Photoactive β-Bi2O3 architectures prepared by a simple solution crystallization method
Photoactive β-Bi2O3 architectures prepared by a simple solution crystallization method
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DOI：
10.1016/j.ceramint.2014.06.113
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发表时间：
2014-11
影响因子：
5.2
通讯作者：
Yanbing Lu;Yan Zhao;Jing-zhe Zhao;Yuehong Song;Zhifang Huang;Fangfang Gao;Na Li;Yawen Li
中科院分区：
文献类型：
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作者：
Yanbing Lu;Yan Zhao;Jing-zhe Zhao;Yuehong Song;Zhifang Huang;Fangfang Gao;Na Li;Yawen Li
采用溶液晶化技术，在70 °C下不经煅烧或其他复杂处理，成功地制备了南瓜形的亚稳四氧化二铋（β-Bi 2 O3）结构。β-Bi_2O_3结构的基本单元是宽度约为1 μm的微米棒。采用X射线粉末衍射（XRD）分析了南瓜的亚稳晶体结构，并在场发射扫描电镜（FESEM）上研究了南瓜从不规则颗粒到南瓜聚集体的晶体演化过程。四元β-Bi 2 O3晶体粉末呈橙子，当反应时间达到60 min时，可转变为黄色单斜α-Bi 2 O3晶体，相应的形貌由β-Bi 2 O3晶体的南瓜结构转变为α-Bi 2 O3晶体的大金刚石结构。亚稳β-Bi_2O_3晶体在溶液体系中的稳定化是一个尺寸控制过程。通过调整NaOH浓度、反应温度、搅拌速度等实验参数，亚稳β-Bi 2 O3晶体在反应体系中能稳定保存不同的时间。南瓜β-Bi 2 O3结构在可见光照射下对罗丹明B（RhB）的光催化降解具有良好的光催化活性，这是一种间接的染料光敏降解过程。
Metastable tetragonal bismuth oxide (β-Bi2O3) architectures of pumpkin shape were successfully prepared by a solution crystallization technique, which was performed at 70 °C without further calcination or other complex treatment. The elementary units of β-Bi2O3architectures are microrods of ~1 μm in width. The metastable crystalline structure was determined by X-ray powder diffraction (XRD), and the crystal evolution process from irregular particles to pumpkin aggregates was investigated on a field emission scanning electron microscope (FESEM). The tetragonal β-Bi2O3crystalline powders exhibited orange in color, which could transform to yellow monocline α-Bi2O3crystals upon enough reaction time as 60 min, the corresponding morphology changes from pumpkin structure of β-Bi2O3crystals to big diamond structure of α-Bi2O3crystals. The stabilization of metastable β-Bi2O3crystals in the solution system is a size controlled process. By tuning experimental parameters, such as NaOH concentration, reaction temperature, stirring rate etc., metastable β-Bi2O3crystals can preserve stably in the reaction system for different time. The pumpkin β-Bi2O3architectures showed excellent photocatalytic activity to Rhodamine B (RhB) degradation under visible light irradiation, which is due to an indirect dye photosensitization degradation process.