Room-Temperature Synthesis of Flower-Like BiOX (X=Cl, Br, I) Hierarchical Structures and Their Visible-Light Photocatalytic Activity
Room-Temperature Synthesis of Flower-Like BiOX (X=Cl, Br, I) Hierarchical Structures and Their Visible-Light Photocatalytic Activity
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DOI：
10.1021/ic401349j
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发表时间：
2013-10-07
影响因子：
4.6
通讯作者：
Yin, Shuang-Feng
中科院分区：
文献类型：
--
作者：
Chen, Lang;Huang, Rui;Yin, Shuang-Feng
发展了一种在室温下简便地合成三维(3D)氧卤化铋(BIOX，X=Cl，BrI)分级结构的方法。在L-赖氨酸表面活性剂的作用下，铋和卤素(氯、溴、碘)源在10min内水解并自组装成花状层次结构。用X射线衍射仪、扫描电子显微镜、透射电子显微镜、紫外可见吸收光谱和氮气吸附-脱附技术对合成的材料进行了表征。我们发现，L赖氨酸是形成它们所必需的，而HX的量对最终的形貌有很大的影响。BIOX(X=Cl，Br，I)的分级结构是由单晶纳米板组成的。我们提出了一种氨基和羧基的结构导向机制来形成层级结构。为了评价所制备材料的光催化活性，以罗丹明B为探针染料在可见光下进行降解。所有具有3D结构的BIOX(X=Cl，Br，I)都表现出比片状BIOX更高的光催化活性。这种优越的活性归因于3D分层结构更好的捕光能力。所采用的方法可以方便地用于大规模生成类似类型的新型结构。
A simple method for facile synthesis of three-dimensional (3D) bismuth oxyhalide (BiOX, X=Cl, Br, I) hierarchical structures at room temperature has been developed. Under the influence of L-lysine surfactant, the bismuth and halogen (Cl, Br, I) sources hydrolyze and self-assemble into flower-like hierarchical architectures within 10 min. The resulted materials were characterized by XRD, FESEM, TEM, UV-vis DRS, and N-2 adsorption-desorption techniques. We found that L-lysine is indispensable for their formation and the amount of HX has great effect on the final morphology. The BiOX (X=Cl, Br, I) hierarchical architectures are composed of single-crystalline nanoplates. We propose an amino-and-carboxyl structure-directing mechanism for the formation of the hierarchical structures. To evaluate the photocatalytic activity of the as-prepared materials, rhodamine-B was employed as a probe dye for degradation under visible light. All of the BiOX (X=Cl, Br, I) with 3D architectures show higher photocatalytic activities than their sheet-like counterparts. The superior activity is ascribed to the better light-harvesting capacity of the 3D hierarchical structures. The adopted method can be applied for large-scale generation of novel structures of similar kinds in a facile manner.