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Visible-light photocatalytic performance, recovery and degradation mechanism of ternary magnetic Fe3O4/BiOBr/BiOI composite.


ABSTRACT: The ternary magnetic Fe3O4/BiOBr/BiOI (x : 3 : 1) photocatalysts were successfully synthesized by a facile solvothermal method. The samples were characterized by XRD, SEM, EDS, ICP-AES, XPS, UV-vis DRS, PL and VSM. Nitrogen-containing dye RhB was used as a degradation substrate to evaluate the photocatalytic degradation activities of the samples. The photocatalytic performance of Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) is superior to other Fe3O4/BiOBr/BiOI (x : 3 : 1). Compared with binary magnetic Fe3O4/BiOBr (0.5 : 1) prepared in our previous work, the Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) has obvious advantages in photocatalytic activity and adsorption capacity. And the specific surface area (48.30 m2 g-1) is much larger than that of the previous report (Fe3O4/BiOBr/BiOI (0.5 : 2 : 2)) synthesized by a co-precipitation method. Besides, after 25 s of magnetic field, Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) can be rapidly separated from water. After eight recycling cycles, the magnetic properties, photocatalytic activity, crystallization and morphology of the Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) catalyst remain good. The possible photocatalytic degradation mechanism of RhB under Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) photocatalyst was also proposed. The results indicate that the ternary magnetic Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) composite with high photocatalytic degradation efficiency, good magnetic separation performance and excellent recyclability and stability has potential application prospect in wastewater.

SUBMITTER: Li J 

PROVIDER: S-EPMC9073387 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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Visible-light photocatalytic performance, recovery and degradation mechanism of ternary magnetic Fe<sub>3</sub>O<sub>4</sub>/BiOBr/BiOI composite.

Li Jianhui J   Yang Fan F   Zhou Quan Q   Wu Lijie L   Li Wenying W   Ren Ruipeng R   Lv Yongkang Y  

RSC advances 20190730 41


The ternary magnetic Fe<sub>3</sub>O<sub>4</sub>/BiOBr/BiOI (<i>x</i> : 3 : 1) photocatalysts were successfully synthesized by a facile solvothermal method. The samples were characterized by XRD, SEM, EDS, ICP-AES, XPS, UV-vis DRS, PL and VSM. Nitrogen-containing dye RhB was used as a degradation substrate to evaluate the photocatalytic degradation activities of the samples. The photocatalytic performance of Fe<sub>3</sub>O<sub>4</sub>/BiOBr/BiOI (0.4 : 3 : 1) is superior to other Fe<sub>3</sub>  ...[more]

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