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首页> 外文期刊>RSC Advances >Plasmonic Z-scheme alpha/beta-Bi2O3-Ag-AgCl photocatalyst with enhanced visible-light photocatalytic performance
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Plasmonic Z-scheme alpha/beta-Bi2O3-Ag-AgCl photocatalyst with enhanced visible-light photocatalytic performance

机译：具有增强的可见光光催化性能的等离子Z方案α/β-Bi2O3-Ag-AgCl光催化剂

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Environmental treatment over bismuth based catalysts due to their appropriate band structure and abundance is a promising process. However, the practical application of single-phase bismuth based catalysts is hindered by serious charge transport limitations. The plasmonic Z-scheme alpha/beta-Bi2O3-Ag-AgCl photocatalysts resolving the drawbacks of single-component photocatalysts have been successfully synthesized by anchoring Ag-AgCl nanocrystals on the surfaces of alpha/beta-Bi2O3 nanowire heterojunctions via the deposition-precipitation method assisted by the photo-reduction process. The as-prepared samples were characterized by a series of techniques, such as X-ray diffraction (XRD), electron microscopy (EM), Brunauer-Emmett-Teller analysis (BET), and UV-vis diffuse reflectance absorption spectra (UV-vis). The effects of the amount and the photo-reduction time of Ag-AgCl nanocrystals on the photocatalytic performance for the alpha/beta-Bi2O3-Ag-AgCl composites were systematically investigated. Inspiringly, the plasmonic alpha/beta-Bi2O3-Ag-10wt% AgCl-30 composites exhibit superior photocatalytic performance compared to alpha/beta-Bi2O3 nanowires for the degradation of Rhodamine B and acid orange 7 dyes due to the effective charge transfer between Ag-AgCl nanocrystals and alpha/beta-Bi2O3 nanowires. On the basis of photocatalytic activity and band structure analysis, a plasmonic Z-scheme photocatalytic mechanism is proposed; namely, two-step visible-light absorption is caused by the localized surface plasmon resonance of metallic Ag nanocrystals and the band gap photoexcitation of alpha/beta-Bi2O3. This work could provide new insights into the fabrication of plasmonic Z-scheme photocatalysts with high performance and facilitate their practical application in environmental remediation issues.
机译：由于其合适的能带结构和丰度，在铋基催化剂上进行环境处理是一个有前途的过程。但是，单相铋基催化剂的实际应用受到严重的电荷传输限制的阻碍。通过沉积沉淀法将Ag-AgCl纳米晶体锚定在α/β-Bi2O3纳米线异质结的表面上，已成功合成了解决单组分光催化剂缺点的等离子Z方案α/β-Bi2O3-Ag-AgCl光催化剂。借助光还原过程。所制备的样品通过一系列技术进行表征，例如X射线衍射（XRD），电子显微镜（EM），Brunauer-Emmett-Teller分析（BET）和UV-vis漫反射吸收光谱（UV-可见）。系统研究了Ag-AgCl纳米晶体的数量和光还原时间对α/β-Bi2O3-Ag-AgCl复合材料光催化性能的影响。令人鼓舞的是，由于α-/β-Bi2O3-Ag-10wt％AgCl-30复合物在Ag-和β-Bi2O3纳米线之间进行了有效的电荷转移，因此与α/β-Bi2O3纳米线相比，在罗丹明B和酸性橙7染料的降解方面表现出优异的光催化性能。 AgCl纳米晶体和α/β-Bi2O3纳米线。在光催化活性和能带结构分析的基础上，提出了等离子体Z-方案的光催化机理。即，两步可见光吸收是由金属Ag纳米晶体的局部表面等离子体激元共振和α/β-Bi2O3的带隙光激发引起的。这项工作可以为高性能的等离激元Z型光催化剂的制备提供新的见解，并促进它们在环境修复问题中的实际应用。

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