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首页> 外文期刊>Nanotechnology >Direct Z-scheme FeVO4/BiOCl heterojunction as a highly efficient visible-light-driven photocatalyst for photocatalytic dye degradation and Cr(VI) reduction
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Direct Z-scheme FeVO4/BiOCl heterojunction as a highly efficient visible-light-driven photocatalyst for photocatalytic dye degradation and Cr(VI) reduction

机译：直接Z-Scheme Fevo4 / Biocl异质结作为光催化染料降解和Cr（VI）减少的高效可见光触发光催化剂

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摘要

In this work, potential applications of a direct Z-scheme FeVO4/BiOCl heterojunction for photocatalytic degradation of organic dyes (methylene blue, MB and rhodamine B, RhB) and reduction of hexavalent chromium (Cr(VI)) ion under visible light irradiation were reported. Firstly, FeVO4 and BiOCl were synthesized by using a microwave heating method. Then, the FeVO4/BiOCl nanocomposites with different weight percentages of FeVO4 (1, 3, 6.25, 12.5 and 25%wt) were fabricated by a method of modified wet impregnation. The photocatalytic degradation activities of the nanocomposites were investigated in parallel with pure BiOCl and FeVO4. Among the as-prepared nanocomposites, the FeVO4/BiOCl nanocomposite with 6.25%wt of FeVO4 exhibited the highest photocatalytic dye degradation efficiency; 99.8% of RhB was degraded after being irradiated for 360 min, while 87.2% of MB was degraded. Similarly, this nanocomposite photocatalytically reduced 97.8% of Cr(VI) at a pH value of 3. The superior photocatalytic activity can be ascribed to the effective visible light absorption of the FeVO4/BiOCl heterojunction and the suppression of the recombination process of photogenerated electron-hole pairs. Additionally, the improved charge migration and separation efficiencies between FeVO4 and BiOCl through the direct Z-scheme charge transfer pathway are involved, as evidenced by the trapping experiments, and the UV-visible diffuse reflectance (UV-vis DRS), photoluminescence spectroscopy (PL) and electrochemical impedance spectroscopy analyses. Photocatalytic mechanisms of the direct Z-scheme FeVO4/BiOCl heterojunction for the photodegradation of RhB and photoreduction of Cr(VI) have been proposed and discussed in greater detail.
机译：在这项工作中，直接Z形方案FeVO4 / BioCl异质结的潜在应用用于有机染料（亚甲基蓝，MB和罗丹明B，RHB）的光催化降解和六价铬（Cr（vi））离子的可见光辐照下报道。首先，通过使用微波加热方法合成FeVO4和BioCl。然后，通过改性湿浸渍的方法制造具有不同重量百分比的FeVO4（1,3,6.25,12.5和25％wt）的FeVO4 / BioCl纳米复合材料。用纯BioCl和Fevo4并联研究纳米复合材料的光催化降解活性。在制备的纳米复合材料中，具有6.25％WT的FEVO4的FEVO4 / BioCl纳米复合材料表现出最高的光催化染料降解效率;在照射360分钟后，99.8％的RHB降解，而87.2％的MB降解。类似地，该纳米复合材料在pH值为3的pH值下光催化降低了97.8％Cr（VI）的Cr（VI）。优异的光催化活性可以归因于FEVO4 / BioCl异质结的有效可见光吸收和抑制光生电子的复合过程 - 孔对。另外，通过直接Z方案电荷转移途径涉及FEVO4和BioCl之间的改善的电荷迁移和分离效率，如捕获实验证明，以及UV可见漫反射率（UV-VIS DRS），光致发光光谱（PL ）和电化学阻抗光谱分析。提出并更详细地提出了用于RHB的光降解和CR（VI）光降解的光催化机制，并更详细地讨论了CR（VI）的光降解。

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