The Synergistic Effect of Pyridinic Nitrogen and Graphitic Nitrogen of Nitrogen-Doped Graphene Quantum Dots for Enhanced TiO2 Nanocomposites' Photocatalytic Performance

被引：16

作者：

Li, Fei ^{[1
]}

Li, Ming ^{[1
,2
]}

Luo, Yi ^{[1
]}

Li, Ming ^{[1
,2
]}

Li, Xinyu ^{[1
]}

Zhang, Jiye ^{[3
]}

Wang, Liang ^{[2
]}

机构：

[1] Guilin Univ Technol, Coll Sci, Guilin 541004, Peoples R China

[2] Shanghai Univ, Inst Nanochem & Nanobiol, Sch Environm & Chem Engn, Shanghai 200444, Peoples R China

[3] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China

来源：

CATALYSTS | 2018年 / 8卷 / 10期

基金：

中国国家自然科学基金;

关键词：

N-doped graphene quantum dots; TiO2; photocatalytic performance; pyridinic N; graphitic N; VISIBLE-LIGHT PHOTOCATALYSIS; SOL-GEL PROCESS; DYE-SENSITIZATION; OXIDE; DEGRADATION; REDUCTION; NANOPARTICLES; COCATALYST; COMPOSITE; HYBRID;

D O I：

10.3390/catal8100438

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this study, nitrogen-doped graphene quantum dots (N-GQDs) and a TiO2 nanocomposite were synthesized using a simple hydrothermal route. Ammonia water was used as a nitrogen source to prepare the N-GQDs. When optically characterized by UV-vis, N-GQDs reveal stronger absorption peaks in the range of ultraviolet (UV) light than graphene quantum dots (GQDs). In comparison with GQDs/TiO2 and pure TiO2, the N-GQDs/TiO2 have significantly improved photocatalytic performance. In particular, it was found that, when the added amount of ammonia water was 50 mL, the content of pyridinic N and graphitic N were as high as 22.47% and 31.44%, respectively. Most important, the photocatalytic activity of N-GQDs/TiO2-50 was about 95% after 12 min. The results illustrated that pyridinic N and graphitic N play a significant role in photocatalytic performance.

引用

页数：11