▎ 摘　　要

In this study, graphene oxide (GO) has been prepared using Hammers' method and the produced GO was converted to nitrogen-modified GO (NGO) using hydrothermal reaction with ammonia and hydrazine. The morphology of the product was confirmed with FESEM images and XRD, TEM, Raman, TGA, EDS, BET and FTIR analyses were employed to study the structure and properties of the product. The produced NGO has been employed as a catalyst for oxidative coupling of amines to imines. The reaction was carried out at 110 degrees C, using 4 wt% of catalyst (versus the used amine), oxygen gas as oxidative agent, solvent-free condition in 4 h with 80% yield. To determine the versatility of the reaction, different derivatives of amines such as benzylamine, phenyl hydrazine, aniline, ethylenediamine, ethanol amine and homoveratrylamine have been examined in this reaction and successfully converted to the related imines via heterocoupling reactions. Finally, the recyclability of the reaction was investigated and the results showed only 10% decreasing in the yield after 6 runs.