scholarly journals Sensitive and Simultaneous Electrochemical Sensing for Three Dihydroxybenzene Isomers Based on Poly(L-arginine) Modified Glassy Carbon Electrode

2017 ◽  
Vol 33 (8) ◽  
pp. 917-923 ◽  
Author(s):  
Gangbing ZHU ◽  
Heng SUN ◽  
Junjuan QIAN ◽  
Xiangyang WU ◽  
Yinhui YI
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Dihydroxybenzene Isomers

scholarly journals Electrochemical Determination of Trace Pb (II) by The Modified Glassy Carbon Electrode Compositing MultiWalled Carbon Nanotubes-Nafion-Bi Film

2020 ◽  
pp. 1-12
Keyword(s):  
Carbon Nanotubes ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Anodic Stripping Voltammetry ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
Bismuth Film ◽  
Modified Glassy Carbon Electrode

A modified glassy carbon electrode (GCE) compositing multi-walled carbon nanotubes (MWCNTs), Nafion and bismuth film was prepared and applied for the sensitive detection of trace Pb (II). MWCNTs were dispersed into ethanol by ultrasonication in the presence of Nafion and the nanotubes are coated onto the bare GCE. After that, an extra Nafion adhesion agent is added to the electrode. By the in situ plating, a bismuth film was fabricated on the MWCNTs-NA/GCE, making the desired electrode, MWCNTs-NA-Bi/GCE. The modified electrode was characterized by differential pulse anodic stripping voltammetry, scanning electron microscopy, and cyclic voltammetry. A deposition potential of –1.4 V (vs. Ag/AgCl) and a deposition time of 300 s were applied to the working electrode under stirred conditions after optimizing. Nanotubes and Nafion concentrations and pH were carefully optimized to determine trace lead ions by using the electrode as an electrochemical-sensing platform. Nafion effectively increased the stability and adhesivity of the composite film. The MWCNTs-NA-Bi film modified electrode can remarkably increase the anodic peak current of Pb2+. The sensitivity of MWCNTs-NA-Bi/GCE is 4.35 times higher than that of the bare GCE with bismuth film. The prepared electrode showed excellent stability and reproducibility and can be applied for determination of Pb2+ contained wastewater.

Determination of Dihydroxybenzene Isomers in Wastewater Samples at Poly(Glutamic Acid) Modified Glassy Carbon Electrode

2014 ◽  
Vol 675-677 ◽  
pp. 284-287 ◽  
Author(s):  
Chun Yan Wang ◽  
Ying Xin Qi ◽  
Xiao Qiu Liu
Keyword(s):  
Glutamic Acid ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Differential Pulse ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Dihydroxybenzene Isomers ◽  
Promising Application ◽  
Wastewater Samples

A simple electrochemical method has been developed for the simultaneous determination of dihydroxybenzene isomers in wastewater samples with poly (glutamic acid) modified electrode (PGA/GCE). PGA/GCE was fabricated by electropolymerization of glutamic acid on a glassy carbon electrode (GCE) through cyclic voltammetry (CV). PGA/GCE showed an excellent electrocatalytic ability towards the oxidation of hydroquinone (HQ) and catechol (CC). With CV and differential pulse votammetric (DPV) measurements, HQ and CC in wastewater samples could be simultaneously analyzed at PGA/GCE. The linear range for HQ and CC were 5 - 100 μM and 2 - 160 μM, with a detection limit of 2.0 μM and 1.0 μM, respectively. Moreover, PGA/GCE exhibited good selectivity and repeatability. The method has a promising application in the monitoring of HQ and CC of wastewater.

Synthesis of Polyaniline/Graphene Nanocomposites and Electrochemical Sensing Performance for Formaldehyde

2020 ◽  
Vol 16 (4) ◽  
pp. 493-498
Author(s):  
Lizhai Pei ◽  
Yue Ma ◽  
Fanglv Qiu ◽  
Feifei Lin ◽  
Chuangang Fan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Sensing ◽  
Polymerization Process ◽  
Great Effort ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Liquid Environment ◽  
Graphene Nanocomposites

Background: Formaldehyde has been recognized as the important liquid environmental pollutant which can cause health risk. Great effort has been devoted to detecting formaldehyde in liquid environment. It is of important significance to develop a sensitive method for measuring formaldehyde from the environmental and health viewpoints. Methods: Polyaniline/graphene nanocomposites have been prepared by a simple in-situ polymerization process using graphene and aniline as the raw materials. The nanocomposites were characterized by Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM) and high-resolution TEM (HRTEM). The polyaniline/graphene nanocomposites were applied to modify the glassy carbon electrode for the detection of formaldehyde by cyclic voltammetry (CV) method. Results: The polyaniline/graphene nanocomposites consist of hexagonal graphite phase. The polyaniline particles are dispersed and attached to the surface of the graphene nanosheet-shaped morphology. The thickness of the graphene nanosheets is less than 50 nm. The electrocatalytic performance of the polyaniline/graphene nanocomposites modified glassy carbon electrode towards formaldehyde was obtained. The potential of the irreversible oxidation peak is located at +0.19 V. The polyaniline/graphene nanocomposites modified glassy carbon electrode shows a wide linear range of 0.0001-2 mM and low detection limit of 0.085 μM. Conclusion: The nanocomposites modified glassy carbon electrode possesses good reproducibility and stability. The polyaniline/graphene nanocomposites show great application potential for the electrochemical sensors to detect formaldehyde in liquid environments.

Electrochemical sensing of etoposide using carbon quantum dot modified glassy carbon electrode

The Analyst ◽  
2016 ◽  
Vol 141 (9) ◽  
pp. 2665-2675 ◽  
Author(s):  
Hoai Viet Nguyen ◽  
Lukas Richtera ◽  
Amitava Moulick ◽  
Kledi Xhaxhiu ◽  
Jiri Kudr ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Carbon Quantum Dots ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Carbon Quantum Dot

In this study, carbon quantum dots were used for enhancement of the electrochemical signals of etoposide.

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