Topic
Vanadate
About: Vanadate is a research topic. Over the lifetime, 4497 publications have been published within this topic receiving 120109 citations. The topic is also known as: vanadate.
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TL;DR: In this paper, a comparative structural-vibrational study of nanostructures of nanourchins, nanotubes, and nanorods of vanadium oxide nanocomposite is presented.
Abstract: We report the comparative structural-vibrational study of nanostructures of nanourchins, nanotubes, and nanorods of vanadium oxide. The tube walls comprise layers of vanadium oxide with the organic surfactant intercalated between atomic layers. Both Raman scattering and infrared spectroscopies showed that the structure of nanourchins, nanotubes, and nanorods of vanadium oxide nanocomposite are strongly dependent on the valency of the vanadium, its associated interactions with the organic surfactant template, and on the packing mechanism and arrangement of the surfactant between vanadate layers. Accurate assignment of the vibrational modes to the V–O coordinations has allowed their comparative classification and relation to atomic layer structure. Although all structures are formed from the same precursor, differences in vanadate conformations due to the hydrothermal treatment and surfactant type result in variable degrees of crystalline order in the final nanostructure. The nanotube-containing nanourchins contain vanadate layers in the nanotubes that are in a distorted –V 5+ conformation, whereas the the nanorods, by comparison, show evidence for V 5+ and V 4+
66 citations
TL;DR: In this paper, the partial oxidation of ethane has been investigated on silica-supported alkali metal vanadate catalysts in a fixed-bed continuous-flow reactor at 770-823 K using N2O as oxidant.
66 citations
TL;DR: Results show that hydrotalcites with cationic ratios of 3:1 are thermally more stable then the 2:1 and 4:1 structures.
65 citations
TL;DR: The data shows that Ti accumulation for TiO2 NP exposure in Caco-2 cells is crystal structure-dependent, and that the mechanism(s) involves endocytosis of intact particles.
65 citations
TL;DR: The calculations strongly suggest that the halide oxidation may take place with the preliminary formation of a peroxovanadate/halogen adduct and that the hydrogen peroxide binding may not involve an initial protonation of the vanadate cofactor.
Abstract: A quantum mechanics/molecular mechanics study of the resting state of the vanadium dependent chloroperoxidase from fungi Curvularia inaequalis and of the early intermediates of the halide oxidation is reported. The investigation of different protonation states indicates that the enzyme likely consists of an anionic H2VO4- vanadate moiety where one hydroxo group is in axial position. The calculations suggest that the hydrogen peroxide binding may not involve an initial protonation of the vanadate cofactor. A low free energy reactive path is found where the hydrogen peroxide directly attacks the axial hydroxo group, resulting in the formation of an hydrogen peroxide intermediate. This intermediate is promptly protonated to yield a peroxo species. The free energy barrier for the formation of the peroxo species does not depend significantly upon the protonation state of the cofactor. The most likely protonation states of the peroxo cofactor are neutral forms HVO2(O2) with a hydroxo group either H-bonded to Se...
65 citations