A novel composite material with wood-based carbon quantum dots modified Bi2MoO6 hollow microspheres. (June 2019)

• Record Type: Journal Article
• Authors: Gao, Xing; Ji, Xiaodi; Nguyen, Tat Thang; Gong, Xinchao; Chai, Rusong; Guo, Minghui
• Is Part Of: Vacuum. Volume 164(2019)
• Page Start: 256
• Page End: 264
• Publication Date: 2019-06
• Subjects: Bi2MoO6 hollow microspheres -- CQDs/Bi2MoO6 -- Surface modification -- Photocatalysis; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2019.03.032
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: Composite materials made from renewable resources are challenging, requiring innovative research. In this study, carbon quantum dots (CQDs) were obtained via a simple hydrothermal method using waste larch wood as the raw material without the use of toxic reagents. The CQDs have a delocalized conjugated structure and can cause rapid photogenerated electron-hole pair separation and a relatively slow recombination. They also emit blue-green light upon independent excitation and are potential candidates for use as novel activators. 3D Bi2 MoO6 hollow microspheres are expected to become competitive structures, since they can be synthesized via a mixed solvothermal method without the need for added surfactants or other hard-template conditions. The formation mechanism of Bi2 MoO6 hollow microspheres was systematically examined. Bi2 MoO6 hollow microspheres were selected in this research as the matrix and were doped with CQDs to synthesize a new composite material, CQDs/Bi2 MoO6 . It was observed that methylene blue could be degraded by Bi2 MoO6 hollow microspheres using visible light irradiation, and the photocatalytic performance was increased when modified with CQDs. Additionally, the separation of photogenerated electron-hole pairs was enhanced via the addition of CQDs to Bi2 MoO6 . Thus, the CQDs/Bi2 MoO6 system was more effective for the degradation of methylene blue when irradiated using visible light. Graphical abstract: Image 1 Highlights: 3D Bi2 MoO6 hollow microspheres are synthesized by mixed solvothermal method. The formation mechanism of Bi2 MoO6 hollow microspheres are systematically examined. Waste wood-based carbon quantum dots modify Bi2 MoO6 to obtain the CQDs/Bi2 MoO6 . Migration efficiency of electron-hole pairs is increased by the modification of CQDs. The visible light-driven CQDs/Bi2 MoO6 are effective in degradation of methylene blue.