Visible Light Photocatalytic Properties of Bi2O3 Modified BiPO4 Nanorod Composite Photocatalyst

doi:10.15541/jim20140106

Abstract

Abstract:

BiPO₄ nanorod composite photocatalyst with controllable morphology was synthesized by using Bi₂S₃ nanorods as a template. This composite catalyst exhibited excellent photocatalytic performance for methylene blue (MB) degradation under visible light irradiation. UV-Vis diffuse reflectance spectroscopy results showed that the Bi₂O₃modified BiPO₄catalyst had higher visible light absorption. X-ray diffraction and transmission electron microscopy results indicated that as-prepared BiPO₄ catalyst was nanorods with diameter of about 30 nm and length of 200-500 nm. Surface modification with small amount Bi₂O₃ could significantly promote visible light degradation efficiency of MB, which was about 1.7 times higher than that of the unmodified BiPO₄catalyst. Photocurrent and N₂ adsorption experiments showed that the photocurrent and BET specific surface area increased significantly after surface modification. Bi₂O₃modification not only enhanced visible light absorption ability of catalyst but also presented a center for the enhancement of electron transfer. The results showed BiPO₄ catalyst with Bi₂O₃ modification was a high activity photocatalytic material.

Key words: BiPO4 nanorod, Bi2O3 modification, photocatalysis, controllable morphology

CLC Number:

TQ174

DU Quan-Chao, Lü Gong-Xuan. Visible Light Photocatalytic Properties of Bi₂O₃ Modified BiPO₄ Nanorod Composite Photocatalyst[J]. Journal of Inorganic Materials, 2014, 29(11): 1204-1210.

Figures/Tables 10

Fig. 1 TEM image at low magnification (a), HRTEM image (b), EDS spectrum (c) and XRD pattern (d) of Bi2S3 nanorods

Fig. 2 XRD patterns of S1 and S2

Fig. 3 The XPS survey spectra and the high-resolution XPS spectra of the S1 and S2 samples (a) The XPS survey spectra of sample S1 and S2; (b) High-resolution XPS spectra of Bi 4f in sample S1 and S2; (c) High-resolution XPS spectra of P 2p in sample S1 and S2; (d) The fitting curves of high-resolution XPS spectra for Bi 4f of sample S2

Table 1 XPS data of Bi 4f in sample S2

Peak	Area fit	Center /eV
1	3450.66	158.6
2	135987.13	160.1
3	4431.80	163.9
4	108638.16	165.4

Fig. 4 TEM (A and a), HRTEM (B and b) images and EDS spectra (C and c) of S1 and S2 samples

Fig. 5 UV-Vis diffuse reflectance spectroscopy of S1 and S2 samples

Table 2 The BET data of S1 and S2

Samples	S_BET/(m²·g^-1)	V_pore/(cm³·g^-1)	d_pore/nm
S1	2.609	0.039	5.933
S2	6.104	0.077	10.15

Fig. 6 The transient photocurrent-time curves of samples S1 and S2 Reaction conditions: 20 (V/V)% ethanol aqueous solution with 0.1 mol/L K2SO4, λ>420 nm

Fig. 7 Light degradation efficiency of S1 and S2 in methylene blue solution The light source is a xenon lamp, cut-off filter λ> 420 nm, the concentration of methylene blue is 10-5 g/L

Fig. 8 Cyclic experiments of MB degradation over sample S2

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Visible Light Photocatalytic Properties of Bi₂O₃ Modified BiPO₄ Nanorod Composite Photocatalyst

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