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首页> 外文期刊>RSC Advances >Novel magnetically separable ZnO/AgBr/Fe3O4/Ag3VO4 nanocomposites with tandem n-n heterojunctions as highly efficient visible-light-driven photocatalysts
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Novel magnetically separable ZnO/AgBr/Fe3O4/Ag3VO4 nanocomposites with tandem n-n heterojunctions as highly efficient visible-light-driven photocatalysts

机译：具有串联N-N异质条件的新型磁性可分离的ZnO / AgBr / Fe3O4 / Ag3VO4纳米复合材料作为高效的可见光触发光催化剂

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摘要

In the present work, novel magnetically separable ZnO/AgBr/Fe3O4/Ag3VO4 nanocomposites with different weight percentages of Ag3VO4 were successfully prepared. The preparation method is a facile large-scale method with a low temperature of 96 degrees C. Characterization techniques of XRD, EDX, SEM, TEM, UV-vis DRS, FT-IR, PL, and VSM were applied to study the microstructure, purity, morphology, spectroscopic, and magnetic properties of the resultant samples. Photocatalytic activity was evaluated by degradation of rhodamine B under visible-light irradiation. The results indicated that the nanocomposite with 10% Ag3VO4 has the best activity. The photocatalytic activity of this nanocomposite is about 2.8 and 3.5-fold higher than those of the ZnO/AgBr/Fe3O4 and ZnO/Ag3VO4/Fe3O4 nanocomposites, respectively. The highly enhanced activity was attributed to the formation of tandem n-n heterojunctions between ZnO, AgBr, and Ag3VO4 which suppresses recombination of the photogenerated electron-hole pairs. Furthermore, the enhanced activity of the nanocomposite for degradation of two more dye pollutants and a colorless pollutant was confirmed. Finally, the magnetic photocatalyst was recycled using an external magnetic field with reasonable activity after four runs.
机译：在本作工作中，成功制备了具有不同重量百分比的磁性可分离的ZnO / AgBr / Fe3O4 / Ag3VO4纳米复合材料。制备方法是具有96摄氏度的低温的容易大规模方法。XRD，EDX，SEM，TEM，UV-VIS，FT-IR，PL和VSM的表征技术被应用于研究微观结构，纯度，形态，光谱和所得样品的磁性。通过在可见光照射下通过罗丹明B降解光催化活性。结果表明，具有10％Ag3VO4的纳米复合材料具有最佳活性。该纳米复合材料的光催化活性分别高于ZnO / Agbr / Fe3O4和ZnO / Ag3VO4 / Fe3O4纳米复合材料的约2.8和3.5倍。高增强的活性归因于ZnO，AgBR和Ag3VO4之间的串联N-N杂交疾病，其抑制了光发生的电子孔对的重组。此外，证实了纳米复合材料的增强活性进行两种染料污染物和无色污染物的降解。最后，使用外部磁场再循环磁性光催化剂在四次运行后具有合理活性的外部磁场。

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