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Synthesis of BiPO4/Bi2S3 Heterojunction with Enhanced Photocatalytic Activity under Visible-Light Irradiation.

Lu M, Yuan G, Wang Z, Wang Y, Guo J - Nanoscale Res Lett (2015)

Bottom Line: It was found that BiPO4 was regular rods with smooth surfaces.The enhanced photocatalytic performance could be ascribed to synergistic effect of BiPO4/Bi2S3 heterojunction, in which the attached Bi2S3 nanoparticles could improve visible-light absorption and the BiPO4/Bi2S3 heterojunction suppressed the recombination of photogenerated electron-hole pairs.Our work suggested that BiPO4/Bi2S3 heterojunction could be a potential photocatalyst under visible light.

View Article: PubMed Central - PubMed

Affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Soochow, 215123, China.

ABSTRACT
BiPO4/Bi2S3 photocatalysts were successfully synthesized by a simple two-step hydrothermal process, which involved the initial formation of BiPO4 rod and then the attachment of Bi2S3 through ion exchange. The as-synthesized products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance spectra (UV-vis DRS). It was found that BiPO4 was regular rods with smooth surfaces. However, BiPO4/Bi2S3 heterojunction had a rough surface, which could be attributed to the attachment of Bi2S3 on the surface of BiPO4 rods. The BiPO4/Bi2S3 composite exhibited better photocatalytic performance than that of pure BiPO4 and Bi2S3 for the degradation of methylene blue (MB) and Rhodamine B (RhB) under visible light. The enhanced photocatalytic performance could be ascribed to synergistic effect of BiPO4/Bi2S3 heterojunction, in which the attached Bi2S3 nanoparticles could improve visible-light absorption and the BiPO4/Bi2S3 heterojunction suppressed the recombination of photogenerated electron-hole pairs. Our work suggested that BiPO4/Bi2S3 heterojunction could be a potential photocatalyst under visible light.

No MeSH data available.


a UV-vis DRS of BiPO4, Bi2S3, and BiPO4/Bi2S3 composites and b the plotting of (αhν)n/2 vs. hν
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Fig5: a UV-vis DRS of BiPO4, Bi2S3, and BiPO4/Bi2S3 composites and b the plotting of (αhν)n/2 vs. hν

Mentions: Figure 5a shows UV-vis DRS of as-prepared BiPO4, Bi2S3, and BiPO4/Bi2S3 composites. It reveals that BiPO4/Bi2S3 composites have a stronger absorption than that of BiPO4 in visible light. The band gap energy can be achieved through the formula [30, 31]. Besides, according to the literature, n values of BiPO4 and Bi2S3 are 4 [32] and 1 [33], respectively. Therefore, as is shown in Fig. 5b, Eg of BiPO4 and Bi2S3 can be calculated as 4.08 and 1.30 eV. Moreover, Eg of BB-1, BB-2, and BB-3 are 4.01, 3.93, and 3.81 eV, respectively. Besides, Bi2S3 displays quantum size effect, which may influence the band gap, the position of both CB and VB band. Besides, the band gap shift relative to the bulk can be calculated by the following formula [34, 35]:Fig. 5


Synthesis of BiPO4/Bi2S3 Heterojunction with Enhanced Photocatalytic Activity under Visible-Light Irradiation.

Lu M, Yuan G, Wang Z, Wang Y, Guo J - Nanoscale Res Lett (2015)

a UV-vis DRS of BiPO4, Bi2S3, and BiPO4/Bi2S3 composites and b the plotting of (αhν)n/2 vs. hν
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4593991&req=5

Fig5: a UV-vis DRS of BiPO4, Bi2S3, and BiPO4/Bi2S3 composites and b the plotting of (αhν)n/2 vs. hν
Mentions: Figure 5a shows UV-vis DRS of as-prepared BiPO4, Bi2S3, and BiPO4/Bi2S3 composites. It reveals that BiPO4/Bi2S3 composites have a stronger absorption than that of BiPO4 in visible light. The band gap energy can be achieved through the formula [30, 31]. Besides, according to the literature, n values of BiPO4 and Bi2S3 are 4 [32] and 1 [33], respectively. Therefore, as is shown in Fig. 5b, Eg of BiPO4 and Bi2S3 can be calculated as 4.08 and 1.30 eV. Moreover, Eg of BB-1, BB-2, and BB-3 are 4.01, 3.93, and 3.81 eV, respectively. Besides, Bi2S3 displays quantum size effect, which may influence the band gap, the position of both CB and VB band. Besides, the band gap shift relative to the bulk can be calculated by the following formula [34, 35]:Fig. 5

Bottom Line: It was found that BiPO4 was regular rods with smooth surfaces.The enhanced photocatalytic performance could be ascribed to synergistic effect of BiPO4/Bi2S3 heterojunction, in which the attached Bi2S3 nanoparticles could improve visible-light absorption and the BiPO4/Bi2S3 heterojunction suppressed the recombination of photogenerated electron-hole pairs.Our work suggested that BiPO4/Bi2S3 heterojunction could be a potential photocatalyst under visible light.

View Article: PubMed Central - PubMed

Affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Soochow, 215123, China.

ABSTRACT
BiPO4/Bi2S3 photocatalysts were successfully synthesized by a simple two-step hydrothermal process, which involved the initial formation of BiPO4 rod and then the attachment of Bi2S3 through ion exchange. The as-synthesized products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance spectra (UV-vis DRS). It was found that BiPO4 was regular rods with smooth surfaces. However, BiPO4/Bi2S3 heterojunction had a rough surface, which could be attributed to the attachment of Bi2S3 on the surface of BiPO4 rods. The BiPO4/Bi2S3 composite exhibited better photocatalytic performance than that of pure BiPO4 and Bi2S3 for the degradation of methylene blue (MB) and Rhodamine B (RhB) under visible light. The enhanced photocatalytic performance could be ascribed to synergistic effect of BiPO4/Bi2S3 heterojunction, in which the attached Bi2S3 nanoparticles could improve visible-light absorption and the BiPO4/Bi2S3 heterojunction suppressed the recombination of photogenerated electron-hole pairs. Our work suggested that BiPO4/Bi2S3 heterojunction could be a potential photocatalyst under visible light.

No MeSH data available.