scholarly journals Carbon nanotube modified glassy carbon electrode for electrochemical oxidation of alkylphenol ethoxylate

2018 ◽  
Vol 77 (10) ◽  
pp. 2436-2444 ◽  
Author(s):  
Yolanda Patiño ◽  
Eva Díaz ◽  
María Jesús Lobo-Castañón ◽  
Salvador Ordóñez
Keyword(s):  
Electrochemical Oxidation ◽  
Glassy Carbon ◽  
Multiwall Carbon Nanotubes ◽  
Oxidation Peak ◽  
Peak Current ◽  
Glassy Carbon Electrodes ◽  
Emerging Pollutant ◽  
Electrocatalytic Effect ◽  
Reverse Scan ◽  
Alkylphenol Ethoxylate

Abstract Electrochemical oxidation of an emerging pollutant, 2-(4-methylphenoxy)ethanol (MPET), from water has been studied by cyclic voltammetry (CV). Multiwall carbon nanotubes glassy carbon electrodes (MWCNT-GCE) were used as working electrode due to their extraordinary properties. The oxidation process is irreversible, since no reduction peaks were observed in the reverse scan. The electrocatalytic effect of MWCNT was confirmed as the oxidation peak intensity increases in comparison to bare-GCE. The effect of functional groups on MWCNT was also studied by MWCNT functionalized with NH2 (MWCNT-NH2) and COOH (MWCNT-COOH) groups. The oxidation peak current decreases in the following order: MWCNT > MWCNT-NH2 > MWCNT-COOH. Taking into account the normalized peak current, MWCNT-NH2 exhibits the best results due to its strong interaction with MPET. Under optimal conditions (pH = 5.0 and volume of MWCNT = 10 μL), degradation was studied for MWCNT-GCE and MWCNT-NH2-GCE. A complete MPET removal was observed using MWCNT-GCE after four CV cycles, for a volume/area (V/A) ratio equal to 19. In the case of MWCNT-NH2-GCE, the maximum MPET removal was close to 90% for V/A = 37, higher than that obtained for MWCNT-GCE at the same conditions (≈80%). In both cases, no organic by-products were detected.

scholarly journals Electrochemical antioxidant screening and evaluation based on guanine and chitosan immobilized MoS2 nanosheet modified glassy carbon electrode (guanine/CS/MoS2/GCE)

2020 ◽  
Vol 18 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Ping Tang ◽  
Xiaosheng Tang ◽  
Shiyong Mei ◽  
Yixi Xie ◽  
Liangliang Liu ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Antioxidant Capacity ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Carbon Electrode ◽  
Oxidation Peak ◽  
Modified Glassy Carbon Electrode ◽  
Peak Current ◽  
Oxidation Peak Current ◽  
Antioxidant Capacities

AbstractIn this study, an electrochemical biosensor based on guanine and chitosan immobilized MoS2 nanosheet modified glassy carbon electrode (guanine/CS/MoS2/GCE) was developed and employed for antioxidant screening and antioxidant capacity evaluation. The oxidation peak current of guanine was improved and nearly tripled after modifications of chitosan and MoS2 nanosheet. The immobilized guanine could be damaged by hydroxyl radicals generated in Fenton solution. However, in the presence of antioxidants, the guanine was protected and the oxidation peak current of guanine increased. This process mimics the mechanism of antioxidant protection in human body. The factors affecting preparation of sensor and detection of antioxidant capacity were optimized. At the optimum conditions, the guanine/CS/MoS2/GCE showed wide linear range, low detection limit, satisfactory reproducibility and stability for detection. Ascorbic acid was used as a model antioxidant to evaluate the antioxidant capacity. A good linearity was observed with a correlation coefficient of 0.9959 in the concentrations between 0.5 and 4.0 mg L-1. The antioxidant capacities of three flavonoids were also tested and the rank of antioxidant capacities was ascorbic acid (51.84%), quercetin (45.82%), fisetin (34.39%) and catechin (16.99%). Due to the rapid measurement and low cost, this sensor could provide an available sensing platform for antioxidant screening and evaluation.

Electrochemical oxidation of amine-containing compounds: a route to the surface modification of glassy carbon electrodes

Langmuir ◽  
1994 ◽  
Vol 10 (4) ◽  
pp. 1306-1313 ◽  
Author(s):  
Randall S. Deinhammer ◽  
Mankit Ho ◽  
James W. Anderegg ◽  
Marc D. Porter
Keyword(s):  
Surface Modification ◽  
Electrochemical Oxidation ◽  
Glassy Carbon ◽  
Carbon Electrodes ◽  
Glassy Carbon Electrodes

scholarly journals Electrochemical oxidation of methylthiomethyleneisoquinolinium chloride — the first water soluble alkylthiomethylene substituted ammonium salt

2011 ◽  
Vol 9 (5) ◽  
pp. 840-845 ◽  
Author(s):  
Sylwia Smarzewska ◽  
Sławomira Skrzypek ◽  
Barbara Bachowska ◽  
Piotr Bałczewski ◽  
Witold Ciesielski
Keyword(s):  
Electrochemical Oxidation ◽  
Ammonium Salt ◽  
Glassy Carbon ◽  
Spectroscopic Method ◽  
Water Soluble ◽  
Carbon Electrode ◽  
Oxidation Peak ◽  
Citrate Buffer ◽  
Step Potential ◽  
Oxidation Peak Current

AbstractElectrochemical oxidation of methylthiomethyleneisoquinolinium chloride (MTMIQ), the first alkylthiomethyl substituted ammonium salt, which is fully miscible with water has been investigated by voltammetric (SWV) method using glassy carbon electrode. On the electrode, MTMIQ undergoes oxidation at the potential near Ep = 0.07V (vs. Ag/AgCl/3 M KCl). The influence of the pH of buffers, amplitude, frequency, step potential on the received signal was studied. The best results were obtained with a citrate buffer at a pH of 5. The oxidation peak current used for MTMIQ voltammetric determination was in the range of 2–8×10−5 mol L−1, LOD = 3.7×10−6, LOQ = 1.2×10−5. The product of the oxidation was accumulated at the working electrode and was investigated by spectroscopic method. Mechanistic pathways of the oxidation have been proposed.

Trace Determination of Lead and Cadmium using Graphene/[Ru(NH3)6]3+/Nafion Modi-fied Glassy Carbon Electrodes

2017 ◽  
Vol 19 (4) ◽  
pp. 223-228 ◽  
Author(s):  
Shirley Palisoc ◽  
Michelle Natividad ◽  
Diana Mae Mae Calde ◽  
Elias Rafael Rosopa
Keyword(s):  
Glassy Carbon ◽  
Anodic Stripping Voltammetry ◽  
High Surface ◽  
Simultaneous Detection ◽  
Volume Ratio ◽  
Modified Electrodes ◽  
Carbon Electrodes ◽  
Peak Current ◽  
Glassy Carbon Electrodes ◽  
Lead And Cadmium

Graphene/[Ru(NH3)6]3+/nafion modified glassy carbon electrodes were fabricated using the drop coating technique. The fab-ricated electrodes were characterized using scanning electron microscopy (SEM) and cyclic voltammetry (CV). Simultaneous detection of lead (Pb2+) and cadmium (Cd2+) was done via anodic stripping voltammetry (ASV). The effects of varying the amounts of graphene and [Ru(NH3)6]3+ on the transport and sensing properties of the modified electrodes were determined. SEM results showed that the deposited films were smooth and uniform. CV results showed that the peak currents increase monotonically with the amounts of graphene and [Ru(NH3)6]3+. ASV results showed that modification of the GCE with graphene, [Ru(NH3)6]3+ and Nafion greatly enhanced the electrode’s sensitivity in detecting Pb2+ and Cd2+. This can be attributed to the high surface area-to-volume ratio of graphene, the mediation of elec-tron transfer by [Ru(NH3)6]3+ and the antifouling and cationic exchange capabilities of Nafion. The highest peak current for both Pb2+ and Cd2+ were obtained from the electrode modified with 1.5 mg [Ru(NH3)6]3+ and 3.0 mg graphene. A linear relationship between the peak current and metal concentration was obtained in the range of 1.4 ppb to 20 ppb for both Pb2+ and Cd2+ with a detection limit of 1.4 ppb. The modified electrodes were successful in detecting Cd2+ in real water samples. ASV results were verified using atomic absorption spec-troscopy.

Glassy Carbon Electrodes Modified with Multiwall Carbon Nanotubes Dispersed in Polylysine

2008 ◽  
Vol 20 (15) ◽  
pp. 1623-1631 ◽  
Author(s):  
Yamile Jalit ◽  
Marcela C. Rodríguez ◽  
María D. Rubianes ◽  
Soledad Bollo ◽  
Gustavo A. Rivas
Keyword(s):  
Carbon Nanotubes ◽  
Glassy Carbon ◽  
Multiwall Carbon Nanotubes ◽  
Carbon Electrodes ◽  
Glassy Carbon Electrodes ◽  
Multiwall Carbon

Electrochemical Oxidation and Detection of Morphine at Ordered Mesoporous Carbon Modified Glassy Carbon Electrodes

2009 ◽  
Vol 21 (23) ◽  
pp. 2549-2555 ◽  
Author(s):  
Xiangjie Bo ◽  
Wenlin Xie ◽  
Jean Chrysostome Ndamanisha ◽  
Jing Bai ◽  
Liping Guo
Keyword(s):  
Electrochemical Oxidation ◽  
Glassy Carbon ◽  
Mesoporous Carbon ◽  
Ordered Mesoporous Carbon ◽  
Carbon Electrodes ◽  
Glassy Carbon Electrodes ◽  
Ordered Mesoporous

scholarly journals Sensitive Voltammetric Sensor for Tryptophan Detection by Using Polyvinylpyrrolidone Functionalized Graphene/GCE

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 125 ◽  
Author(s):  
Quanguo He ◽  
Jun Liu ◽  
Jinxia Feng ◽  
Yiyong Wu ◽  
Yaling Tian ◽  
...  
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Limit Of Detection ◽  
Phosphate Buffer Solution ◽  
Oxidation Mechanism ◽  
Carbon Electrode ◽  
Oxidation Peak ◽  
Experimental Conditions ◽  
Peak Current ◽  
Oxidation Peak Current

In this paper, an electrochemical method for the measurement of tryptophan (Trp) was developed based on a glassy carbon electrode modified with polyvinylpyrrolidonefunctionalized graphene (PVP-GR)/glassy carbon electrode (GCE). In 0.1 M phosphate buffer solution (PBS, pH = 2.2), compared with bare GCE, PVP/GCE, and GR/GCE, the oxidation peak current of Trp increased dramatically at PVP-GR/GCE. The oxidation mechanism of Trp on the PVP-GR/GCE was discussed and the experimental conditions were optimized. Under the best experimental conditions, the oxidation peak current of Trp was proportional to its concentration in the range of 0.06 µM–10.0 µM and 10.0–100.0 µM, and the limit of detection (LOD) was 0.01 µM (S/N = 3). The target modified electrode with excellent repeatability, stability and selectivity, was successfully applied to detectTrp in drugs and biological samples.

scholarly journals Electrochemical Detection of Iron in a Lixiviant Solution of Polluted Soil Using a Modified Glassy Carbon Electrode

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
D. I. Anguiano ◽  
M. G. García ◽  
C. Ruíz ◽  
J. Torres ◽  
I. Alonso-Lemus ◽  
...  
Keyword(s):  
Glassy Carbon ◽  
Multiwall Carbon Nanotubes ◽  
Pt Nanoparticles ◽  
Polluted Soil ◽  
Carbon Electrodes ◽  
Aqueous Samples ◽  
Modified Glassy Carbon Electrode ◽  
Glassy Carbon Electrodes ◽  
Ionic Iron ◽  
Multiwall Carbon

This paper presents preliminary results on the modification of glassy carbon electrodes with Multiwall Carbon Nanotubes with or without Polyaniline and Pt nanoparticles as electrocatalytic materials for metallic pollutants detection. Electrodes were constructed and incorporated as amperometric detectors of ionic iron electroreduction using the Flow Injection Amperometric technique in aqueous solution. The results not only revealed the modified electrode with nanotubes, polyaniline and platinum nanoparticles were the most selective and sensitive, but also provided an electroanalytic tool to analyze iron in lixiviated samples of polluted soil. The proposed iron sensor exhibited a linear response between 0 and 10 mM with detection and quantification limits of 0.003 and 0.012 μM, respectively. The aqueous samples were taken from a lixiviated solution of polluted soil from Mineral de Pozos, Guanajuato, Mexico, to define the erosion grade of soil.

Sign in / Sign up

Export Citation Format

Share Document