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Synthesis of Cu_2PO_4OH Hierarchical Superstructures with Photocatalytic Activity in Visible Light

机译：可见光下具有光催化活性的Cu_2PO_4OH层级超结构的合成

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摘要

Using a wet-chemical method and without any surfactants or templates, various 3D hierarchical superstructures of Cu_2PO_4OH were synthesized by simply adjusting the pH. The resulting hierarchical superstructures were characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), high resolution-TEM (HRTEM), Fourier transform infrared spectroscopy (FTIR), Raman, and UV-Vis spectroscopy. With an increase in pH from 2.5 to 7.0, the morphology of Cu_2PO_4OH varied from microrods to walnut-shaped microspheres of self-assembled nanoparticles. A possible mechanism for the formation of the CU_2PO_4OH hierarchical superstructures was also proposed. The optical properties of the Cu_2PO_4OH hierarchical superstructures were strongly related to their morphologies and the size of the assembled crystallites. We further demonstrated the useful photocatalytic activity of these complex structures in the degradation of methylene blue (MB) dye under visible light irradiation (λ > 410 nm). The best photocatalytic performance was achieved by Cu_2PO_4OH with a walnut-shaped morphology due to the excellent absorption of visible light as well as a high BET surface area.
机译：使用湿化学方法且不使用任何表面活性剂或模板，只需调节pH即可合成Cu_2PO_4OH的各种3D分层超结构。使用X射线衍射（XRD），场发射扫描电子显微镜（FESEM），高分辨率TEM（HRTEM），傅立叶变换红外光谱（FTIR），拉曼光谱和UV-Vis光谱对得到的分层超结构进行表征。随着pH值从2.5增加到7.0，Cu_2PO_4OH的形态从微棒到自组装纳米颗粒的胡桃形微球不等。还提出了形成CU_2PO_4OH分层超结构的可能机制。 Cu_2PO_4OH分层超结构的光学性质与它们的形貌和组装的微晶的大小密切相关。我们进一步证明了这些复杂结构在可见光（λ> 410 nm）下降解亚甲基蓝（MB）染料的有用的光催化活性。 Cu_2PO_4OH具有良好的可见光吸收和高BET表面积，因此具有胡桃形形态的Cu_2PO_4OH可获得最佳的光催化性能。

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