期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 303, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120895
关键词
Metal-free; Selective oxidation; Glucose; Photocatalysis; Carbon nitride
资金
- National Natural Science Foundation of China [21878163, 51708301]
- Fundamental Research Funds for the Central Universities
- Natural Science Foundation of Tianjin, China [17JCZDJC39500]
- 2017 Science and Technology Demonstration Project of Industrial Integration and Development of Tianjin, China [17ZXYENC00100]
- 2017 Jinnan District Science and Technology Project of Tianjin, China [20171505]
Here, we report a metal-free photocatalyst consisting of BNCN and Ce6, which can efficiently and selectively oxidize glucose into gluconic acid and glucaric acid. The introduction of nitrogen defects and optimization of optical absorption have significantly enhanced the total selectivity of the photocatalytic system.
Photocatalysis has exhibited huge potential in many reactions, but the design of metal-free photocatalytic material for selective upgrading of biomass is rarely achieved. Here, we report that the metal-free photocatalyst consisted of nitrogen-deficient carbon nitride (BNCN) and chlorin e6 (Ce6) can efficiently and selectively oxidize glucose into gluconic acid and glucaric acid. Introducing nitrogen defects could significantly enhance the optical absorption and modulate the band structure. In addition, the combination of Ce6 with BNCN further improve the optical absorption property and promote effective separation of photon-generated carriers. As expected, the resultant Ce6@BNCN catalyst gave a total selectivity of gluconic acid, glucaric acid and arabinose as high as 70.9% at glucose conversion up to 62.3%, as is superior to previously reported photocatalytic systems. The mechanism for the enhancement of catalytic performance and the reaction pathway were revealed by experimental studies combined with DFT calculations.
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