Graphene quantum dots modified flower like Bi2WO6 for enhanced photocatalytic nitrogen fixation

Ting Fei; Limin Yu; Zhaoying Liu; Yanhua Song; Fan Xu; Zhao Mo; Chengbao Liu; Jiujun Deng; Haiyan Ji; Ming Cheng; Yucheng Lei; Hui Xu; Huaming Li

doi:10.1016/j.jcis.2019.09.011

Graphene quantum dots modified flower like Bi₂WO₆ for enhanced photocatalytic nitrogen fixation

J Colloid Interface Sci. 2019 Dec 1:557:498-505. doi: 10.1016/j.jcis.2019.09.011. Epub 2019 Sep 4.

Authors

Ting Fei¹, Limin Yu¹, Zhaoying Liu¹, Yanhua Song², Fan Xu¹, Zhao Mo¹, Chengbao Liu³, Jiujun Deng¹, Haiyan Ji¹, Ming Cheng¹, Yucheng Lei¹, Hui Xu⁴, Huaming Li¹

Affiliations

¹ School of Materials Science and Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang 212013, PR China.
² School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China. Electronic address: songyh@just.edu.cn.
³ Jiangsu Key Laboratory for Environment Functional Materials, Suzhou University of Science and Technology, Suzhou 215009, PR China.
⁴ School of Materials Science and Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang 212013, PR China. Electronic address: xh@ujs.edu.cn.

PMID: 31542690
DOI: 10.1016/j.jcis.2019.09.011

Abstract

Graphene quantum dots modified Bi₂WO₆ (GQD/Bi₂WO₆) composites is applied to photocatalytic N₂ fixation. The as-prepared GQD/Bi₂WO₆ samples showed considerable increase in photocatalytic nitrogen fixation compared to the pure Bi₂WO₆ and GQD. The results revealed that GQD uniformly placed on the surface of Bi₂WO₆ and tight junction between the two samples helped to boost the photocatalytic activity. The PL, photocurrent and EIS analyses further demonstrated that the composite had the low recombination rate of photo-generated charges. Photocatalytic nitrogen fixation test indicated that GQD/Bi₂WO₆ with 10 wt% GQDs exhibited the highest ammonia synthesis rate in the presence of visible light, which is 8.88-fold and 33.8-fold higher than pure Bi₂WO₆ and GQD. Simultaneously, the GQD/Bi₂WO₆ sample has high stability.

Keywords: Bi(2)WO(6); Graphene quantum dots; Photocatalytic N(2) fixation.