Effects of Anode Materials and Chloride Ions on Current Efficiency of Electrochemical Oxidation of Carbohydrate Compounds

2019 ◽  
Vol 166 (13) ◽  
pp. H628-H634 ◽  
Author(s):  
Chong Min Chung ◽  
Woonghee Lee ◽  
Seok Won Hong ◽  
Kangwoo Cho
Keyword(s):  
Current Efficiency ◽  
Electrochemical Oxidation ◽  
Anode Materials ◽  
Chloride Ions

scholarly journals Anti-corrosion porous RuO2/NbC anodes for the electrochemical oxidation of phenol

RSC Advances ◽  
2019 ◽  
Vol 9 (30) ◽  
pp. 17373-17381 ◽  
Author(s):  
Jing Ma ◽  
Guotong Qin ◽  
Wei Wei ◽  
Tianliang Xiao ◽  
Shaomin Liu ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Electrochemical Oxidation ◽  
Specific Surface Area ◽  
Anode Materials ◽  
Reaction Rate ◽  
High Specific Surface Area ◽  
Porous Structures ◽  
Slow Reaction ◽  
Oxidation Of Phenol

Efficient anode materials with porous structures have drawn increasing attention due to their high specific surface area, which can compensate for the slow reaction rate of electrochemical oxidation.

scholarly journals Effect of Chloride Ions on the Electrochemical Oxidation of Chalcopyrite at 340 °C and 21 MPa

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1071
Author(s):  
Luying Wang ◽  
Heping Li ◽  
Qingyou Liu ◽  
Liping Xu ◽  
Lei Zha ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Protective Property ◽  
Electrochemical Impedance ◽  
Chloride Ions ◽  
Ionic Diffusion ◽  
Copper Extraction ◽  
Dissolution Mechanism ◽  
Oxidation Layer ◽  
X Ray ◽  
Nacl Concentration

Understanding the oxidative mechanisms of chalcopyrite in various hydrothermal fluids is of great significance to improve copper extraction and to model the geochemical cycling of copper, iron, and sulfur. This paper investigated the effect of NaCl on the electrochemical oxidation of chalcopyrite at 340 °C and 21 MPa using polarization curves, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and Raman spectroscopy. The experimental results showed that NaCl can promote chalcopyrite leaching. As NaCl concentration increases, the protective property of the oxidation layer degraded. In the absence of NaCl, the oxidation layer that consisted of CuSn, (n ≥ 1), probably with some Fe2O3 and Fe(OH)3 and also in the presence of NaCl, Fe2O3, is the principal oxidation product. More rapid ionic diffusion and further chemical reaction contributed to the improvement of chalcopyrite dissolution with increasing NaCl concentration. A dissolution mechanism is proposed in this paper to explain the chalcopyrite leaching processes which is dependent on NaCl concentration.

scholarly journals Wastewater Minimization in Indirect Electrochemical Synthesis of Phenylacetaldehyde

2002 ◽  
Vol 2 ◽  
pp. 48-52 ◽  
Author(s):  
Zhirong Sun ◽  
Xiang Hu ◽  
Ding Zhou
Keyword(s):  
Sulfuric Acid ◽  
Current Efficiency ◽  
Electrochemical Oxidation ◽  
Acid Concentration ◽  
Electrochemical Synthesis ◽  
Chemical Process ◽  
Sulfuric Acid Concentration ◽  
High Yield ◽  
High Current ◽  
High Current Efficiency

Wastewater minimization in phenylacetaldehyde production by using indirect electrochemical oxidation of phenylethane instead of the seriously polluting traditional chemical process is described in this paper. Results show that high current efficiency of Mn(III) and high yield of phenylacetaldehyde can be obtained at the same sulfuric acid concentration (60%). The electrolytic mediator can be recycled and there will be no waste discharged.

Influence of the anode materials on the electrochemical oxidation efficiency. Application to oxidative degradation of the pharmaceutical amoxicillin

2015 ◽  
Vol 262 ◽  
pp. 286-294 ◽  
Author(s):  
Flamur Sopaj ◽  
Manuel A. Rodrigo ◽  
Nihal Oturan ◽  
Fetah I. Podvorica ◽  
Jean Pinson ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Anode Materials ◽  
Oxidative Degradation ◽  
Oxidation Efficiency

Efficiency of Different Mass Transfer Modes in Electrochemical Oxidation Treatment for Landfill Leachate

2012 ◽  
Vol 599 ◽  
pp. 60-66 ◽  
Author(s):  
Jin Guo Dai ◽  
Qian Wu Song ◽  
Qi Wu
Keyword(s):  
Mass Transfer ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Current Efficiency ◽  
Electrochemical Oxidation ◽  
Landfill Leachate ◽  
Oxidation Rate ◽  
Water Jet ◽  
Pressure Water

The effect of different mass transfer ways in landfill leachate treatment by electrochemical oxidation was studied, the electrochemical oxidation rate, current efficiency and energy consumption were mainly discussed by four different mass transfer ways—including higher pressure water jet electrode, aeration, mixing and natural convection. The results show that mass transfer way has an important influence for NH4+-N and CODcr removal in electrochemical oxidation landfill leachate, high pressure water jet has high current efficiency, oxidation rate and lower energy consumption, which is 7.41 mg/L.min, 48% and 0.11 Kwh/gNH4+-N in electrolytic 6 hours, respectively. Different mass transfer ways have different mass transfer coefficient, improving mass transfer coefficient could increase transfer rate and the overall efficiency of system.

scholarly journals Electrochemical Oxidation of Monosaccharides at Nanoporous Gold with Controlled Atomic Surface Orientation and Non-Enzymatic Galactose Sensing

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5632
Author(s):  
Yasuhiro Mie ◽  
Shizuka Katagai ◽  
Masiki Ikegami
Keyword(s):  
Electrochemical Oxidation ◽  
Electrochemical Sensors ◽  
Oxidation Potential ◽  
Chloride Ions ◽  
Nanoporous Gold ◽  
Calibration Plot ◽  
Current Response ◽  
Positive Potential ◽  
Physiological Conditions ◽  
Atomic Surface

Non-enzymatic saccharide sensors are of great interest in diagnostics, but their non-selectivity limits their practical diagnostic abilities. In this study, we investigated the electrochemical oxidation of monosaccharides at nanoporous gold (NPG) catalysts with different contributions of surface crystallographic orientations. Fructose elicited no clear electrochemical response, but glucose, galactose, and mannose produced clear oxidative current. The onset potentials for oxidation of these saccharides depended on the surface atomic structure of the NPG. The oxidation potential was approximately 100 mV less positive at the Au(100)-enhanced NPG than at the Au(111)-enhanced NPG. Furthermore, the voltammetric responses significantly differed among the saccharides. Galactose was oxidized at less positive potential and exhibited a higher current response than the other saccharides. This tendency was enhanced in the presence of chloride ions. These features enabled the selective and sensitive detection of galactose at an NPG electrode without enzymes under physiological conditions. A linear range of 10 μM to 1.8 mM was obtained in the calibration plot, which was comparable to those in previously reported enzymatic galactose sensors. Thus, we demonstrated that controlling the crystallographic orientation on the nanostructured electrode surface is useful in developing electrochemical sensors.

scholarly journals A 2.5D Electrode System Constructed of Magnetic Sb–SnO2 Particles and a PbO2 Electrode and Its Electrocatalysis Application on Acid Red G Degradation

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 875 ◽  
Author(s):  
Yuan ◽  
Salman ◽  
Guo ◽  
Xu ◽  
Xu ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Current Efficiency ◽  
Electrochemical Oxidation ◽  
High Performance ◽  
Oxygen Demand ◽  
Electrode System ◽  
Toc Removal ◽  
Pbo2 Electrode ◽  
Higher Temperature ◽  
Acid Red G

A novel electrode consisting of a Ti/PbO2 shell and Fe3O4/Sb–SnO2 particles was developed for electrochemical oxidation treatment of wastewater. Scanning electron microscope (SEM), X-ray diffraction (XRD), the current limiting method, toxicity experiments, and high-performance liquid chromatography were adopted to characterize its morphology, crystal structure, electrochemical properties, the toxicity of the wastewater, and hydroxyl radicals. Acid Red G (ARG), a typical azo dye, was additionally used to test the oxidation ability of the electrode. Results indicated that the 2.5D electrode could significantly improve the mass transfer coefficient and •OH content of the 2D electrode, thereby enhancing the decolorization, degradation, and mineralization effect of ARG, and reducing the toxicity of the wastewater. The experiments revealed that, at higher current density, lower dye concentration and higher temperature, the electrochemical oxidation of ARG favored. Under the condition of 50 mA/cm2, 25 °C, and 100 ppm, the ARG, Chemical Oxygen Demand (COD) and Total Organic Carbon (TOC) removal efficiency reached 100%, 65.89%, and 52.52%, respectively, and the energy consumption and the current efficiency were 1.06 kWh/g COD, 8.29%, and energy consumption for TOC and mineralization current efficiency were 3.81 kWh/g COD, 9.01%. Besides, the Fe3O4/Sb–SnO2 particles after electrolysis for 50 h still had remarkable stability. These results indicated that the ARG solution could be adequately removed on the 2.5D electrode, providing an effective method for wastewater treatment.

The fortuitous direct electrochemical synthesis of some copper(I) complexes

1981 ◽  
Vol 59 (1) ◽  
pp. 62-64 ◽  
Author(s):  
Farouq F. Said ◽  
Dennis G. Tuck
Keyword(s):  
Complex Formation ◽  
Current Efficiency ◽  
Electrochemical Oxidation ◽  
Electrochemical Synthesis ◽  
Solution Chemistry ◽  
Formation Processes ◽  
Halide Complexes

The electrochemical oxidation of copper in the presence of RX (R = CH3, C6H5, C6H5CH2; X = Cl, Br, I, not all combinations) and either 2,2′-bipyridine or (C2H5)4NX gives rise to neutral or anionic copper(I) halide complexes. The current efficiency shows that CuX is produced at the anode; the subsequent solution chemistry influences the complex formation processes.

scholarly journals Comparative mineralization of Basic Red 18 with electrochemical advanced oxidation processes

2018 ◽  
Vol 83 (1) ◽  
pp. 93-105 ◽  
Author(s):  
Belgin Gozmen ◽  
Ozgur Sonmez ◽  
Azize Sozutek
Keyword(s):  
Aqueous Solutions ◽  
Current Efficiency ◽  
Electrochemical Oxidation ◽  
Sodium Sulfate ◽  
Contact Time ◽  
Advanced Oxidation Processes ◽  
Sulfate Concentration ◽  
Oxidation Processes ◽  
Electrochemical Advanced Oxidation Processes

In this study, the role of electrochemical oxidation processes, including the electro-Fenton, the electro-persulfate (PS), and the electro/FeII /PS processes, in the removal of Basic Red 18 (BR18) from aqueous solutions was investigated. It was found that the electro-PS process successfully removes colour, but after 5 h, it produced only 75 % mineralization. In the same conditions, more effective mineralization was achieved by the electro/FeII/PS process than by the electro-Fenton method. At pH levels of 3.0 and 5.7, very effective mineralization results were produced by the electro/FeII/PS process. Moreover, the maximum mineralization current efficiency values were obtained by the electro/ FeII/PS process. The mineralization efficiency of the electro/FeII/PS process was determined to be 97 % under the following conditions: BR18 initial dye concentration of 100 mg L-1, pH of 5.7, contact time of 5 h, PS concentration of 10 mM, Fe2+ concentration of 0.2 mM, and a sodium sulfate concentration of 0.05 M.

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