Room-Temperature Synthesis of Flower-Like BiOX (X鈺怌l, Br, I) Hierarchical Structures and Their Visible-Light Photocatalytic Activity

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• 作者：Lang Chen ; Rui Huang ; Miao Xiong ; Qing Yuan ; Jie He ; Jing Jia ; Meng-Yuan Yao ; Sheng-Lian Luo ; Chak-Tong Au ; Shuang-Feng Yin
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：October 7, 2013
• 年：2013
• 卷：52
• 期：19
• 页码：11118-11125
• 全文大小：616K
• 年卷期：v.52,no.19(October 7, 2013)
• ISSN：1520-510X

文摘

A simple method for facile synthesis of three-dimensional (3D) bismuth oxyhalide (BiOX, X鈺怌l, 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鈥搗is DRS, and N₂ adsorption鈥揹esorption 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鈺怌l, 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鈺怌l, 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.