Preparation of BiPO4/BiVO4 Composites with High Visible-light Photocatalytic Activity†

doi:10.7503/cjcu20160476

Abstract

Abstract:

BiPO₄/BiVO₄ composites were prepared by combining hydrothermal and solvothermal synthetic methods. Field emission scanning electron microscopy(FESEM) and transmission electron microscopy(TEM) revealed that the as-prepared BiVO₄ exhibited a truncated bipyramid morphology with high {010}, {110} exposed facets, and that the as-obtained BiPO₄ nanoparticles were grown on the surface of BiVO₄, leading to the formation of the BiPO₄/BiVO₄ heterojunction. The transient photocurrent-time behaviors indicated that the formed heterojunction made the transfer and separation of the photo-generated carriers more efficient. The as-synthesized BiPO₄/BiVO₄ composites exhibited high photocatalytic activities in the degradation of rhodamine B under visible-light irradiation. It was found that the sample prepared with a BiPO₄/BiVO₄ molar ratio of 3:10 in the reactants showed the best performance.

Key words: BiVO₄, BiPO₄, Heterojunction, Visible-light photocatalysis

CLC Number:

O644
O614

TrendMD:

LIU Qiongjun, LIN Bizhou, LI Peipei, GAO Bifen, CHEN Yilin. Preparation of BiPO₄/BiVO₄ Composites with High Visible-light Photocatalytic Activity^†[J]. Chem. J. Chinese Universities, 2017, 38(1): 94.

Figures/Tables 10

Fig.1 XRD patterns of the BiPO4/BiVO4 samples

Fig.2 FESEM images of BiVO4(A, B) and P3(C, D) and HRTEM images of P3(E, F) with different magnification

Table 1 Molar ratio of BiPO4 to BiVO4, specific surface areas(SBET) and band gap energies of the as-synthesized composites

Sample	Molar ratio of BiPO₄ to BiVO₄	S_BET/(m²·g^-1)	Band gap energy/eV
BiVO₄		5.6	2.36
P1	1:10	5.7	2.36
P2	2:10	5.2	2.34
P3	3:10	5.5	2.35
P4	4:10	5.7	2.35
P5	5:10	5.4	2.34

Fig.3 XPS spectra of BiVO4, BiPO4 and P3(A) Bi4f; (B) V2p; (C) O1s; (D) P2p.

Table 2 Binding energies(eV) of related elements in samples

Sample	B $i 4 f 52$	B $i 4 f 72$	$V 2 p 12$	$V 2 p 32$	P₂_p	O₁_s
BiVO₄	164.1	158.7	519.2	517.2		532.4, 530.4
BiPO₄	164.1	158.7			132.6	532.2, 530.2
P3	165.1	159.7	517.7	516.0	132.2	531.2, 529.5

Table 2 Binding energies(eV) of related elements in samples

Sample	B $i 4 f 52$	B $i 4 f 72$	$V 2 p 12$	$V 2 p 32$	P₂_p	O₁_s
BiVO₄	164.1	158.7	519.2	517.2		532.4, 530.4
BiPO₄	164.1	158.7			132.6	532.2, 530.2
P3	165.1	159.7	517.7	516.0	132.2	531.2, 529.5

Fig.4 UV-Vis DRS spectra of BiVO4(a), P1(b), P2(c), P3(d), P4(e), P5(f) and BiPO4(g)

Fig.5 Photoluminescence spectra of BiPO4(a), BiVO4(b) and P3(c)

Fig.6 Photocurrents of BiVO4, BiPO4 and P3 photoanodes

Fig.7 Photocatalytic degradation efficiency of RhB over different photocatalysts under visible-light irradiation(A) and cycling runs of P3(B) with initial concentration of RhB of 5 mg/L and catalyst loading of 0.5 g/L a. Blank; b. BiVO4; c. P1; d. P2; e. P3; f. P4; g. P5; h. O2-purged P3.

Fig.8 Photodegradation of RhB in the presence of P3 heterostructure and different scavengers

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Preparation of BiPO₄/BiVO₄ Composites with High Visible-light Photocatalytic Activity^†

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