光催化
光化学
电子顺磁共振
氮化碳
选择性
单线态氧
石墨氮化碳
化学
催化作用
多相催化
激进的
材料科学
氧气
有机化学
核磁共振
物理
作者
Joana Correia Lopes,Tânia Moniz,Maria J. Sampaio,Cláudia G. Silva,Maria Rangel,Joaquim L. Faria
出处
期刊:Catalysis Today
[Elsevier]
日期:2023-06-01
卷期号:418: 114045-114045
被引量:6
标识
DOI:10.1016/j.cattod.2023.114045
摘要
Heterogeneous photocatalytic systems can provide green organic synthesis at cost-effective processes. In the present work, an efficient, environment-friendly and sustainable heterogeneous photocatalyst, the metal-free exfoliated carbon nitride (GCN-T), is used in the oxidative self-coupling of benzylamine (BZA) to produce N-benzylidenebenzylamine (BZI) within the visible light range of irradiation (LEDs with λmax = 417 nm) under mild reaction conditions. The issue of selectivity is successively addressed with complete conversion of BZA achieved upon 45 min of reaction, under irradiation, for 97 % selectivity towards BZI production. Electron paramagnetic resonance (EPR) spectroscopy is used to investigate the main reactive species involved in the photocatalytic reaction. This analysis revealed that superoxide and singlet oxygen radicals played the leading role in the amine conversion in the heterogeneous photocatalytic mechanism. A reaction pathway is proposed to include all identified species generated during the oxidative self-coupling of BZA under visible light irradiation. The results described here add to the portfolio of customisable heterogeneous photocatalytic solutions towards efficient solar synthesis.
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