期刊
ACS CATALYSIS
卷 4, 期 3, 页码 781-787出版社
AMER CHEMICAL SOC
DOI: 10.1021/cs401118x
关键词
carbon quantum dots; hydrogen bond catalysis; heterogeneous catalysis; aldol condensation; electron acceptor/donor
资金
- National Basic Research Program of China (973 Program) [2012CB825800, 2013CB932702]
- National Natural Science Foundation of China (NSFC) [51132006]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) [ZXG2012028]
- Suzhou Planning Project of Science and Technology [ZXG2012028]
Carbon quantum dots (CQDs) were synthesized by an electrochemical etching method. The CQDs are well-dispersed with uniform size about 5 nm. FT-IR spectra suggest the presence of many hydroxyl groups on the surface of CQDs. Here, CQDs with diameter approximately 5 nm, directly used as effective heterogeneous nanocatalysts for H-bond catalysis in aldol condensations, show excellent photo-enhanced catalytic ability (89% yields when 4-cyanobenzaldehyde is used). It demonstrated that aldol condensation between acetone and aromatic aldehydes resulted in higher yields with visible light irradiation than in the dark, confirming visible light is necessary for good conversion. The H-bond catalytic activities of CQDs can be significantly enhanced with visible light irradiation. The high catalytic activities of CQDs are due to highly efficient electron-accepting capabilities. Repeated catalytic experiments suggest that the CQD catalyst can be easily recycled as a heterogeneous catalyst with a long catalyst life.
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