Microwave-assisted chloride process for the production of titanium dioxide

Berestenko, V. I.; Торбов, В. И.; Chukalin, V. I.; Kurkin, E. N.; Balikhin, I. L.; Домашнев, И. А.; Troitskii, V. N.; Gurov, S. T.

doi:10.1134/s001814391105002x

Cited by 6 publications

(7 citation statements)

References 5 publications

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“…7) indicating a very good simulation using first order dynamics. The pseudo first order rate constants of the reactions in the presence of Ag-TiO 2 , TiO 2 and ratio of these values are 0.012 and 0.00038 min -1 , respectively. Discrepancy between the pseudofirst order reaction rate constants may be due to different photocatalytic degradation mechanisms and/or to a competition for degradation between the reactant and the intermediate products.…”

Section: Resultsmentioning

confidence: 98%

“…Photocatalytic using titania (TiO 2 ) provides a via ble route for degradation of organic and inorganic pol lutants in air and water due to its high oxidizing capac ity, photostability and nontoxicity [1][2][3]. Nonetheless, TiO 2 exhibits photoresponse only to UV light due to its wide band gap (3.0-3.2 eV), which impedes the effec tive usage of solar illumination in practical applica tions.…”

Section: Introductionmentioning

confidence: 99%

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Improved visible light photocatalytic activity of titania loaded with silver on discoloration of a heterocyclic aromatic chemical dye solution

Zhang

2012

Russ. J. Phys. Chem.

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The photocatalytic activity of silver deposited Degussa P25 titanium dioxide (Ag DP25) in the photodegradation of methylene blue (MB) was investigated. The as prepared materials were characterized by X ray diffraction (XRD), transmission electron microscopy (TEM), UV vis diffuse reflectance spectroscopy (DRS), infrared spectra and surface photovoltage spectroscopy (SPS) techniques. The obtained results show that the silver dopant could effectively inhibit the recombination of the photoinduced electron and holes, improving the absorption capability for visible light of photocatalyst and leading to increased surface OH group density. The degradation experiment reveals that the catalytic property of Ag DP25 in the degradation of MB dye is more efficient than that of commercially available Degussa P25 TiO 2 (DP25) samples under vis ible light irradiation. Besides, degradation kinetics of MB dye can, be well described by Langmuir-Hinshel wood equation and shows pseudo first order law.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Improved visible light photocatalytic activity of titania loaded with silver on discoloration of a heterocyclic aromatic chemical dye solution

Zhang

2012

Russ. J. Phys. Chem.

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“…where S BET is the area of the specific surface of the powder sample and ρ is the density of the powder material (density of crystal variants of titania: rutile R 4.23 g/ cm 3 and anatase A 4.05 g/cm 3 ).…”

Section: Characterization Of the Titania Powdermentioning

confidence: 99%

“…The photocatalytic activity of the resultant product was compared with the commercial titania powder P-25; the analysis revealed a satisfactory quality of the synthesized powder. Berestenko et al [3] described some regular features associated with particle synthesis in a plasmachemical reactor with production rate up to 0.12 kg/h. They demonstrated that the particle size in the range of 50-100 nm can be controlled.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Study of the Synthesis of Ultrafine Titania Powder in Plasmachemical Flow-Type Reactor

Kartaev

Lukashov

Vashenko

et al. 2014

International Journal of Chemical Reactor Engineering

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Methods for controlling the synthesis of the submicron (including nanosized) powder of titanium dioxide (titania, TiO 2 ) in a setup with a plasmachemical flow reactor were investigated. The synthesis of titania particles from gaseous titanium tetrachloride (TiCl 4 ) in the plasmachemical reactor by the chloride method was experimentally studied. The processes of formation and growth of particles depending on the type of the plasmaforming gas, flow rates of TiCl 4 ; and the quenching gas (air), reactor length, and mean-mass temperature in the reaction zone were considered. When using nitrogen as heat-carrying gas, a new approach of titania powder synthesis based on combining of reaction zone and quenching zone has been applied. Under these nonequilibrium conditions and substantial temperature gradients, this method enabled us to synthesize reproducibly ultrafine titania powders (30-50 nm) with a high content (80-87%) of metastable anatase crystal lattice. The results reveal that the powder properties can be efficiently controlled, i.e., one setup can produce titania with a required particle size and a type of the crystal lattice: anatase (A) or rutile (R). The experimental data are found to agree well with the results of numerical calculations.

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Micropolar effects on the effective shear viscosity of nanofluids

Bondarenko,

Bukichev,

Dzhaga

et al. 2024

Physics of Fluids

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The modified size-dependent Einstein's and Brinkman's solutions are established for the effective shear viscosity of rigid particle suspensions taking into account the micropolar effects in the base fluid. Solutions are obtained based on the homogenization approach and allow us to take into account the influence of the particle size. Two non-classical parameters arise in the considered micropolar solutions: the length scale parameter and the coupling (micropolarity) number of the base fluid. The solutions developed are validated using tests performed with polydimethylsiloxane based TiO2 nanofluids as well as other published data on the size-dependent shear viscosity of different nanofluids. Good agreement between the predictions and the experimental data is established across a wide range of volume fractions and size of nanoparticles. The possibility for unique identification (at given temperature) of the micropolar parameters of the base fluids is shown. Temperature-dependent values of non-classical rotational and spin viscosities of polydimethylsiloxane, ethylene glycol, and water are evaluated.

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Microwave-assisted chloride process for the production of titanium dioxide

Cited by 6 publications

References 5 publications

Improved visible light photocatalytic activity of titania loaded with silver on discoloration of a heterocyclic aromatic chemical dye solution

Improved visible light photocatalytic activity of titania loaded with silver on discoloration of a heterocyclic aromatic chemical dye solution

An Experimental Study of the Synthesis of Ultrafine Titania Powder in Plasmachemical Flow-Type Reactor

Micropolar effects on the effective shear viscosity of nanofluids

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