scholarly journals Surface Electrochemistry of Uranium Dioxide in Acidic Hydrogen Peroxide Solutions

2012 ◽  
Vol 1475 ◽  
Author(s):  
Mayuri Razdan ◽  
David Hall ◽  
David W. Shoesmith
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Layer ◽  
Electrochemical Reduction ◽  
Surface Diffusion ◽  
Uranium Dioxide ◽  
Electrode Surface ◽  
Surface Electrochemistry ◽  
Ph Range ◽  
Acidic Hydrogen

ABSTRACTThe electrochemical reduction of H2O2 on SIMFUEL was investigated over the pH range 1 to 4. The mechanism at pH 4 is known to occur on UV species incorporated into a surface layer of UIV1-2xUV2xO2+x. However, below pH 3, reduction occurs on an adsorbed UVO2(OH) state which is unstable and oxidizes to insulating UVI before dissolving as UO22+. Both schemes are observed at intermediate pH’s. The presence of both low and high acidic regions at the electrode surface is determined by the combination of peroxide concentration, bulk pH and the surface diffusion conditions.

Detection of Radicals Generated by Strong Oxidants in Acidic Media

Holzforschung ◽  
1999 ◽  
Vol 53 (3) ◽  
pp. 285-291 ◽  
Author(s):  
M. Ragnar ◽  
T. Eriksson ◽  
T. Reitberger
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Hydroxyl Radical ◽  
Hydroxyl Radicals ◽  
Second Step ◽  
Stopped Flow ◽  
Acidic Media ◽  
Ph Range ◽  
Acidic Hydrogen ◽  
Ozone Bleaching

Summary A new method to study superoxide and hydroxyl radicals in aqueous solution in the pH range 1 to 6 is described and critically evaluated. The method primarily detects superoxide, which reacts with tetranitromethane (TNM) by reductive cleavage. The strongly coloured nitroform anion (ε350nm = 15000M−1 cm−1) formed, is easily measured in a spectrophotometer or in a stopped-flow equipment. Hydroxyl radicals are measured indirectly. In a first step the hydroxyl radical reacts with iso-propyl alcohol to give acetone and superoxide. The superoxide formed is then in a second step detected with TNM. The TNM-method was primarily designed to monitor the radical formation under ozone bleaching conditions, but it is also applicable in acidic hydrogen peroxide.

scholarly journals RuIII(edta) complexes as molecular redox catalysts in chemical and electrochemical reduction of dioxygen and hydrogen peroxide: inner-sphere versus outer-sphere mechanism

RSC Advances ◽  
2021 ◽  
Vol 11 (35) ◽  
pp. 21359-21366
Author(s):  
Debabrata Chatterjee ◽  
Marta Chrzanowska ◽  
Anna Katafias ◽  
Maria Oszajca ◽  
Rudi van Eldik
Keyword(s):  
Hydrogen Peroxide ◽  
Electron Transfer ◽  
Electrochemical Reduction ◽  
Molecular Oxygen ◽  
Outer Sphere ◽  
Transfer Processes ◽  
Edta Complexes ◽  
Inner Sphere ◽  
Electron Transfer Processes ◽  
Sphere Mechanism

[RuII(edta)(L)]2–, where edta4– =ethylenediaminetetraacetate; L = pyrazine (pz) and H2O, can reduce molecular oxygen sequentially to hydrogen peroxide and further to water by involving both outer-sphere and inner-sphere electron transfer processes.

Features of electrochemical reduction of silk fibroin in the presence of phosphate tricalcium in the form of nanocating

2021 ◽  
pp. 2150476
Author(s):  
Khakkulov Jakhongir Mardonovich ◽  
Kholmuminov Abdufatto Akhatovich ◽  
Temirov Zokir Shukurulloevich
Keyword(s):  
Shear Flow ◽  
Electrochemical Reduction ◽  
Silk Fibroin ◽  
Tricalcium Phosphate ◽  
Electrode Surface ◽  
Newtonian Flow ◽  
Phosphate Ions

The possibilities of movement and electrochemical reduction of fibroin macroions in the presence of tricalcium phosphate ions in the form of a nanocoating during electrolysis have been studied. The manifestation of a non-Newtonian flow of a mixture of macroions and ions in a shear flow, the conditions for their electrochemical reduction in the form of a nanocoating with uniform morphology, and thickness on the electrode surface are revealed. It was found that the excess ions in the mixture and the uneven relief of the electrode surface contribute to the formation of a nanocoating with an inhomogeneous and uneven thickness.

Simultaneous growth of spherical, bipyramidal and wire-like gold nanostructures in solid and solution phases: SERS and electrocatalytic applications

CrystEngComm ◽  
2017 ◽  
Vol 19 (36) ◽  
pp. 5369-5380 ◽  
Author(s):  
N. S. K. Gowthaman ◽  
S. Abraham John
Keyword(s):  
Hydrogen Peroxide ◽  
Electrochemical Reduction ◽  
Gold Nanostructures ◽  
Anisotropic Growth ◽  
Growth Solution ◽  
Simultaneous Growth

Anisotropic growth of Au nanostructures including bipyramidal and nanowires on ITO substrate was achieved by in situ electrochemical reduction of Au+ ions from the growth solution. The AuNS grown ITO substrates were utilized for SERS and electrochemical reduction of hydrogen peroxide.

Sulphur removal from Artvin-Yusufeli lignite with acidic hydrogen peroxide solutions

2016 ◽  
Vol 10 (1/2/3) ◽  
pp. 178 ◽  
Author(s):  
Menderes Levent ◽  
Ömer Kaya ◽  
M. Muhtar Kocakerim ◽  
Özkan Küçük
Keyword(s):  
Hydrogen Peroxide ◽  
Acidic Hydrogen ◽  
Sulphur Removal

scholarly journals Reduced graphene oxides with engineered defects enable efficient electrochemical reduction of dinitrogen to ammonia in wide pH range

Nano Energy ◽  
2020 ◽  
Vol 68 ◽  
pp. 104323 ◽  
Author(s):  
Mingli Zhang ◽  
Changhyeok Choi ◽  
Rupeng Huo ◽  
Geun Ho Gu ◽  
Song Hong ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Graphene Oxides ◽  
Reduced Graphene ◽  
Wide Ph Range ◽  
Reduced Graphene Oxides ◽  
Ph Range
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