Visible-Light Driven TiO2 Photocatalyst Coated with Graphene Quantum Dots of Tunable Nitrogen Doping

Molecules

Dongjin Qian¹  Junhe Yang²  Bojie Gui²  Hui-Jun Li²  Xianying Wang²  Xiong Sun²  Nanquan Ou²  Bowen Lyu²  Shiwei Tian² 

[1]Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, No. 220 Handan Rd., Shanghai 200433, China

[2]School of Materials Science and Technology, University of Shanghai for Science and Technology, No. 516 Jungong Rd., Shanghai 200093, China

关键词: N-doping GQDs;    titanium dioxide;    surface modification;    photocatalytic;    RhB degradation;   

DOI  :  10.3390/molecules24020344

来源: DOAJ

【 摘 要 】

Nitrogen doped graphene quantum dots (NGQDs) were successfully prepared via a hydrothermal method using citric acid and urea as the carbon and nitrogen precursors, respectively. Due to different post-treatment processes, the obtained NGQDs with different surface modifications exhibited blue light emission, while their visible-light absorption was obviously different. To further understand the roles of nitrogen dopants and N-containing surface groups of NGQDs in the photocatalytic performance, their corresponding composites with TiO2 were utilized to degrade RhB solutions under visible-light irradiation. A series of characterization and photocatalytic performance tests were carried out, which demonstrated that NGQDs play a significant role in enhancing visible-light driven photocatalytic activity and the carrier separation process. The enhanced photocatalytic activity of the NGQDs/TiO2 composites can possibly be attributed to an enhanced visible light absorption ability, and an improved separation and transfer rate of photogenerated carriers.

【 授权许可】

Unknown