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首页> 外文期刊>Catalysis science & technology >Synthesis, characterization and enhanced visible light photocatalytic activity of Bi2MoO6/Zn-Al layered double hydroxide hierarchical heterostructures
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Synthesis, characterization and enhanced visible light photocatalytic activity of Bi2MoO6/Zn-Al layered double hydroxide hierarchical heterostructures

机译：BI2MOO6/Zn-Al分层双氢氧化物层次异质结构的合成，表征和增强的可见光光催化活性

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摘要

Bi2MoO6/Zn-Al layered double hydroxide (LDH) hierarchical heterostructures assembled from Bi2MoO6 hierarchical hollow spheres and Zn-Al LDH nanosheets were synthesized by a low-temperature hydro-thermal method. X-ray diffraction, Fourier transform-infrared spectroscopy, thermogravimetric analysis and X-ray photoelectron spectroscopy (XPS) confirmed the formation of the Bi2MoO6/Zn-Al LDH composites. Morphologies were characterized by scanning electron microscopy and transmission electron microscopy (TEM). XPS and high resolution TEM indicated the formation of a Bi2MoO6/Zn-Al LDH heterojunction. Increasing the LDH content from 0 to 27.0 wt.% caused the Brunauer-Emmett-Teller (BET) specific surface area of the composites to gradually increase. The photocatalytic degradation activity for Rhodamine B (RhB) under visible light irradiation exhibited a large enhancement, followed by a decrease, with increasing LDH content. The Bi2MoCVZn-Al LDH heterostructure composite with LDH content of 5.5 wt.% showed the highest photocatalytic activity and degraded 99% of RhB in 80 min, while Bi2MoO6 degraded less than 50%. The average photocatalytic efficiency is enhanced by more than 100%. The enhanced photocatalytic activity of the Bi2MoO6/Zn-At LDH heterostructure photocatalyst was mainly attributed to the efficient separation of photoinduced electrons and holes. Superoxide radicals and holes were the major active species. The Bi2MoO6/Zn-Al LDH heterostructure photocatalyst exhibited excellent stability and reusability. A detailed mechanism for its enhanced photocatalytic activity was discussed in this study. This work provides an effective way to fabricate a series of Bi-based and LDH-containing heterostructure photocatalysts.
机译：BI2MOO6/ZN-AL分层双氢氧化物（LDH）层次异质结构由BI2MOO6层次级别空心球和Zn-Al LDH纳米片组装而成，由低温水力热方法合成。 X射线衍射，傅立叶变换式光谱光谱，热重分析和X射线光电子光谱（XPS）证实了BI2MOO6/ZN-AL LDH复合材料的形成。形态的特征是扫描电子显微镜和透射电子显微镜（TEM）。 XPS和高分辨率TEM表示形成了BI2MOO6/ZN-AL LDH异量。将LDH含量从0增加到27.0 wt。％引起复合材料的布鲁纳 - emmett-teller（BET）比表面积逐渐增加。在可见光照射下，若丹明B（RHB）的光催化降解活性表现出很大的增强，随后LDH含量升高。 LDH含量为5.5 wt。％的BI2MOCVZN-AL LDH异质结构复合材料显示出最高的光催化活性，并在80分钟内降解了99％的RHB，而BI2MOO6的降解低于50％。平均光催化效率提高了100％以上。 BI2MOO6/Zn-AT LDH异质结构光催化剂的增强光催化活性主要归因于光诱导的电子和孔的有效分离。超氧化物自由基和孔是主要的活性物种。 BI2MOO6/ZN-AL LDH异质结构光催化剂表现出极好的稳定性和可重复性。在本研究中讨论了一种增强光催化活性的详细机制。这项工作提供了制造一系列含LDH和LDH的异质结构光催化剂的有效方法。

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