Investigation of Electrochemical Properties of Elemental Sulfur Dissolved in Alkaline Solution on Rhodium Electrode

2016 ◽  
Vol 723 ◽  
pp. 640-644
Author(s):  
Gulmira Toktar ◽  
A.B. Bayeshov ◽  
G.A. Mintaeva ◽  
A.A. Adaibekova
Keyword(s):  
Electrochemical Properties ◽  
Alkaline Solution ◽  
Oxidation Reaction ◽  
Elemental Sulfur ◽  
Effective Activation Energy ◽  
Diffusion Mode ◽  
Potentiodynamic Polarization Curves ◽  
First Time ◽  
Polysulfide Ions ◽  
Rhodium Electrode

In this article, the electrochemical properties of elemental sulfur dissolved in alkaline solution has been studied for the first time using the method of removing the anodic and anodic-cathodic potentiodynamic polarization curves on rhodium electrodes. The influences of different parameters for oxidation process of elemental sulfur, namely sulfur component in electrolyte concentration, scan rate and temperature were investigated. The resulting polarogram presented in oxidation reaction of polysulfide ions to elemental sulfur process. This shows that polysulfide-ions in electrolyte at cathodic polarization was restored to monosulfide, and monosulfide –ions oxidized to elemental sulfur. The effective activation energy was calculated which equals 13,67 Kj/mol, indicating the oxidation reaction of sulfur occurred in diffusion mode.

Scanning Electron Microscope Study of Bacteria on Mineral Surfaces

1976 ◽  
Vol 34 ◽  
pp. 130-131
Author(s):  
V.K. Berry
Keyword(s):  
Oxidation Reaction ◽  
Electron Microscope Study ◽  
Elemental Sulfur ◽  
Thiobacillus Ferrooxidans ◽  
Physical Contact ◽  
Metal Sulfides ◽  
Low Grade ◽  
Mineral Surfaces ◽  
Mineral Surface ◽  
Scanning Electron Microscope Study

There are two strains of bacteria viz. Thiobacillus thiooxidansand Thiobacillus ferrooxidanswidely mentioned to play an important role in the leaching process of low-grade ores. Another strain used in this study is a thermophile and is designated Caldariella .These microorganisms are acidophilic chemosynthetic aerobic autotrophs and are capable of oxidizing many metal sulfides and elemental sulfur to sulfates and Fe2+ to Fe3+. The necessity of physical contact or attachment by bacteria to mineral surfaces during oxidation reaction has not been fairly established so far. Temple and Koehler reported that during oxidation of marcasite T. thiooxidanswere found concentrated on mineral surface. Schaeffer, et al. demonstrated that physical contact or attachment is essential for oxidation of sulfur.

scholarly journals Structure and electrochemical activity of nickel aluminium fluoride nanosheets during urea electro-oxidation in an alkaline solution

RSC Advances ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 3190-3201
Author(s):  
Saba A. Aladeemy ◽  
Abdullah M. Al-Mayouf ◽  
Mabrook S. Amer ◽  
Nouf H. Alotaibi ◽  
Mark T. Weller ◽  
...  
Keyword(s):  
Alkaline Solution ◽  
Oxidation Reaction ◽  
Electrochemical Activity ◽  
Aluminium Fluoride ◽  
Electro Oxidation

An electrocatalyst of potassium nickel aluminium hexafluoride (KNiAlF6) nanosheets for enhanced urea oxidation reaction.

Catalytic activity of palladium-doped silver dilute nanoalloys for formate oxidation from a theoretical perspective

2019 ◽  
Vol 21 (40) ◽  
pp. 22598-22610 ◽  
Author(s):  
Nan Zhang ◽  
Fuyi Chen ◽  
Longfei Guo
Keyword(s):  
Catalytic Activity ◽  
Oxidation Reaction ◽  
Theoretical Perspective ◽  
Single Atom ◽  
High Catalytic Activity ◽  
Formate Oxidation ◽  
First Time ◽  
Single Atom Alloys

We demonstrate for the first time that the Pd1Ag single-atom alloys exhibit a high catalytic activity for formate oxidation reaction.

Interphase-oxidized ruthenium metal with half-filled d-orbitals for hydrogen oxidation in an alkaline solution

2020 ◽  
Vol 8 (20) ◽  
pp. 10168-10174
Author(s):  
Jinxia Jiang ◽  
Sicheng Tao ◽  
Qian He ◽  
Jian Wang ◽  
Yuanyuan Zhou ◽  
...  
Keyword(s):  
Alkaline Solution ◽  
Oxidation Reaction ◽  
Hydrogen Oxidation ◽  
High Reactivity ◽  
Metallic Surface ◽  
Hydrogen Oxidation Reaction ◽  
Anodic Potential ◽  
D Orbitals

The interphase-oxidized Ru clusters with half-filled 4d-orbitals can maintain a metallic surface for binding hydrogen at high anodic potential, leading to a high reactivity for hydrogen oxidation reaction in alkaline.

Evolution of Compositions and Contents of Capsule and Slime EPSs for Adaptation to and Action on Energy Substrates and Heavy Metals by Typical Bioleaching Microorganisms

2017 ◽  
Vol 262 ◽  
pp. 466-470 ◽  
Author(s):  
Zhen Yuan Nie ◽  
Hong Chang Liu ◽  
Jin Lan Xia ◽  
Huan Liu ◽  
Yun Lu Cui ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal Ions ◽  
Elemental Sulfur ◽  
Uronic Acids ◽  
Energy Substrates ◽  
Inorganic Matter ◽  
Acidianus Manzaensis ◽  
First Time ◽  
Extracellular Polymer ◽  
Mineral Interaction

Adaption to the energy substrates and heavy metals by bioleaching micoorganisms is the prerequisite for efficient microbe-mineral interaction in bioleaching process. It is known extracellular polymer substances (EPSs) take important role in mediating the adaption to and action on energy substrates and heavy metals. This report presents the evolution of compositions and contents of the major components of EPSs of the typical bioleaching microorganisms (Acidithiobacillus ferrooxidans, Leptospirillum ferriphilum, Sulfobacillus thermosulfidooxidans, and Acidianus manzaensis,) exposed to different energy substrates and heavy metal ions. These strains were acclimated firstly to Fe2+ substrate, and then on the substrates elemental sulfur (S0), pyrite and chalcopyrite, respectively. It was found that the major components of capsule and slime EPSs in terms of proteins, polysaccharides, as well as uronic acids were quite different in contents for the Fe2+-acclimated strains, and they even changed more when the Fe2+-acclimated strains were further acclimated to the other substrates. When exposed to heavy metals, all strains demonstrated much decrease in contents of capsule EPSs, and much increase in slime EPSs contents and the heavy metals were found to bound to the slime parts. It was for the first time the EPSs of the bioleaching strains were fractionated into capsule part and slime part, and it was also for the first time we found the differences in evolution of compositions and contents of the major organic components as well as the inorganic matter of capsule EPSs and slime EPSs when the bioleaching strains were exposed to different energy substrates and heavy metals.

scholarly journals Density functional study on the CO oxidation reaction mechanism on MnN2-doped graphene

RSC Advances ◽  
2020 ◽  
Vol 10 (46) ◽  
pp. 27856-27863
Author(s):  
Mingming Luo ◽  
Zhao Liang ◽  
Chao Liu ◽  
Xiaopeng Qi ◽  
Mingwei Chen ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Co Oxidation ◽  
Oxidation Reaction ◽  
Density Functional ◽  
Functional Study ◽  
Density Functional Study ◽  
Co Oxidation Reaction ◽  
Doped Graphene ◽  
First Time

The various COOR mechanisms on MnN2-doped graphene (MnN2C2: MnN2C2-hex, MnN2C2-opp, MnN2C2-pen) were investigated for the first time.

scholarly journals Gas–solid two-phase flow (GSF) mechanochemical synthesis of dual-metal–organic frameworks and research on electrochemical properties

2020 ◽  
Vol 2 (12) ◽  
pp. 5682-5687
Author(s):  
Jun Zhao ◽  
Bo Jin ◽  
Rufang Peng
Keyword(s):  
Electrochemical Properties ◽  
Mechanochemical Synthesis ◽  
Two Phase Flow ◽  
Metal Organic Frameworks ◽  
Phase Flow ◽  
Two Phase ◽  
Alternative Approach ◽  
Metal Organic ◽  
Dual Metal ◽  
First Time

As an alternative approach for conventional mechanochemical synthesis, a novel gas–solid two-phase flow (GSF) synthetic technique for the mechanochemical synthesis of dual metal–organic frameworks (DMOFs) was reported for the first time.

Mechanical, thermal, and electrochemical properties of Pr doped ceria from wafer curvature measurements

2018 ◽  
Vol 20 (43) ◽  
pp. 27350-27360 ◽  
Author(s):  
Yuxi Ma ◽  
Jason D. Nicholas
Keyword(s):  
Electrochemical Properties ◽  
Material Properties ◽  
Current Collector ◽  
Doped Ceria ◽  
Wafer Curvature ◽  
Curvature Measurements ◽  
Exchange Material ◽  
First Time ◽  
Electrochemical Oxygen

This work demonstrates, for the first time, that a variety of disparate and technologically-relevent thermal, mechanical, and electrochemical oxygen-exchange material properties can all be obtained from in situ, current-collector-free wafer curvature measurements.

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