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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 Photodegradation rate of MB under visible-light irradiation with different samples, b photodegradation rate of RhB under visible-light irradiation with different samples
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Fig6: a Photodegradation rate of MB under visible-light irradiation with different samples, b photodegradation rate of RhB under visible-light irradiation with different samples

Mentions: The photocatalytic performance of BiPO4/Bi2S3 heterojunction was assessed by photodegradation of MB under visible-light irradiation (Fig. 6a). It can be seen that pure BiPO4 shows poor photocatalytic ability in degrading MB (40 %). Interestingly, the coupling of BiPO4 with Bi2S3 leads to notable enhancement MB photodegradation. The MB removal rates are about 50, 80, and 60 %, respectively. Meantime, RhB here is also employed as an organic pollutant to further confirm the photodegradation activity of BiPO4/Bi2S3 heterojunction. As shown in Fig. 6b, BiPO4/Bi2S3 composites show better photocatalytic activity in the degradation of RhB than that of pure BiPO4 and the best photocatalytic property was achieved for BB-2 sample. The enhanced visible-light-driven activity of the heterostructure must be attributed to the synergistic effect between BiPO4 and Bi2S3. What is more, the quantum size confinement of Bi2S3 in the visible spectrum also leads to the enhancement of photocatalytic activity. However, the excess Bi2S3 content in BiPO4/Bi2S3 composite will cause their photocatalytic performance to decrease (BB-3). It may be attributed to these reasons: one is reduction of active sites due to the excess Bi2S3 nanoparticles on the surface BiPO4 rod [36]. The other is that excessive narrow band gap Bi2S3 may lower the separation efficiency of electron-hole pairs and further inhibit the photocatalytic activity [37].Fig. 6


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 Photodegradation rate of MB under visible-light irradiation with different samples, b photodegradation rate of RhB under visible-light irradiation with different samples
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig6: a Photodegradation rate of MB under visible-light irradiation with different samples, b photodegradation rate of RhB under visible-light irradiation with different samples
Mentions: The photocatalytic performance of BiPO4/Bi2S3 heterojunction was assessed by photodegradation of MB under visible-light irradiation (Fig. 6a). It can be seen that pure BiPO4 shows poor photocatalytic ability in degrading MB (40 %). Interestingly, the coupling of BiPO4 with Bi2S3 leads to notable enhancement MB photodegradation. The MB removal rates are about 50, 80, and 60 %, respectively. Meantime, RhB here is also employed as an organic pollutant to further confirm the photodegradation activity of BiPO4/Bi2S3 heterojunction. As shown in Fig. 6b, BiPO4/Bi2S3 composites show better photocatalytic activity in the degradation of RhB than that of pure BiPO4 and the best photocatalytic property was achieved for BB-2 sample. The enhanced visible-light-driven activity of the heterostructure must be attributed to the synergistic effect between BiPO4 and Bi2S3. What is more, the quantum size confinement of Bi2S3 in the visible spectrum also leads to the enhancement of photocatalytic activity. However, the excess Bi2S3 content in BiPO4/Bi2S3 composite will cause their photocatalytic performance to decrease (BB-3). It may be attributed to these reasons: one is reduction of active sites due to the excess Bi2S3 nanoparticles on the surface BiPO4 rod [36]. The other is that excessive narrow band gap Bi2S3 may lower the separation efficiency of electron-hole pairs and further inhibit the photocatalytic activity [37].Fig. 6

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.