Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 35, Pages 31844-31850Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b08741
Keywords
graphene oxide; imines; amines; heterogeneous catalysis; oxidation
Funding
- Specialized Research Funds for the National Natural Science Foundation of China [21506157]
- Program of Introducing Talents of Discipline to Universities [B06006]
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Graphene oxide (GO), an emerging material ornamented with oxygen-containing functional groups, is becoming a promising alternative for various applications. The piranha solution treatment of GO can increase oxygen-containing functional groups and result in improved graphene oxide (IGO), as well as restore the functional groups lost because of the reaction. It is found that GO can oxidize the amine to the corresponding imine in the absence of oxygen and a catalyst, and the obtained IGO even shows higher activity. In addition, the piranha solution can partially restore the reactivity of GO after the reaction. The different roles of oxygen-containing functional groups in the oxidative coupling reaction are investigated. A possible reaction mechanism for the oxidation of benzylamine to N-benzylidene benzylamine is also proposed.
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