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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Enhanced visible-light photocatalytic activity of Bi2MoO6 nanoplates with heterogeneous Bi2MoO6-x@Bi2MoO6 core-shell structure
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Enhanced visible-light photocatalytic activity of Bi2MoO6 nanoplates with heterogeneous Bi2MoO6-x@Bi2MoO6 core-shell structure

机译：增强Bi2Moo6纳米板的可见光光催化活性，具有异质Bi2moo6-X @ Bi2moo6核心壳结构

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摘要

A series of Bi2MoO6 (BMO) nanoplates with a heterogeneous Bi2MoO6-x@Bi2MoO6 core/shell structure were successfully obtained by reduction with CaH2 at 140 degrees C and subsequent reoxidation in air under low temperatures (= 250 degrees C). It is found that the oxygen vacancies mainly exist in the core, while the shell is formed by surface disorder layer with few oxygen vacancies, which is almost stoichiometric. The controllable growth of the surface disorder layer can be realized by the reduction and/or reoxidation temperatures. The reoxidized BMO with the surface disorder layer exhibits about five times higher visible-light photocatalytic activity toward phenol degradation and an order of magnitude higher activity toward methylene blue (MB) degradation than those of the unmodified sample. The visible-light absorption is mainly dominated by the oxygen vacancies through the modulation of the band gap structure, which promote the solar light utilization and photogenerated charge carriers. Density functional theory calculation shows that BMO is a direct band gap semiconductor. It is suggested that the surface disorder layer could suppress the direct recombination of photogenerated carriers and improve surface reactivity, and results in the enhancement of the photocatalytic activity. In addition, the existence of the stoichiometric surface disorder can promote the catalyst stability. It is demonstrated that the reduction- reoxidation method applied here is simple, easily control, and beneficial for the design and realization of heterogeneous core-shell nanostructured photocatalysts to improve visible and infrared optical absorption by engineering the surface disorder and the oxygen vacancies inside core of Bi2MoO6 nanoplates and the related nanostructured photocatalysts.
机译：通过在140℃下用CaH 2在140℃下还原，通过在140℃下降低，通过在低温下的空气中的再氧化，成功获得了一系列Bi2Moo6（BMO）纳米层板，并在低温下的空气中的再氧化（＆ = 250℃）。结果发现氧气空位主要存在于核心中，而壳体由含有氧空位的表面紊乱层形成，几乎是化学计量。通过还原和/或再氧化温度可以实现表面紊乱层的可控生长。具有表面紊乱层的再氧化BMO表现出约5倍的可见光光催化活性，朝向苯酚降解和朝向亚甲基蓝（MB）降解的数量级较高的活性比未修饰的样品更高。可见光吸收主要由氧空位主导通过调制带隙结构，这促进了太阳光利用和光源性电荷载体。密度泛函理论计算表明，BMO是直接带隙半导体。建议表面紊乱层可以抑制光生载体的直接重组并改善表面反应性，并导致光催化活性的增强。此外，化学计量表面障碍的存在可以促进催化剂稳定性。结果证明，这里应用的还原方法简单，易于控制，有利于非均相核 - 壳纳米结构光催化剂的设计和实现，以改善通过工程表面紊乱和核心内核的氧空位改善可见光和红外光学吸收Bi2moo6纳米载体和相关纳米结构光催化剂。

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