期刊
CHEMICAL ENGINEERING JOURNAL
卷 422, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130120
关键词
C; O co-doped photocatalyst; 2D; 2D heterojunction; Surface charge transfer; Molecular oxygen activation; Photocatalysis
资金
- Program for the National Natural Science Foundation of China [51779090, 51879101, 51579098, 51709101, 51521006, 51809090, 51909084]
- National Program for Support of TopNotch Young Professionals of China (2014)
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13R17]
- Hunan Natural Science Foundation [2020JJ3009]
- Hunan Researcher Award Program [2020RC3025]
- Hunan Provincial Science and Technology Plan Project [2017SK2243, 2018SK20410, 2016RS3026]
- Science and Technology Innovation Program of Hunan Province [2020RC4014]
- Fundamental Research Funds for the Central Universities [531119200086, 531118010114, 531118040083, 541109060031, 531118010473]
A novel Ni-Co LDH infused C, O co-doped g-C3N4 2D ultrathin nanosheet was prepared with impressive photocatalytic performance, enhanced activation efficiency, and improved surface charge transfer efficiency compared to g-C3N4. The feasible photocatalytic mechanism for molecular oxygen activation was explained based on experimental analysis.
Molecular oxygen is a green and low-cost oxidant, which can be activated to produce reactive oxygen species by solar-light-driven photocatalysis. Here, Ni-Co LDH infused C, O co-doped g-C3N4 two-dimensional (2D) ultrathin nanosheet was prepared by a simple thermal polymerization coupling hydrothermal method. The molecular oxygen activation was estimated by the quantitative determination of center dot O2- and 3,3 ',5,5 '-tetramethylbenzidine (TMB) oxidation. 2D/2D heterojunction exhibits impressive photocatalytic performance. The arrestive activation efficiency is derived from the regulated energy band position, the broadened solar light absorption range, and the enhanced photoexcited electron transfer. Benefitting from these merits, the surface charge transfer efficiency of 2D/2D heterojunction is promoted to 51.3% from 14.3% (g-C3N4). The surface recombination rate constant is reduced to 0.0011 s-1 from 0.0042 s-1 (g-C3N4). The feasible photocatalytic mechanism for molecular oxygen activation is expounded based on experimental analysis.
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