Elektrochemische Eigenschaften von Dihydropyridin-und Pyridinderivaten / Electrochemical Properties of Pyridine and Dihydropyridine Derivatives

1981 ◽  
Vol 36 (3) ◽  
pp. 386-390 ◽  
Author(s):  
G. Abou-Elenien ◽  
J. Rieser ◽  
N. Ismail ◽  
K. Wallenfels
Keyword(s):  
Electrochemical Properties ◽  
Electrochemical Oxidation ◽  
Supporting Electrolyte ◽  
Aqueous Solvent ◽  
Dihydropyridine Derivatives

AbstractThe electrochemical oxidation and reduction properties of different dihydropyridines and pyridines have been investigated in non aqueous solvent as benzonitrile and aceto-nitrile with tetra-n-butylammonium perchlorate as supporting electrolyte at platinium electrodes using DC-voltametry, cycl. voltametry and coulometry. Possible redox-mechanisms are discussed.

scholarly journals Electrochemical oxidation of m-cresol purple dye in aqueous media

2015 ◽  
Vol 50 (4) ◽  
pp. 305-313
Author(s):  
Sajjad Khezrianjoo ◽  
Hosakere Doddarevanna Revanasiddappa
Keyword(s):  
Electrochemical Oxidation ◽  
Applied Voltage ◽  
Supporting Electrolyte ◽  
Aqueous Media ◽  
Degradation Process ◽  
Cell System ◽  
Electrolysis Cell ◽  
System A ◽  
Initial Ph ◽  
Indicator Dye

The present investigation showed that the indicator dye m-cresol purple (mCP) was degraded in a laboratory scale, undivided electrolysis cell system. A platinum anode was used for generation of chlorine in the dye solution. The influence of supporting electrolyte, applied voltage, pH, initial dye concentration and temperature were studied. The ultraviolet-visible spectra of samples during the electrochemical oxidation showed rapid decolorization of the dye solution. During the electrochemical degradation process, dye concentration and current were measured to evaluate the energy consumption and current efficiency. After 10 minutes of electrolysis, a solution containing 20 mg/L mCP showed complete color removal at a supporting electrolyte concentration of 1 g/L NaCl, initial pH 6.7, temperature 25 °C and applied voltage 5 V; however, when pH was kept at 6.7, a higher rate constant was observed. There was good fit of the data to pseudo-first-order kinetics for dye removal in all experiments. Dependence of the decolorization rate on the initial mCP concentration can be described as roα[mCP]o−0.98. The apparent activation energy for the electrochemical decolorization of mCP was determined to be −6.29 kJ/mol.

Electrochemical Oxidation of Azo Dye Wastewater Using Graphene-Based Electrode Materials

2019 ◽  
Vol 19 (11) ◽  
pp. 7308-7314
Author(s):  
Jinyan Li ◽  
Qingsong Guan ◽  
Junming Hong ◽  
Chang-Tang Chang
Keyword(s):  
Electrochemical Oxidation ◽  
Current Density ◽  
Electrode Materials ◽  
Supporting Electrolyte ◽  
Performance Comparison ◽  
Carbon Cloth ◽  
Reactive Black 5 ◽  
Dye Wastewater ◽  
Composite Electrodes ◽  
Initial Concentration

Composite electrodes with different graphene (GN)/TiO2 ratios and nano-activated carbon electrodes were prepared for electrocatalytic performance comparison. The electrodes were loaded with platinum (Pt) by use of chloroplatinic acid to promote their performance. Reactive Black 5 (RBk5) dye wastewater was treated as a challenging pollutant by use of advanced electrochemical oxidation technology. The composite materials were characterized by Transmission Electron Microscope (TEM), Field Emission Scanning Electron Microscopy (FE-SEM), and Energy Disperse Spectroscopy (EDS). Results showed that the graphene electrode was prepared successfully and verified because all elements were uniformly loaded on the conductive carbon cloth. The effects of several operating parameters including material types, pH, initial concentration of RBk5, and current density on the removal performance of RBk5 were also assessed. The supporting electrolyte was NaCl solution of 1 g L−1. The concentration of RBk5 was detected using an ultraviolet spectrophotometer with a detection wavelength of 600 nm. The optimum parameters of the experiment were GN/TiO2 ratio of 1:4 and pH of 6.6. The removal efficiency of RBk5 could be higher than 95% under an initial concentration of RBk5 of 5 ppm and a current density of 2.5 mA·cm-2 when reaction time was 30 min.

Electrochemical and biological oxidation of 1,4-dihydropyridine derivatives

1981 ◽  
Vol 46 (5) ◽  
pp. 1141-1147 ◽  
Author(s):  
Antonín Kurfürst ◽  
Jiří Ludvík ◽  
Pavel Rauch ◽  
Miroslav Marek
Keyword(s):  
Electrochemical Reduction ◽  
Nitro Group ◽  
Electrochemical Oxidation ◽  
Respiratory Chain ◽  
Enzyme System ◽  
Biological Oxidation ◽  
Common Trends ◽  
Cyclic Voltametry ◽  
Dihydropyridine Derivatives

Electrochemical oxidation of 1,4-dihydropyridines I-XII and electrochemical reduction of the nitro group of 4-(2-nitrophenyl)-1,4-dihydropyridines III, VI, IX and XII was studied using cyclic voltametry. When comparing the electrochemical and the biological oxidation of 3,5-dimethoxycarbonyl-2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine (IX, Nifedipine) and related 1,4-dihydropyridines it was found that in spite of certain common trends the oxidation of these compounds (I-XII) in the organism cannot be predicted unambiguously. Of the substances tested compounds IX and XI (3,5-diethoxycarbonyl-4-phenyl-2,6-dimethyl-1,4-dihydropyridine) were the least oxidizable by the respiratory chain, and at the same time they did not inhibit this enzyme system. In addition to this, compound IX was the least oxidizable by the microsomal system.

Synthesis, photophysical and electrochemical properties of a new class of fluorescent amidoanthracenophanes

RSC Advances ◽  
2015 ◽  
Vol 5 (90) ◽  
pp. 73951-73957
Author(s):  
Ayyavoo Kannan ◽  
Perumal Rajakumar
Keyword(s):  
Electrochemical Properties ◽  
Electrochemical Oxidation ◽  
Fluorescence Emission ◽  
New Class ◽  
Intense Fluorescence ◽  
Oxidation Reduction

The synthesized amidoanthracenophanes1–4exhibit intense fluorescence emission and electrochemical oxidation reduction characteristic of a flourophoric unit.

The Influence of Phase Dispersion of Sulfide Alloys on their Electrochemical Properties

2011 ◽  
Vol 312-315 ◽  
pp. 719-724 ◽  
Author(s):  
Evgeny N. Selivanov ◽  
O.V. Nechvoglod ◽  
S.V. Mamyachenkov
Keyword(s):  
Electrochemical Properties ◽  
Electrochemical Oxidation ◽  
Nickel Sulfide ◽  
Structural Characteristics ◽  
High Rate ◽  
Linear Potential ◽  
Potential Sweep ◽  
Metallic Component ◽  
Diffusion Limitations ◽  
Copper Nickel

It has been found that the dispersion of phases in copper-nickel sulfide-metal alloys influences their electrochemical properties. X-ray diffraction and optical and electron microscopy have been used to study structural characteristics of the samples prepared by crystallization of sulfide melts at different rates of 10÷103 K/s. High-rate cooling of a converter matte leads to the formation of nonequilibrium sulfide phases and a metallic component dissolved in these phases. The electrochemical oxidation of copper-nickel sulfide alloys has been studied by voltammetry with a linear potential sweep. The data point to a reduction of the limiting oxidation currents of the sulfide alloys prepared by high-rate cooling. The compositions of the intermediate phases and solid products of the electrochemical oxidation, which form the passivating layer, have been determined. The electrolysis of dispersed sulfide alloys allows performing the process at low densities of the current and, thus, the diffusion limitations have been removed.

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