Synthesizing of graphene oxide with 6-amino-2,2’-bypyridine for designing a nanosensor to determine the heavy metal ions
Subject Areas :
maryam
abasi ashlagi
1
(دانشجوی دکتری گروه شیمی آلی، دانشکده شیمی دارویی، دانشگاه علوم پزشکی آزاد اسلامی تهران، ایران.)
behrouz
Akbari-Adergani
2
(Faculty member of food and drug administration)
Ali
Ehsani
3
(Faculty member of Qom University)
elahe
kosari
4
(استاد دانشکده شیمی، دانشگاه صنعتی امیرکبیر، تهران، ایران)
Malak
Hekmati
5
(faculty of farmaceutical chemistry)
Keywords: Surface modification, functionalized graphene oxide, Ligand,
Abstract :
Modification of the graphene oxide surface by improving a covalent bond can improve the properties of this material. In the present study, the surface of the prepared graphene oxide was functionaized with 6-amino-2,2'- bipyridine molecules to form a covalent bond between amino groups of the ligand and carboxylic acid groups on the surface. The modified material was termed ABP-GO. The new structure and morphology of the modified compound by pyridine ligands were confirmed with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), Energy–dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). The electrochemical properties of the modified electrode were investigated using electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and differential pulse anodic discharge voltammetry (DPASV) methods. The large surface area and the ability to absorb lead with proper guidance of the modified electrode indicate the proper performance of the Pb (II) sensor, with a detection limit of 3 nM. This electrode quickly provides the bond between the -NH2 group and lead (II) and provides good reusability and reproducibility 5 times and about 90%, respectively.
_||_