Vanadates


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Vanadates

 

salts of vanadic acids; also derivatives of vanadium pentoxide, V205. Vanadic acids themselves have not been produced in the free state. Vanadates are formed when V205 is dissolved in alkalies:

V2O5 + 2NaOH = 2NaVO3 + H2O

Vanadates are important in the manufacture of vanadium [it is isolated from a solution such as Ca(V03)2 and NH4VO3]. They are used in the textile industry as a mordant in dyeing cotton cloth and for fixing aniline on silk.

References in periodicals archive ?
In any condition of partial pressure of oxygen and sodium oxide activity (basicity), it will form nonprotective corrosion products of iron oxides or iron vanadates. Furthermore, in normal operation conditions of oil-fired power stations, Cr always form chromium vanadates nonprotective, and only in conditions of low partial pressure of oxygen and low basicity, the chromium oxide will be stable.
XRD results evidence the formation of these metallic vanadates. Table 2 presents the melting points of the metallic vanadates formed during the dissolution of the corresponding metallic oxides in presence of NaV[O.sub.3].
Pyrobelonite is an orthorhombic lead and manganese vanadate, the analog of descloizite in which manganese substitutes for zinc, originally described from Langban, Sweden.
(1931) Fervanite, a hydrous ferric vanadate, American Mineralogist, 16, 273-277.
Yang, "Preparation of visible-light-driven silver vanadates by a microwave-assisted hydrothermal method for the photodegradation of volatile organic vapors," Industrial & Engineering Chemistry Research, vol.
In the first case the information derived from the potentiodynamic polarization curves corresponds to the interaction of the bare Ni surface with the molten salts, and in the second case due to the corrosion process of Ni with corrosion products adhered to its surface (NiO and nickel vanadates).
Gresser, "Interaction of vanadate with phenol and tyrosine: implications for the effects of vanadate on systems regulated by tyrosine phosphorylation.," Proceedings of the National Academy of Sciences, vol.
Baquer, "Low doses of vanadate and Trigonella synergistically regulate [Na.sup.+]/[K.sup.+]-ATPase activity and GLUT4 translocation in alloxan-diabetic rats," Molecular and Cellular Biochemistry, vol.
Abstract Polypyrrole (PPy) doped with either tungstate or vanadate as counter anions was synthesized by chemical oxidative polymerization on the surface of aluminum (Al) flakes.
The purpose of this work, therefore, was to study the substitution of samarium ([Sm.sup.3+]) for lead in lead sodium vanadate [Pb.sub.8][Na.sub.2][(V[O.sub.4]).sub.6].
Recently vanadates have attracted much attention because of their rich structural chemistry which easily adapts to various structural forms like tetrahedral, square-pyramidal, and octahedral coordination environments in various oxidation states.