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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.


Schematic illustration of possible electrons and hole transfer mechanism of BiPO4/Bi2S3 heterostructure
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Fig7: Schematic illustration of possible electrons and hole transfer mechanism of BiPO4/Bi2S3 heterostructure

Mentions: The band positions of BiPO4 and Bi2S3 are evaluated based on the equation [38]. Hence, the valence band and conduction band edge potential (EVB and ECB) of BiPO4 and Bi2S3 are 4.39 eV, 0.31 eV and 1.43 eV, 0.13 eV, respectively. Therefore, the possible mechanism is shown in Fig. 7. Bi2S3 nanoparticles absorb the visible light and give rise to electron-hole pairs. The photo-excited electrons in Bi2S3 CB will transfer to BiPO4 rods and holes are left in Bi2S3 VB, which will decrease recombination rate of photogenerated charge carriers. The electrons in BiPO4 CB can rapidly adsorb O2 to form O2−•, while the holes can interact with the absorbed H2O to achieve hydroxyl radicals. After then, O2−• and OH• with strong oxidizability can decompose MB (RhB) to generate CO2 and H2O. Moreover, BiPO4/Bi2S3 heterojunction photocatalysts have a stronger and wider absorption in visible light, which is beneficial to photocatalytic activity.Fig. 7


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)

Schematic illustration of possible electrons and hole transfer mechanism of BiPO4/Bi2S3 heterostructure
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig7: Schematic illustration of possible electrons and hole transfer mechanism of BiPO4/Bi2S3 heterostructure
Mentions: The band positions of BiPO4 and Bi2S3 are evaluated based on the equation [38]. Hence, the valence band and conduction band edge potential (EVB and ECB) of BiPO4 and Bi2S3 are 4.39 eV, 0.31 eV and 1.43 eV, 0.13 eV, respectively. Therefore, the possible mechanism is shown in Fig. 7. Bi2S3 nanoparticles absorb the visible light and give rise to electron-hole pairs. The photo-excited electrons in Bi2S3 CB will transfer to BiPO4 rods and holes are left in Bi2S3 VB, which will decrease recombination rate of photogenerated charge carriers. The electrons in BiPO4 CB can rapidly adsorb O2 to form O2−•, while the holes can interact with the absorbed H2O to achieve hydroxyl radicals. After then, O2−• and OH• with strong oxidizability can decompose MB (RhB) to generate CO2 and H2O. Moreover, BiPO4/Bi2S3 heterojunction photocatalysts have a stronger and wider absorption in visible light, which is beneficial to photocatalytic activity.Fig. 7

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.