A Templated Method to\nBi<sub>2</sub>WO<sub>6</sub> Hollow Microspheres and Their Conversion\nto Double-Shell Bi<sub>2</sub>O<sub>3</sub>/Bi<sub>2</sub>WO<sub>6</sub> Hollow Microspheres\nwith Improved Photocatalytic Performance
Xiaona Li (397002)Renkun Huang (1709692)Yanhua Hu (272970)Yongjuan Chen (684744)Wenjun Liu (162986)Rusheng Yuan (1672270)Zhaohui Li (442068)
Abstract
Bi<sub>2</sub>WO<sub>6</sub> hollow microspheres with\ndimension\nof ca. 1.5 μm were synthesized via a hydrothermal method using\npolystyrene particles as the template. The as-prepared Bi<sub>2</sub>WO<sub>6</sub> hollow microspheres can be further transformed to\ndouble-shell Bi<sub>2</sub>O<sub>3</sub>/Bi<sub>2</sub>WO<sub>6</sub> hollow microspheres. The samples were fully characterized by X-ray\ndiffraction, scanning electron microscopy, transmission electron microscopy\n(TEM), high-resolution TEM, N<sub>2</sub>-sorption Brunauer–Emmett–Teller\nsurface area, UV–vis diffuse-reflectance spectroscopy, and\nX-ray photoelectron spectroscopy. The as-formed double-shell Bi<sub>2</sub>O<sub>3</sub>/Bi<sub>2</sub>WO<sub>6</sub> hollow microspheres\nexhibit enhanced photocatalytic activity due to the hollow nature\nand formation of the p–n junction between p-type Bi<sub>2</sub>O<sub>3</sub> and n-type Bi<sub>2</sub>WO<sub>6</sub>. The study\nprovides a general and effective method in the fabrication of composition\nand dimension-tunable composite hollow microspheres with sound heterojunctions\nthat may show a variety of applications.
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