Controllable Synthesis and Photocatalytic Performance of BiVO4 under Visible-light Irradiation

doi:10.15541/jim20180257

Abstract

Abstract:

Visible-light-driven photocatalyst BiVO₄ was synthesized via a facile microwave-hydrothermal method using BiVO₃·5H₂O and NH₄VO₃ as raw materials. Crystal structure of BiVO₄ photocatalyst could be selectively controlled to be tetragonal or monoclinic by simply adjusting the pH of the precursor solution. The prepared samples were characterized by XRD, UV-Vis, Raman, and SEM. The mechanism of BiVO₄ formation with different crystal structures was discussed. Meanwhile, the photocatalytic performances of the prepared sample were evaluated by degradation of methylene blue and photocalytic oxidation of NO gas in air under visible light irradiation. The results showed that BiVO₄(z-t) microsphere was obtained when the precursor pH is 3-5, but when the pH is less than 2 or greater than 7, the as-prepared powders are BiVO₄(s-m) with polyhedron morphology. This may be due to the change of pH that could form transformation of vanadate and bismuth ion in the precursor solution, and then affect the formation process of BiVO₄, resuting in the change of crystal structure, morphology, crystal surface, and VO₄ tetrahedron of BiVO₄(s-m). The photocatalytic tests indicated that the activity of BiVO₄(s-m) was much better than that of BiVO₄(z-t). The BiVO₄(s-m) sample prepared at pH 9 exhibits excellent visible-light photocatalytic activity, because of its higher crystalline, preferentially exposed facts (040), and higher degree distortion of VO₄^3- tetrahedron.

Key words: BiVO₄, microwave hydrothermal, controllable synthesis, photocatalytic

CLC Number:

O643

LI Jie, SONG Chen-Fei, PANG Xian-Juan. Controllable Synthesis and Photocatalytic Performance of BiVO₄ under Visible-light Irradiation[J]. Journal of Inorganic Materials, 2019, 34(2): 164-172.

Figures/Tables 12

Fig. 1 Schematic reactor for visible light photocatalytic degradation (a) and transmittance of the combined light filters (b)1: Cylindrical pyrex vessel; 2: Tungsten halogen lamp; 3: Cutoff filter; 4: Reactor; 5: Saturated cupric acetate solution; 6: Petri dish

Fig. 2 XRD patterns of BiVO4 sample prepared at different pH

Fig. 3 Local XRD patterns of BiVO4(s-m) samples

Fig. 4 Diffuse reflectance spectra of BiVO4 sample prepared at different pH

Fig. 5 FT-IR (a) and Raman (b) spectra of BiVO4(s-m) sample prepared at different pH

Table 1 Raman absorption band position and V-O bond length, FWHM in BiVO4(s-m)

pH	ν_s(V-O)/cm^-1	R₁/nm	S_1(V-O)	ν_as(V-O)/cm^-1	R₂/nm	S_2(V-O)	Valence state of V	FWHM
1	828.57	0.17071	1.3264	708.40	0.17760	1.0431	5.0223	43.80
2	830.12	0.16934	1.3303	708.93	0.17757	1.0443	5.0352	44.71
7	830.83	0.16929	1.3320	710.53	0.17745	1.0478	5.0438	45.49
9	831.19	0.16927	1.3329	710.71	0.17744	1.0482	5.0469	45.93
11	829.76	0.16936	1.3294	709.64	0.17751	1.0459	5.0342	45.41
13	829.42	0.16938	1.3285	708.93	0.17757	1.0443	5.0298	44.04

Fig. 6 SEM images of BiVO4 sample prepared at different pH and HRTEM image of BiVO4 (pH=9)

Fig. 7 XPS spectra for BiVO4(s-m) samples prepared at different pH

Fig. 8 Time-dependent UV-Vis absorption spectra of the MB solution in the presence of BiVO4(pH 9)

Fig. 9 Photocatalytic activity of BiVO4 sample prepared at different pH

Fig. 10 Stability of BiVO4 (pH 9) catalyst in the degradation of MB

Fig. 11 Photocatalytic performances of BiVO4 for decomposing NO(a) Blank; (b) BiVO4 (pH 9)

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Controllable Synthesis and Photocatalytic Performance of BiVO₄ under Visible-light Irradiation

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