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首页> 外文期刊>Nanotechnology >Hierarchically porous metastable β-Ag_2WO_4 hollow nanospheres: Controlled synthesis and high photocatalytic activity
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Hierarchically porous metastable β-Ag_2WO_4 hollow nanospheres: Controlled synthesis and high photocatalytic activity

机译：分层多孔亚稳态β-Ag_2WO_4空心纳米球：受控合成和高光催化活性

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摘要

Metastable materials have received extensive attention due to their unique physical and chemical properties which are different from those of the thermodynamically stable phase. However, the variety of reported metastable materials is still very limited owing to difficulties in the effective synthesis of pure metastable materials because they can easily transform into the corresponding stable phases. Therefore, it is crucial and a great challenge to explore new metastable materials with novel and fascinating functions. In this study, hierarchically porous metastable β-Ag_2WO_4 hollow nanospheres with a diameter of 50-500 nm were prepared for the first time by a facile precipitation reaction between AgNO3 and Na _2WO_4 in the presence of poly(methacrylic acid) (PMAA). It was found that the PMAA not only provided a spherical soft template to induce the formation of hollow nanospheres but also worked as an inhibitor to prevent the phase transformation from thermodynamically unstable β-Ag _2WO_4 to stable -Ag_2WO_4 phase. The resultant metastable β-Ag_2WO_4 hollow nanospheres show a larger specific surface area (165.5 m~2 g~(-1)) owing to the hierarchically porous structure (micropores, mesopores, and macropores), resulting in a high photocatalytic performance for the decomposition of methyl orange and phenol aqueous solutions. The present work can provide some new insight into the smart design and preparation of other new metastable hollow materials, and the prepared metastable β-Ag_2WO_4 hollow nanospheres have various potential applications in chemical reactors, drug-delivery carriers, solar cells, catalysis, and separation and purification fields.
机译：亚稳态材料因其独特的物理和化学特性而不同于热力学稳定相，因而受到了广泛的关注。然而，由于难以有效地合成纯亚稳态材料，所报道的亚稳态材料的种类仍然非常有限，因为它们很容易转变成相应的稳定相。因此，探索具有新颖而引人入胜的功能的新型亚稳材料是至关重要的，也是巨大的挑战。在这项研究中，通过在聚（甲基丙烯酸）（PMAA）存在下，AgNO3和Na _2WO_4之间的快速沉淀反应，首次制备了直径为50-500 nm的分层多孔的亚稳态β-Ag_2WO_4空心纳米球。发现PMAA不仅提供了球形的软模板以诱导中空纳米球的形成，而且还起到了阻止从热力学上不稳定的β-Ag_2WO_4到稳定的-Ag_2WO_4相转变的抑制剂的作用。由于分级的多孔结构（微孔，中孔和大孔），所得的亚稳态β-Ag_2WO_4空心纳米球显示出较大的比表面积（165.5 m〜2 g〜（-1）），从而具有较高的光催化分解性能。甲基橙和苯酚水溶液。目前的工作可以为其他新型亚稳空心材料的智能设计和制备提供一些新的见识，并且制备的亚稳β-Ag_2WO_4空心纳米球在化学反应器，药物输送载体，太阳能电池，催化和分离方面具有多种潜在应用。和净化领域。

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