Portal de Periódicos da CAPES

Graphene oxide reduced and modified by environmentally friendly glycylglycine and its excellent catalytic performance

2014; IOP Publishing; Volume: 25; Issue: 13 Linguagem: Inglês

10.1088/0957-4484/25/13/135707

1361-6528

Congcong Zhang, Mingxi Chen, Xiaoyang Xu, Li Zhang, Lei Zhang, Fengling Xia, Xichuan Li, Yu Liu, Wenping Hu, Jianping Gao,

Nanomaterials for catalytic reactions

An environmentally friendly new approach to prepare reduced graphene oxide (RGO) was developed by using glycylglycine (gly-gly) as both a reducing and stabilizing agent. Graphene oxide (GO) was transformed to RGO with the appropriate pH, temperature and reducing agent/GO ratio. The RGO was characterized by ultraviolet–visible spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, thermo-gravimetric analysis, x-ray diffraction, x-ray photoelectron spectroscopy (XPS), and transmission electron microscopy. The RGO aqueous suspension showed extraordinary stability in the absence of any external stabilizing reagents. The XPS analysis showed that this excellent stability is due to modifications of the RGO nanosheets by the gly-gly molecules. The modified RGO complex with copper shows good catalytic performance for reduction of 4-nitrophenol to 4-aminophenol.