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首页> 外文期刊>Nanotechnology >Template-free synthesis of BiVO4 nanostructures: II. Relationship between various microstructures for monoclinic BiVO4 and their photocatalytic activity for the degradation of rhodamine B under visible light
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Template-free synthesis of BiVO4 nanostructures: II. Relationship between various microstructures for monoclinic BiVO4 and their photocatalytic activity for the degradation of rhodamine B under visible light

机译：BiVO4纳米结构的无模板合成：II。 BiVO4单斜晶系的各种微观结构与其在可见光下降解罗丹明B的光催化活性之间的关系

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The shape-controlled synthesis of nanostructured materials has opened up new possibilities to improve their physical and chemical properties. In this work, new types of monoclinic structured BiVO4 with complex morphologies, namely flowerlike, disclike, tubelike and platelike shapes, have been synthesized in a binary green solvent (water and ethanol) through controlling reaction conditions such as solvent, pH value, concentration of precursors and reaction temperature. The morphology of BiVO4 can transform from three-dimensional (3D) flowerlike superstructures and hexagonal-prismatic nanotubes to two-dimensional (2D) platelike and disclike structures. UV–vis absorption spectra show that all of the prepared nano- and microstructures can respond to visible light and the optical properties of BiVO4 samples are relevant to their structures. More importantly, the photocatalytic activities of various BiVO4 samples are strongly dependent on their morphology for the degradation of rhodamine B (RhB) under visible-light irradiation. The 2D (disclike and platelike) BiVO4 demonstrates better photocatalytic activity than 3D and bulk BiVO4. Among the nano- and microstructures, the nanoplate BiVO4 exhibit the highest photocatalytic activity for degradation of organic pollutants. Additionally, it is found that the different microstructure of BiVO4 leads to the different degradation route for organic compounds of RhB. The reasons for the differences in the photocatalytic behavior for these BiVO4 nanostructures are further discussed. The relationship between the microstructure and the photocatalytic activity for BiVO4 may give clues for the preparation of photocatalysts with high activity based on material morphology design. Moreover, the prepared 2D BiVO4 can be a good photocatalyst used in environmental pollution control.
机译：形状控制的纳米结构材料的合成为改善其物理和化学性质开辟了新的可能性。在这项工作中，通过控制溶剂，pH值，溶剂浓度等反应条件，在二元绿色溶剂（水和乙醇）中合成了具有复杂形态（如花状，盘状，管状和板状）的新型单斜结构BiVO4。前体和反应温度。 BiVO4的形态可以从三维（3D）花状超结构和六方棱柱形纳米管转变为二维（2D）板状和盘状结构。紫外可见吸收光谱表明，所有制备的纳米结构和微观结构都可以对可见光作出响应，BiVO4样品的光学性质与其结构有关。更重要的是，各种BiVO4样品的光催化活性在很大程度上取决于可见光照射下若丹明B（RhB）降解的形态。 2D（盘状和板状）BiVO4比3D和块状BiVO4具有更好的光催化活性。在纳米结构和微观结构中，BiVO4纳米板对有机污染物的降解表现出最高的光催化活性。另外，发现BiVO4的不同微观结构导致RhB的有机化合物的不同降解途径。进一步讨论了这些BiVO4纳米结构的光催化行为差异的原因。 BiVO4的微观结构与光催化活性之间的关系可能为基于材料形态设计制备高活性光催化剂提供线索。此外，所制备的二维BiVO4可以作为控制环境污染的良好光催化剂。

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