In-situ Synthesis of BiOCl/NaBiO3 Composites and Their Photocatalytic Activities†

doi:10.7503/cjcu20140694

Abstract

Abstract:

BiOCl/NaBiO₃ composite photocatalytic materials were in-situ synthesized through the reaction of NaBiO₃ and HCl. The phase structures, surface morphologies and optical properties of the samples were studied by X-ray powder diffraction(XRD), scanning electron microscope(SEM) and UV-Vis diffuse reflectance spectra(UV-Vis DRS), respectively. The photocatalytic activities of the samples were evaluated by degradation of rhodamine B(RhB) under visible and ultraviolet light, respectively. Under visible light the 27.4%(molar fraction) BiOCl/NaBiO₃ shows higher photocatalytic activity than the pure BiOCl and NaBiO₃; under ultraviolet light all the BiOCl/NaBiO₃ composites show higher photocatalytic activities than pure BiOCl and NaBiO₃. The results indicate that the composition of BiOCl and NaBiO₃ can form heterojunction region, and then influence the transfer behavior of photogenerated carriers. The photocatalysis experiments with different trapping agents and terephthalic acid photoluminescence(TA-PL) suggest that ·OH played major role for RhB degradation. A possible mechanism involving charge separation process between BiOCl and NaBiO₃ was proposed. The n-p type heterojunction at the interface between p-BiOCl and n-NaBiO₃ can efficiently reduce the recombination of photogenerated electron-hole pairs, which accounts for the enhancement of photocatalytic activity. From the analysis of potential, it is theoretically deduced that the photocatalytic degradation of RhB could be attributed to the ·OH and hole rather than · $O 2 -$ radicals.

Key words: Photocatalysis, BiOCl, NaBiO3, Composite, Mechanism

CLC Number:

O643.31

TrendMD:

JI Lei, YU Ruimin, WANG Haoren, CHEN Liduo, WANG Huaiyuan. In-situ Synthesis of BiOCl/NaBiO₃ Composites and Their Photocatalytic Activities^†[J]. Chem. J. Chinese Universities, 2015, 36(3): 551.

Figures/Tables 8

Fig.1 XRD patterns of the samples a. NaBiO3; b. 12.1%BiOCl/NaBiO3; c. 27.4%BiOCl/NaBiO3; d. 47.6%BiOCl/NaBiO3; e. 60.4%BiOCl/NaBiO3; f. 75.5%BiOCl/NaBiO3; g. BiOCl.

Fig.2 SEM images of the samples (A) NaBiO3; (B) 27.4%BiOCl/NaBiO3; (C) 47.6%BiOCl/NaBiO3; (D) BiOCl.

Fig.3 UV-Vis diffuse reflectance spectra(A) and (αhν)1/2-hν curves(B) of different samples a. NaBiO3; b. 12.1%BiOCl/NaBiO3; c. 27.4%BiOCl/NaBiO3; d. 47.6%BiOCl/NaBiO3; e. 60.4%BiOCl/NaBiO3;f. 75.5%BiOCl/NaBiO3; g. BiOCl.

Fig.4 Photocatalytic degradation of RhB over different samples under visible light irradiation(A) and kapp of different samples(B)

Fig.5 Photocatalytic degradation of RhB over different samples under UV light irradiation(A) and kapp of different samples(B)

Fig.6 Influence of different quenchers on kapp values under visible light irradiation(A) and UV light irradiation(B)

Fig.7 ·OH trapping PL spectra changes of different samples observed during visible light irradiation(A) and UV light irradiation(B) (A) a. 27.4%BiOCl/NaBiO3; b. 12.1%BiOCl/NaBiO3; c. NaBiO3; d. 47.6%BiOCl/NaBiO3; e. 60.4%BiOCl/NaBiO3; f. 75.5%BiOCl/NaBiO3; g. BiOCl. (B) a. 47.6%%BiOCl/NaBiO3; b. 27.4%BiOCl/NaBiO3; c. 12.1%BiOCl/NaBiO3; d. 60.4%BiOCl/NaBiO3; e. 75.5%BiOCl/NaBiO3; f. BiOCl; g. NaBiO3.

Fig.8 Diagram of the proposed charge separation process of BiOCl/NaBiO3 composites under light irradiation

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In-situ Synthesis of BiOCl/NaBiO₃ Composites and Their Photocatalytic Activities^†

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