Nanotechnology
Nanotechnology
5 years ago

Simple and green synthesis of piperazine grafted reduced graphene oxide and its application for detection of Hg(II).

Limin Lu, Huakun Xing, Haiyan Jia, Jingkun Xu, Yongfang Yu, Guo Ye, Yinxiu Zuo, Xuemin Duan
In this paper, piperazine grafted reduced graphene oxide (NH-rGO) was synthesized via a simple and green two-step procedure: (i) opening of the resulting epoxides of graphene oxide (GO) with piperazine (NH) through nucleophilic substitution; (ii) reduction of GO with ascorbic acid. Its structure and morphology were characterized by scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). NH-rGO modified glassy carbon electrode (GCE) was explored as electrochemical sensor for determination of Hg(II) using differential pulse anodic stripping voltammetry (DPASV) technique. Hg(II) can be efficiently accumulated and deposited on the surface of modified electrode by strong coordination chemistry bonds formed between Hg(II) and NH. And then the anodic stripping current can be significantly enhanced by rGO with the merits of large specific surface area and high conductivity, which served as signal amplifier, finally realizing the highly sensitive determination of Hg(II). The experimental parameters including pH value of acetate buffer, deposition potential and deposition time were optimized. Under optimal conditions, the developed sensor exhibited a wide linear range from 0.4 nM to 12000 nM with low limit of detection of 0.2 nM, which is well below the guideline value in drinking water set by WHO. Moreover, the practical application of this method was confirmed by assay of Hg(II) in tap water samples with acceptable results.

Publisher URL: http://doi.org/10.1088/1361-6528/aaaf4a

DOI: 10.1088/1361-6528/aaaf4a

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