibers with different Ti/W molar ratios calcined at 500℃ (a) TiO2; (b) WO3; (c) TW-8; (d) TW-6; (e) TW-4; (f ) TW-2; (g) Magnified FE-SEM image of TW-4; (h) Magnified FE-SEM image of TW-2

Table 1 Specific surface area of TiO2, WO3 and TiO2/WO3 micro-nanofibers with different Ti/W molar ratios calcined at 500℃

Sample	S_BET/(m²?g^-1)
TiO₂	8.48
TW-12	9.04
TW-4	40.97
TW-2	17.92

Fig. 6 UV-Vis diffuse reflectance spectra of TiO2, WO3 and TiO2/WO3 micro-nanofibers with different Ti/W molar ratios calcined at 500℃ (a) TiO2; (b) TW-12; (c) TW-8; (d)TW-6; (e) TW-4; (f ) TW-2; (h) WO3

Fig. 7 Photocatalytic degradation of MB over TiO2/WO3 (n(Ti): n(W) = 2:1) micro-nanofibers composites calcined at different temperatures under UV light irradiation (a) MB; (b) Calcined at 400℃; (c) Calcined at 500℃; (d) Calcined at 600℃; (e) Calcined at 700℃; (f) Calcined at 800℃

Fig. 8 Photocatalytic degradation of MB over TiO2, WO3 and TiO2/WO3 micro-nanofibers with different Ti/W molar ratios under UV light irradiation (a) MB; (b) TiO2; (c) TW-12; (d) TW-8; (e)TW-6; (f ) TW-4; (g) TW-2; (h) WO3

Fig. 9 Mechanism schematic diagram of TiO2/WO3 micro- nanofiber composites

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Fabrication of TiO₂/WO₃Micro-nanofibers Composites and Their Photocatalytic Activity

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