In situ reorganization of Bi3O4Br nanosheet on the Bi24O31Br10 ribbon structure for superior visible-light photocatalytic capability
In situ reorganization of Bi3O4Br nanosheet on the Bi24O31Br10 ribbon structure for superior visible-light photocatalytic capability
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Bi3O4Br纳米片在Bi24O31Br10带结构上的原位重组具有优异的可见光光催化能力
DOI：
10.1016/j.seppur.2020.117007
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发表时间：
2020-09
影响因子：
8.6
通讯作者：
Fan Caimei
中科院分区：
文献类型：
--
作者：
Li Rui;Feng Junqiang;Zhang Xiaochao;Xie Fangxia;Liu Jianxin;Zhang Changming;Wang Yawen;Yue Xiuping;Fan Caimei
与0 D/2D和1D/2D异质结相比，原位合成的2D/2D异质结通常表现出更均匀的混合物和更强的界面相互作用，从而提供更高的界面电荷转移和更大的界面接触面积。本文通过水热法原位重组原始元素，并在NH3·H2O的干预下，制备了具有“纳米片-带”分级结构的新型2D/2D Bi 24 O31 Br 10/Bi 3 O 4 Br异质结。Bi 24 O31 Br 10/Bi 3 O 4 Br异质结具有比纯Bi 3 O 4 Br和Bi 24 O31 Br 10更好的可见光活性，在180 min内对磺胺甲恶唑的光降解率达到85%，在30 min内对NO的光降解率达到32.5%。采用X射线衍射、扫描电子显微镜、透射电子显微镜、差示反射光谱、价带X射线光电子能谱、Mott-Schottky方法、密度泛函理论、光致发光光谱、光电流分析和电化学阻抗谱等手段对样品的晶相、光学吸收性能、形貌、微观结构和能带结构进行了表征。其上级光催化活性的原因在于Bi 3 O 4 Br和Bi 24 O31 Br 10之间的特殊结构和界面相互作用，从而增强了表面活性位，延长了光吸收时间，促进了光催化反应过程中的电荷分离能力。提出了Bi 24 O31 Br 10/Bi 3 O 4 Br异质结的形成机理，NH3·H2O不仅是一种pH调节剂，也是一种结构控制剂。该工作为原位合成多功能二维/二维光催化纳米复合材料提供了参考。
In situ synthesized 2D/2D heterojunctions often exhibit a more homogeneous mixture and stronger interface interaction, thereby providing higher interfacial charge transfer and larger interface contact area compared with 0D/2D and 1D/2D heterojunctions. Herein, novel 2D/2D Bi24O31Br10/Bi3O4Br heterojunctions with a “nanosheet-on-ribbon” hierarchical structure were fabricated via in situ reorganization of original elements in a hydrothermal process, and this method was accomplished through the intervention of NH3·H2O. The Bi24O31Br10/Bi3O4Br heterojunctions exhibit outstanding visible light activity than pure Bi3O4Br and Bi24O31Br10, reaching photodegradation efficiency of 85% for sulfamethoxazole in 180 min and removal rate of 32.5% for NO in 30 min. Crystalline phases, optical absorption properties, morphologies, microstructures, and band structures were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, differential reflectance spectroscopy, valence band X-ray photoemission spectroscopy, Mott–Schottky methods, density functional theory, photoluminescence spectroscopy, photocurrent analysis, and electrochemical impedance spectroscopy. The superior photocatalytic activity could be ascribed to the special structure and interface interaction between Bi3O4Br and Bi24O31Br10, thereby enhancing surface-active sites, prolonging light absorption, and promoting charge separation capability during the photocatalytic reaction. The formation mechanism of Bi24O31Br10/Bi3O4Br heterojunctions was proposed, and NH3•H2O was not only a pH adjuster but also a structure-controlling agent. This work provides a reference for in situ synthesis of multifunctional 2D/2D photocatalytic nanocomposites.
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