Graphene oxide orientated by a magnetic field and application in sensitive detection of chemical oxygen demand
Autor: | Li Yan, Guosong Chen, Kunchao Lu, Tang Meihua, Dong-Hai Lin, Xue Chen, Zhiyi Zhang, Yin Shiyu, Li Xiaolu |
---|---|
Rok vydání: | 2020 |
Předmět: |
Scanning electron microscope
Graphene 010401 analytical chemistry Oxide Analytical chemistry 02 engineering and technology Chronoamperometry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Biochemistry 0104 chemical sciences Analytical Chemistry Dielectric spectroscopy law.invention chemistry.chemical_compound chemistry law Electrode Environmental Chemistry Cyclic voltammetry 0210 nano-technology Spectroscopy |
Zdroj: | Analytica Chimica Acta. 1122:31-38 |
ISSN: | 0003-2670 |
Popis: | An upright GO (UGO) modified screen-printed electrode was prepared with the help of the external magnetic field for improving its electrochemical performance. The ratio of GO: Nafion and the magnetic field intensity on the properties of UGO were examined by scanning electron microscope, cyclic voltammetry and electrochemical impedance spectroscopy. The magnetic field intensity does not influence the electron transfer kinetics but increase the number of active sites and therefore enhance the electroactive surface area. In addition, the UGO electrode that was electrodeposited Ni nanoparticles (denotes as Ni NPs/UGO modified electrode) display excellent oxidation towards glycine using chronoamperometry. The Ni NPs/UGO modified electrode indicated an excellent performance for electrochemical COD (chemical oxide demand) analysis with a linear detection range of 0.1–400 mg/L and a lower detection limit of 0.02 mg/L. Moreover, this Ni NPs/UGO modified electrode can be applied to the rapid determination of COD in general real water samples. The results were in agreement with those obtained by using the standard method (ISO 6060). |
Databáze: | OpenAIRE |
Externí odkaz: |