Effects of Alkaline Ferrocyanide on Non-faradaic Yields of Anodic Contact Glow Discharge Electrolysis: Determination of the Primary Yield of OH· Radicals

Singh, R.N.; Gangal, Urvashi; Gupta, Susanta K. Sen

doi:10.1007/s11090-012-9361-4

Cited by 13 publications

(7 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An interesting-and almost unique-feature of the CGDE is the tendency to produce molecules (originating from the plasma electrolysis), the faradaic yields of which deviate in excess from theoretical values [4,5,13,[40][41][42]. Indeed, more than 80% of the electrolyzed molecules originate in the liquid phase at the interface close to the plasma (i.e., at the electrode surface) where H 2 O + gas reacts with water molecules leading to the formation of both hydroxyl and proton radicals (H • e OH • ).…”

Section: Resultsmentioning

confidence: 99%

Contact Glow Discharge Electrolysis: Effect of Electrolyte Conductivity on Discharge Voltage

et al. 2020

View full text Add to dashboard Cite

Contact glow discharge electrolysis (CGDE) can be exploited in environmental chemistry for the degradation of pollutants in wastewater. This study focuses on the employment of cheap materials (e.g., steel and tungsten) as electrodes for experiments of CGDE conducted in electrochemical cells with variable electrolytic composition. A clear correlation between breakdown voltage (VB)/discharge (or midpoint) voltage (VD) and the conductivity of the electrolyte is shown. Regardless of the chemical nature of the ionogenic species (acid, base or salt), the higher the conductivity of the solution, the lower the applied potential required for the onset of the glow discharge. Concerning practical application, these salts could be added to poorly conductive wastewaters to increase their conductivity and thus reduce the ignition potential necessary for the development of the CGDE. Such an effect could render the process of chemical waste disposal from wastewaters more economical. Moreover, it is evidenced that both VB and VD are practically independent on the ratio anode area to cathode area if highly conductive solutions are employed.

show abstract

Section: Resultsmentioning

confidence: 99%

Contact Glow Discharge Electrolysis: Effect of Electrolyte Conductivity on Discharge Voltage

et al. 2020

View full text Add to dashboard Cite

show abstract

“…For other discharge types, there exist relevant results but they are rather limited. For example, in studies [23,24] the yield of Á OH and Á H radicals (*10 per electron) was measured for glow discharge electrolysis using radical scavengers. The formation of O 2 and H 2 molecules was discovered as well.…”

Section: Kinetic Model Kinetic Model For Aqueous Solutionsmentioning

confidence: 99%

Kinetics and Mechanism of Cr(VI) Reduction in a Water Cathode Induced by Atmospheric Pressure DC Discharge in Air

Shutov

Sungurova

Choukourov

et al. 2016

Plasma Chem Plasma Process

View full text Add to dashboard Cite

The process of reduction of Cr 6? ions (solution of potassium dichromate, K 2 Cr 2 O 7 ) in a water cathode was studied during a DC discharge in air. The concentration range of Cr 6? was (5.7-19) 910 -5 mol/l and discharge current range was 20-80 mA. Cr 6? ions were shown to be reversibly reduced under a discharge action. The equilibrium degree of reduction increased with increasing initial concentration of the solution at fixed discharge current. At fixed initial concentration the reduction degree increased with increasing discharge current. The reduction degrees so obtained were 0.34-0.84. A kinetic scheme of the processes taking place in a solution was proposed. The calculated data obtained as a result of application of this scheme described well the experimental results on Cr 6? kinetics. The main processes of Cr 6? reduction and Cr 3? oxidation were revealed. HO 2 Á radicals and hydrogen peroxide were shown to be responsible for Cr 6? reduction whereas Á OH radicals and O 2 molecules provide the reverse process of Cr 3? oxidation to Cr 6? . The mechanism of action of phenol additives improving the process efficiency is discussed. The efficiency of phenol action as a radical scavenger was shown to be determined with its mass-transfer to the reaction area rather than chemical reaction rate.

show abstract

“…The resulting value seems quite reasonable. Thus, the yields of H, OH, and H 2 O 2 found in [49,50] were ∼(1-10) per charge passed through the reactor. The authors of these papers also attribute the super-Faraday yields to ion bombardment.…”

Section: Resultsmentioning

confidence: 91%

Kinetics of processes initiated in a water cathode by the action of a direct current discharge at atmospheric pressure in air: simulation and experiment

Shutov¹,

Batova²,

Smirnova³

et al. 2022

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The kinetics of the formation of hydrogen peroxide, nitrate and nitrite ions and the pH of the solution, which served as the cathode, were studied under the action of a direct current discharge at atmospheric pressure in air. A 0-D kinetic model has been developed that describes the reactions occurring in solution. The model includes 28 components, 119 reactions between them, as well as fluxes of particles coming to the surface of the solution from the discharge. The particle fluxes were determined from the 0-D model of a discharge in air based on the self-consistent solution of the Boltzmann equation, the equations of vibrational kinetics for the ground states of N2, O2, H2O, NO molecules, and the equations of chemical kinetics. The proposed model is semi-empirical, since it includes not only known experimental kinetic data, but also some assumptions that were made to match the calculation results with experiment. An analysis of the experimental data and calculations by the model showed that the main factors initiating reactions in solution are the bombardment of the surface by a flux of positive ions accelerated in the cathode potential drop and the flux of NO molecules from the discharge. Ion bombardment leads to the formation of hydrogen peroxide, during the decomposition of which OH radicals are formed, the subsequent reactions of which determine the composition of the particles of the solution. The source of nitrogen-containing particles is the flux of NO molecules from the discharge. Data are given on the kinetics of the concentrations of the main particles of the solution and the analysis of the mechanisms of the processes of their formation and decay. The results of calculations of the concentrations of H2O2, NO2 -, NO3 -, and pH agree with the experiment within the limits of the latter's accuracy.

show abstract

Effects of Alkaline Ferrocyanide on Non-faradaic Yields of Anodic Contact Glow Discharge Electrolysis: Determination of the Primary Yield of OH· Radicals

Cited by 13 publications

References 21 publications

Contact Glow Discharge Electrolysis: Effect of Electrolyte Conductivity on Discharge Voltage

Contact Glow Discharge Electrolysis: Effect of Electrolyte Conductivity on Discharge Voltage

Kinetics and Mechanism of Cr(VI) Reduction in a Water Cathode Induced by Atmospheric Pressure DC Discharge in Air

Kinetics of processes initiated in a water cathode by the action of a direct current discharge at atmospheric pressure in air: simulation and experiment

Contact Info

Product

Resources

About