Encyclopedia of Electrochemistry of the Elements

Bard, Allen J.; Ketelaar, J. Α. Α.

doi:10.1149/1.2132649

Cited by 97 publications

(101 citation statements)

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“…The first wave is the one electron reduction of V(V) to V(IV) in agreement with previous report, 18 while the second wave describes the reduction of V(IV). 18 The second reduction wave appears at a negative potential (-1.0 V to -1.2 V). Since the limiting current of that wave is approximately two-fold higher than that of the V(V) reduction to V(IV), the participation of two electrons in the reduction process is inferred.…”

Section: Electrochemical Investigations Of the Vanadium-tartrate Systemsupporting

confidence: 92%

“…In this oxidation state, vanadium characteristically gives two cathodic waves as reported previously. 18 Cathodic reduction of V(V) to V(IV) begins at +0.3 V and no charging current region is observed as commonly found at dropping mercury electrode. The first wave is the one electron reduction of V(V) to V(IV) in agreement with previous report, 18 while the second wave describes the reduction of V(IV).…”

Section: Electrochemical Investigations Of the Vanadium-tartrate Systemmentioning

confidence: 85%

“…18 Cathodic reduction of V(V) to V(IV) begins at +0.3 V and no charging current region is observed as commonly found at dropping mercury electrode. The first wave is the one electron reduction of V(V) to V(IV) in agreement with previous report, 18 while the second wave describes the reduction of V(IV). 18 The second reduction wave appears at a negative potential (-1.0 V to -1.2 V).…”

Section: Electrochemical Investigations Of the Vanadium-tartrate Systemmentioning

confidence: 85%

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Spectrometric and electrochemical investigation of vanadium(V) and vanadium(IV) tartrate complexes in solution

Khan¹,

Crans²,

Pauliukaitė³

et al. 2006

J. Braz. Chem. Soc.

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Os complexos de vanádio(IV) e (V) com tartarato formados em solução e as suas possíveis interconversões foram estudados utilizando-se técnicas espectroscópicas e eletroquímicas. A investigação foi feita através de espectroscopia de NMR de 51 V combinada com 1 H, de NMR de 13 C e espectroscopia de EPR. Como técnicas electroquímicas utilizaram-se a polagrografia e a voltametria cíclica. Verificou-se que complexo que se forma em maior extensão, em quase todo o intervalo de pH, é o de vanádio(V)-tartarato na proporção 1:1. O complexo 1:2 apresentou menor contribuição. Estes complexos foram formados a partir do complexo de vanádio(IV)-tartarato 2:2. A caracterização electroquímica de V(V) em solução na presença de tartarato por polarografia e por voltametria cíclica demonstrou a formação de complexos. Foram determinados os coeficientes de difusão dos íons livres de vanádio e dos complexos de vanádio-tartarato. Os valores dos coeficientes de difusão foram de 3 × 10 -6 cm 2 s -1 a 17 × 10 -6 cm 2 s -1 , dependendo do pH.Spectroscopic and electrochemical studies were carried out to characterize the vanadium(IV) and (V) complexes that form in solution and their interconversions. 51 V NMR spectroscopy coupled with 1 H NMR, 13 C NMR and EPR spectroscopy were used to characterize the vanadium(V)-tartrate complexes that form in the vanadium-tartrate system. The major complex that forms over most of the pH range is a 1:1 complex. In addition a minor 1:2 complex forms. The 1:2 complex formed from enantiomerically pure tartaric acid was less stable than complex formed from racemic tartaric acid. These complexes are different than the 2:2 complex that is the major contributor in the vanadium(IV)-tartrate system. The polarographic and cyclic voltammetic investigations of the electrochemical behavior of V(V) in the presence of tartrate demonstrated a complex formation. The diffusion coefficient values of free vanadium ions and vanadium-tartrate complexes were determined. The minimum average values for the diffusion coefficient for the vanadium(IV)-tartrate 2:2 complexes were determined to range from 3 × 10 -6 cm 2 s -1 to 17 × 10 -6 cm 2 s -1 depending on pH.

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Section: Electrochemical Investigations Of the Vanadium-tartrate Systemsupporting

confidence: 92%

Section: Electrochemical Investigations Of the Vanadium-tartrate Systemmentioning

confidence: 85%

Section: Electrochemical Investigations Of the Vanadium-tartrate Systemmentioning

confidence: 85%

See 1 more Smart Citation

Spectrometric and electrochemical investigation of vanadium(V) and vanadium(IV) tartrate complexes in solution

Khan¹,

Crans²,

Pauliukaitė³

et al. 2006

J. Braz. Chem. Soc.

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“…The resulting • OH radical, being a very strong oxidizing agent (standard redox potential +2.8 V) [5], can oxidize all organic compounds to the mineral final products, i.e. CO 2 , H 2 O and corresponding inorganic ions, if the compound contains heteroatoms.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of Mecoprop and Clopyralid in Aqueous Suspensions of Nanostructured N-doped TiO2

et al. 2010

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Abstract:The work describes a study of the oxidation power of N-doped and undoped anatase TiO 2 , as well as TiO 2 Degussa P25 suspensions for photocatalytic degradation of the herbicides propionic acid (mecoprop) and 3,6-dichloropyridine-2-carboxylic acid (clopyralid) using visible and UV light. Undoped nanostructured TiO 2 powder in the form of anatase was prepared by a sol-gel route. The synthesized TiO 2 , as well as TiO 2 Degussa P25 powder, were modified with urea to introduce nitrogen into the structure. N-doped TiO 2 appeared to be somewhat more efficient than the starting TiO 2 (anatase) powder when visible light was used for mecoprop degradation. N-doped TiO 2 Degussa P25 was also slightly more efficient than TiO 2 Degussa P25. However, under the same experimental conditions, no degradation of clopyralid was observed in the presence of any of the mentioned catalysts. When the kinetics of mecoprop degradation was studied using UV light, more efficient were the undoped powders, while in the case of clopyralid, N-doped TiO 2 Degussa P25 powder was most efficient, which is probably a consequence of the difference in the molecular structure of the two herbicides. OPEN ACCESSMolecules 2010, 15 2995

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“…A conversion coating rather an than organic coating is used as a surface treatment for anti-corrosion protection, including adherence [5][6][7]. It is desirable that Cr VI -based conversion coatings be replaced due to their high toxicity and carcinogenicity [8].…”

mentioning

confidence: 99%

Adherence Measurements and Corrosion Resistance in Primer/Hot-Dip Galvanized Steel Systems

Floch

Doleyres

Amand

et al. 2013

The Journal of Adhesion

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This paper focuses on the adherence during ageing of a primer (made of polyester resins crosslinked with melamine) applied onto hot-dip galvanized (HDG) steel for coil coating application and its influence on corrosion protection. A chromium-free surface treatment, composed of fluorotitanic acid, phosphoric acid, manganese phosphate, and vinylphenol was applied on the HDG steel to obtain high corrosion resistance and high adherence of a polyester and melamine primer. The influence of the manganese phosphate on the corrosion and adherence was investigated. To measure the adherence between the metal and the primer, a three-point flexure test was set up. The adherence was then linked with corrosion resistance during ageing, using electrochemical impedance spectroscopy.

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Encyclopedia of Electrochemistry of the Elements

Abstract: not Available.

Cited by 97 publications

References 0 publications

Spectrometric and electrochemical investigation of vanadium(V) and vanadium(IV) tartrate complexes in solution

Spectrometric and electrochemical investigation of vanadium(V) and vanadium(IV) tartrate complexes in solution

Photocatalytic Degradation of Mecoprop and Clopyralid in Aqueous Suspensions of Nanostructured N-doped TiO2

Adherence Measurements and Corrosion Resistance in Primer/Hot-Dip Galvanized Steel Systems

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