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1
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Application of recycled natural aluminasilicate doped with vanadium for the decontamination of the air

100%
Marcewicz-Kuba A., Olszewska D.
Polish Journal of Chemical Technology
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2007
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vol. 9
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issue 2
65-67
EN
This paper reports studies on the influence of vanadium concentration on the catalytic activity of DESONOX catalysts (in DESOX reaction) based on modified montmorillonite from Jelsovy Potok. The investigation of the influence on the physicochemical properties of the catalysts on their behaviour has also been studied.
2
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Determination of vanadium content in soils by slurry sampling electrothermal atomic absorption spectrometry using KO300G as the stabilizing agent

100%
Barałkiewicz D., Gramowska H., Ren K., Mleczek M.
Open Chemistry
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2006
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vol. 4
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issue 2
363-374
EN
A direct and sensitive method for the determination of vanadium concentrations in soil is developed using ultrasonic slurry sampling electrothermal atomic absorption spectrometry (USSSETAAS). The surfactant, KO300G, is used as the stabilizing agent. The precision and accuracy of the method are investigated. The detection limits are 0.6 and 0.7 µg 1−1 for SRM Montana Soil 2711 and SRM Soil - S, respectively. The method is applied to determine the vanadium content in 10 soil samples from the Wielkopolska region.
3
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Extraction of vanadium compounds from the used vanadium catalyst with the potassium hydroxide solution

75%
Mazurek K., Białowicz K., Trypuć M.
Polish Journal of Chemical Technology
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2010
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vol. 12
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issue 1
23-28
EN
The paper presents the results of the research on the degree of the recovery of vanadium(V) from the used vanadium catalyst with the use of KOH solution. The extraction was performed at 293 - 323 K, for 0.5 to 4 h and the catalysts of the variable grain diameter. The concentration of the extracting solution was varied in the range 5 - 20%. The optimal ratio of solid to liquid phase S/L was determined. Additionally the degree of the recovery of total iron ions was presented.
4
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Effects of Adding Niobium and Vanadium to Fe-Based Oxide Dispersion Strengthened Alloy

75%
Park C. W., Byun J., Choi W. J., Kim Y. D., Park C. W., Byun J., Choi W. J., Kim Y. D.
Archives of Metallurgy and Materials
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2020
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vol. 65
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issue 4
5
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Separation and Immobilization of Vanadium from Industrial Fly Ash as an Insoluble Inorganic Pigment

75%
Kwolek P., Czubajewski K., Wojnicki M., Kwolek P., Czubajewski K., Wojnicki M.
Archives of Metallurgy and Materials
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2020
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vol. 65
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issue 2
6
Content available remote

Large scale multi-configuration Hartree-Fock calculation of the hyperfine structure of the ground state of vanadium

75%
Scharf O., Gaigalas G.
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EN
The hyperfine structure of the ground state of vanadium, 51VI, is calculated in the nonrelativistic framework of the multi-configuration Hartree-Fock approximation. A configuration state function limiting algorithm is used to make the calculations feasible and to study the influence of core, valence and core-valence correlations in detail. The obtained configuration state function space captures the most important orbital correlations within 2%. Further correlations are included through configuration interaction calculation. The atomic state functions are used to evaluate the magnetic dipole hyperfine factor A and the electric quadrupole factor B. It turns out that the ab initio calculation can not capture the core polarization of the 2s shell. It introduces an error that is higher than the Hartree-Fock approximation. However, the detailed correlations being observed suggest the introduction of a wrong correlation orbital due to the algorithm being used. Neglecting this orbital leads to good agreement with 2% deviation from the experimental values for the A factors.
7
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Structural properties of transparent Ti-V oxide semiconductor thin films

75%
Sieradzka K., Kaczmarek D., Morgiel J., Domaradzki J., Prociow E., Adamiak B.
Open Physics
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2013
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vol. 11
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issue 2
251-257
EN
Transparent oxide semiconducting thin films based on mixed Ti-V oxides were prepared using a modified reactive magnetron sputtering method. Based on structural investigations performed with the help of x-ray diffraction and transmission electron microscopy analysis, two distinct regions in the prepared thin film have been observed: a nanocrystalline TiO2-V2O3-V2O5 mixed composition, and a thin layer consisting of amorphous phase and nanocystalline TiO2 phase deposited directly at the substrate. Optical measurements show excellent transmission in the visible spectral range of 73%, on average. Resistivity of the thin film was found at the order of 105 Ω cm at room temperature. The preparation of mixed Ti-V oxides provides a combination of high transparency and semiconducting properties.
8
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Biochemical and medical importance of vanadium compounds

75%
Korbecki J., Baranowska-Bosiacka I., Gutowska I., Chlubek D.
Acta Biochimica Polonica
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2012
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vol. 59
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issue 2
195-200
EN
Vanadium belongs to the group of transition metals and is present in the air and soil contaminants in large urban agglomerations due to combustion of fossil fuels. It forms numerous inorganic compounds (vanadyl sulfate, sodium metavanadate, sodium orthovanadate, vanadium pentoxide) as well as complexes with organic compounds (BMOV, BEOV, METVAN). Depending on the research model, vanadium compounds exhibit antitumor or carcinogenic properties. Vanadium compounds generate ROS as a result of Fenton's reaction or of the reaction with atmospheric oxygen. They inactivate the Cdc25B2 phosphatase and lead to degradation of Cdc25C, which induces G2/M phase arrest. In cells, vanadium compounds activate numerous signaling pathways and transcription factors, including PI3K-PKB/Akt-mTOR, NF-κB, MEK1/2-ERK, that cause cell survival or increased expression and release of VEGF. Vanadium compounds inhibit p53-dependent apoptosis and promote entry into the S phase of cells containing functional p53 protein. In addition, vanadium compounds, in particular organic derivatives, have insulin-mimetic and antidiabetic properties. Vanadium compounds lower blood glucose levels in animals and in clinical trials. They also inhibit the activity of protein tyrosine phosphatase 1B. By activating the PI3K-PKB/Akt pathway, vanadium compaunds increase the cellular uptake of glucose by the GLUT4 transporter. The PKB/Akt pathway is also used to inactivate glycogen synthase kinase-3. The impact of vanadium compounds on inflammatory reactions has not been fully studied. Vanadium pentoxide causes expression of COX-2 and the release of proinflammatory cytokines in a human lung fibroblast model. Other vanadium compounds activate NF-κB in macrophages by activating IKKβ.
9
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Extraction of vanadium and potassium compounds from the spent vanadium catalyst from the metallurgical plant

51%
Mazurek K.
Polish Journal of Chemical Technology
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2012
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vol. 14
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issue 2
49-53
EN
A spent vanadium catalyst, from the plant of metallurgical type, was leached in a sulfuric acid solution to recover vanadium and potassium compounds. The effect of time, temperature, concentration of acid, catalyst particle size and phase ratio was studied. Additionally the concentration of iron, copper, zinc, arsenic and lead compounds was determined. The flow sheet for the proposed process of spent vanadium catalyst leaching is presented.
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