Citation: Meijuan Chen, Yu Huang, Shun Cheng Lee. Salt-assisted Synthesis of Hollow Bi₂WO₆ Microspheres with Superior Photocatalytic Activity for NO Removal[J]. Chinese Journal of Catalysis, ;2017, 38(2): 348-356. doi: 10.1016/S1872-2067(16)62584-6 shu

Salt-assisted Synthesis of Hollow Bi₂WO₆ Microspheres with Superior Photocatalytic Activity for NO Removal

a School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China;
b Key Lab of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, Shaanxi, China;
c State Key Lab of Loess and Quaternary Geology(SKLLQG), Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, Shaanxi, China;
d Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China

Received Date: 15 September 2016
Revised Date: 18 October 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (41503102, 41401567, 41573138)

Hollow Bi₂WO₆ microspheres are successfully synthesized by a facile ultrasonic spray pyrolysis (USP) method using NaCl as a salt template. The as-prepared hollow microspheres assembled as nanoplates with dimensions of approximately 41-148 nm and are dispersed with non-uniform pores on the template surface. By swapping the salt template with KCl or Na₂SO₄, different morphologies of Bi₂WO₆ are obtained. The experimental results demonstrate that NaCl plays a key role on the formation of Bi₂WO₆ with hollow structures. The specific growth mechanism of hollow microspheres was studied in detail. The Bi₂WO₆ hollow microspheres exhibit an excellent photocatalytic efficiency for NO removal under solar light irradiation, which is 1.73 times higher than for the Bi₂WO₆ obtained in the absence of any salt template. This enhancement can be ascribed to the simultaneous improvement on the surface area and visible light-harvesting ability from the hollow structures. Electron spin resonance (ESR) results suggest that both radicals of ·OH and ·O₂^- are involved in the photocatalytic process over the BWO-NaCl sample. The production of ·O₂^- radicals offers better durability for NO removal.
- Ultrasonic spray pyrolysis,
- Salt template,
- Bi₂WO₆ hollow microsphere,
- NO removal
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Salt-assisted Synthesis of Hollow Bi₂WO₆ Microspheres with Superior Photocatalytic Activity for NO Removal