Controllable Synthesis of WO3 Nanowires by Electrospinning and Their Photocatalytic Properties Under Visible Light Irradiation

doi:10.1007/s40195-014-0138-z

Abstract

Abstract:

Large amounts of WO₃ nanowires were prepared on silicon substrates by electrospinning followed by appropriate calcinations in air using ammonium metatungstate (AMT) as WO₃ source. Tunable densities and diameters of WO₃ nanowires were achieved by changing the electrospinning time and the concentration of AMT in precursor solution. TG/DSC analysis was used to direct the heating process. The effects of both solvent ratio and heating process on the morphology of the obtained nanowires were investigated. The morphology, structure, and chemical compositions of the tungsten oxide were characterized by SEM, XRD, and EDX, respectively. Results showed that monoclinic phase WO₃ nanowires with diameters ranging from 100 to 200 nm were obtained after the appropriate heating process when the AMT concentration of the precursor solution increased from 10 to 20 wt%. The photocatalytic performance of the obtained WO₃ nanowires under visible light irradiation (>420nm) was investigated in the degradation of Rhodamine B at room temperature in air.

Key words: Nanowires, Electrospinning, Photocatalysis

Zhe Chen, Wu Wang, Kaigui Zhu. Controllable Synthesis of WO₃ Nanowires by Electrospinning and Their Photocatalytic Properties Under Visible Light Irradiation[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(1): 1-6.

Figures/Tables 6

Fig.1 Simultaneous TG/DSC curves of AMT/PVP nanofibers

Fig.2 SEM imagines of the nanowires calcined in mode A a, b and in mode B c-f

Fig.3 EDX spectrum of the nanowires calcined for 3 h at mode B

Fig.4 XRD curves of monoclinic WO3 a and products calcined at mode B b

Fig.5 Photocatalytic degradation rate of Rh B under the light (>420 nm) irradiation

Fig.6 The degradation mechanism of Rh B under light irradiation

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Controllable Synthesis of WO₃ Nanowires by Electrospinning and Their Photocatalytic Properties Under Visible Light Irradiation

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