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Novel recyclable BiOBr/Fe3O4/RGO composites with remarkable visible-light photocatalytic activity.

ABSTRACT: Magnetic BiOBr/Fe3O4/RGO composites with remarkable photocatalytic capability were prepared by a simple hydrothermal method to load 3D flower-like microspherical BiOBr onto the surface of Fe3O4/RGO. Under visible-light irradiation (λ > 420 nm), the BiOBr/Fe3O4/RGO composite with 56% mass percentage of Fe3O4/RGO shows the optimal removal ability for Rhodamine B, and the total removal efficiency is 96%. The coupling of Fe3O4/RGO and BiOBr elevates the conduction band of BiOBr, which enhances the reduction level of BiOBr/Fe3O4/RGO composites. Ultimately, based on experiments and theoretical calculations, an n-type Schottky contact formed at the heterojunction interface between RGO doped with Fe3O4 and BiOBr is proposed for photoexcited charge transfer. The RGO with great adsorptivity plays a major role in the photocatalysts composed of BiOBr, RGO and Fe3O4. Further, BiOBr/Fe3O4/RGO composites with permanent-magnetism can be recovered and reused easily by external magnetic field and maintain a total removal efficiency of 90% after four cycles.

SUBMITTER: Zheng M 

PROVIDER: S-EPMC9054123 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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Novel recyclable BiOBr/Fe<sub>3</sub>O<sub>4</sub>/RGO composites with remarkable visible-light photocatalytic activity.

Zheng Mingkun M   Ma Xinguo X   Hu Jisong J   Zhang Xinxin X   Li Di D   Duan Wangyang W  

RSC advances 20200527 34

Magnetic BiOBr/Fe<sub>3</sub>O<sub>4</sub>/RGO composites with remarkable photocatalytic capability were prepared by a simple hydrothermal method to load 3D flower-like microspherical BiOBr onto the surface of Fe<sub>3</sub>O<sub>4</sub>/RGO. Under visible-light irradiation (<i>λ</i> > 420 nm), the BiOBr/Fe<sub>3</sub>O<sub>4</sub>/RGO composite with 56% mass percentage of Fe<sub>3</sub>O<sub>4</sub>/RGO shows the optimal removal ability for Rhodamine B, and the total removal efficiency is 96%.  ...[more]

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