Effects of F- on the Growth and Photocatalytic Activity of C-doped Nb2O5 Nanocrystals†

doi:10.7503/cjcu20131249

Abstract

Abstract:

C and F co-doped Nb₂O₅ photocatalysts were prepared by introducing F^- ions to C-doped Nb₂O₅. The effects of F^- ions on the growth and photocatalytic activity of Nb₂O₅ nanocrystals were studied. The synthesized samples were characterized by XRD, SEM, TEM, N₂ adsorption-desorption, XPS, UV-Vis and photodegradation of RhB. The experimental results indicate that the F^- ions can promote the growth of Nb₂O₅ nanocrystals, especially along the direction of [001]. The results also show that the F^- ions are not incorporated into the lattice of Nb₂O₅ by occupying the O atoms, but physically adsorbed on the surface of Nb₂O₅ nanocrystals. The fluorination over the surface of C-doped Nb₂O₅ can enhance the generation of free ·OH radicals thus accelerate the photocatalytic reaction.

Key words: F- ion, C-doped Nb2O5, Visible light, Photocatalysis

CLC Number:

O614
O643

TrendMD:

DING Shuang, WANG Runwei, ZHANG Zongtao, QIU Shilun. Effects of F^- on the Growth and Photocatalytic Activity of C-doped Nb₂O₅ Nanocrystals^†[J]. Chem. J. Chinese Universities, 2014, 35(4): 695.

Figures/Tables 10

Fig.1 XRD patterns of various samples a. C-Nb2O5; b. C,F-Nb2O5-0.05; c. C,F-Nb2O5-0.1; d. C,F-Nb2O5-0.2; e. C,F-Nb2O5-0.3; f. C,F-Nb2O5-0.4; g. C,F-Nb2O5-0.5.

Fig.2 SEM images of C-Nb2O5(A), C,F-Nb2O5-0.1(B), C,F-Nb2O5-0.3(C) and C,F-Nb2O5-0.5(D)

Fig.3 TEM(A), HRTEM(B) and SAED(C) images of the sample C,F-Nb2O5-0.5

Fig.4 N2 adsorption-desorption isotherms of C-Nb2O5(A), C,F-Nb2O5-0.1(B), C,F-Nb2O5-0.3(C) and C,F-Nb2O5-0.5(D)

Fig.5 Pore size distribution of C-Nb2O5(a), C,F-Nb2O5-0.1(b), C,F-Nb2O5-0.3(c) and C,F-Nb2O5-0.5(d)

Table 1 Textual parameters of various samples prepared using different amount of HF*

Sample	S_BET/(m²·g^-1)	Total-C(%, atom fraction)	Site-C(%, atom fraction)	Fluorination-F(%, atom fraction)
C-Nb₂O₅	344.0	8.27	2.21	0
C,F-Nb₂O₅-0.1	237.3	6.34	1.82	2.01
C,F-Nb₂O₅-0.3	200.7	6.29	1.76	3.53
C,F-Nb₂O₅-0.5	58.8	3.69	1.03	4.95

Fig.6 XPS spectra survey of C-Nb2O5(a), C,F-Nb2O5-0.1(b), C,F-Nb2O5-0.3(c) and C,F-Nb2O5-0.5(d)

Fig.7 High resolution XPS of C1s(A) and F1s(B) for C-Nb2O5(a), C,F-Nb2O5-0.1(b), C,F-Nb2O5-0.3(c) and C,F-Nb2O5-0.5(d)

Fig.8 UV-Vis absorption spectra of the samples C-Nb2O5(a), C,F-Nb2O5-0.1(b) and C,F-Nb2O5-0.3(c)

Fig.9 Photcatalytic degradation of RhB a. No catalyst; b. Nb2O5; c. P25; d. C,F-Nb2O5-0.5; e. C,F-Nb2O5-0.3; f. C-Nb2O5; g. C,F-Nb2O5-0.1.

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Effects of F^- on the Growth and Photocatalytic Activity of C-doped Nb₂O₅ Nanocrystals^†

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