A Templated Method to
Bi<sub>2</sub>WO<sub>6</sub> Hollow Microspheres and Their Conversion
to Double-Shell Bi<sub>2</sub>O<sub>3</sub>/Bi<sub>2</sub>WO<sub>6</sub> Hollow Microspheres
with Improved Photocatalytic Performance
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Abstract
Bi<sub>2</sub>WO<sub>6</sub> hollow microspheres with
dimension
of ca. 1.5 μm were synthesized via a hydrothermal method using
polystyrene particles as the template. The as-prepared Bi<sub>2</sub>WO<sub>6</sub> hollow microspheres can be further transformed to
double-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
diffraction, scanning electron microscopy, transmission electron microscopy
(TEM), high-resolution TEM, N<sub>2</sub>-sorption Brunauer–Emmett–Teller
surface area, UV–vis diffuse-reflectance spectroscopy, and
X-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
exhibit enhanced photocatalytic activity due to the hollow nature
and 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
provides a general and effective method in the fabrication of composition
and dimension-tunable composite hollow microspheres with sound heterojunctions
that may show a variety of applications
