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首页> 美国卫生研究院文献>Nanomaterials >Magnetic Photocatalyst BiVO4/Mn-Zn ferrite/Reduced Graphene Oxide: Synthesis Strategy and Its Highly Photocatalytic Activity
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Magnetic Photocatalyst BiVO4/Mn-Zn ferrite/Reduced Graphene Oxide: Synthesis Strategy and Its Highly Photocatalytic Activity

机译：磁性光催化剂BiVO4 / Mn-Zn铁氧体/氧化石墨烯的合成策略及其高光催化活性

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摘要

Magnetic photocatalyst BiVO4/Mn-Zn ferrite (Mn1−xZnxFe2O4)/reduced graphene oxide (RGO) was synthesized by a simple calcination and reduction method. The magnetic photocatalyst held high visible light-absorption ability with low band gap energy and wide absorption wavelength range. Electrochemical impedance spectroscopies illustrated good electrical conductivity which indicated low charge-transfer resistance due to incorporation of Mn1−xZnxFe2O4 and RGO. The test of photocatalytic activity showed that the degradation ratio of rhodamine B (RhB) reached 96.0% under visible light irradiation after only 1.5 h reaction. The photocatalytic mechanism for the prepared photocatalyst was explained in detail. Here, the incorporation of RGO enhanced the specific surface area compared with BiVO4/Mn1−xZnxFe2O4.The larger specific surface area provided more active surface sites, more free space to improve the mobility of photo-induced electrons, and further facilitated the effective migration of charge carriers, leading to the remarkable improvement of photocatalytic performance. Meanwhile, RGO was the effective acceptor as well as transporter of photo-generated electron hole pairs. •O2− was the most active species in the photocatalytic reaction. BiVO4/Mn1−xZnxFe2O4/RGO had quite a wide application in organic contaminants removal or environmental pollution control.
机译：通过简单的煅烧和还原方法合成了磁性光催化剂BiVO4 / Mn-Zn铁氧体（Mn1-xZnxFe2O4）/还原氧化石墨烯（RGO）。磁性光催化剂具有高的可见光吸收能力，低的带隙能量和宽的吸收波长范围。电化学阻抗谱显示出良好的电导率，这表明由于结合了Mn1-xZnxFe2O4和RGO，电荷转移电阻低。光催化活性测试表明，若在仅1.5 h的可见光照射下，若丹明B（RhB）的降解率达到96.0％。详细说明了制备的光催化剂的光催化机理。在此，与BiVO4 / Mn1-xZnxFe2O4相比，RGO的引入增加了比表面积，更大的比表面积提供了更多的活性表面位点，更多的自由空间以提高光生电子的迁移率，并进一步促进了有效的电子迁移。电荷载体，导致光催化性能的显着提高。同时，RGO是光生电子空穴对的有效受体和转运体。 •O2 -是光催化反应中活性最高的物质。 BiVO4 / Mn1-xZn x Fe 2 O 4 / RGO在有机污染物去除或环境污染控制中具有广泛的应用。

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