ON PRODUCTION POSSIBILITY TITANIUM DIOXIDE POWDER SYNTHESIZED BY DYNAMIC PLAZMA METHOD

These days, environmental pollution problems are relevant, therefore, the problems associated with photocatalysis as a direction for the future development of alternative energy are solved by many world scientists. Titanium dioxide TiO2 is known to be a photocatalytic material with many unique properties. However, its use is limited due to its wide band gap and the high recombination rate of electron pairs. The method of direct plasma dynamic synthesis of dispersed titanium dioxide was proposed. It was established that the synthesized product consisted of two fractions which had different sizes: a coarse fraction with particle sizes from ~10 microns to ~100 microns and a fine one - from ~10 nm to ~1 micron. It was also revealed that fractions mainly consisted of two TiO2 crystalline modifications: anatase and rutile with tetragonal syngony.

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Population Balance Application in TiO2 Particle Deagglomeration Process Modeling

Energies ◽

10.3390/en14123523 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3523

Author(s):

Radosław Krzosa ◽

Łukasz Makowski ◽

Wojciech Orciuch ◽

Radosław Adamek

Keyword(s):

Particle Size ◽

Titanium Dioxide ◽

Mechanistic Model ◽

Population Balance ◽

Tio2 Particle ◽

Application Process ◽

Titanium Dioxide Powder ◽

Dioxide Powder ◽

Computational Fluid Dynamics Cfd ◽

Hydrodynamic Stresses

The deagglomeration of titanium-dioxide powder in water suspension performed in a stirring tank was investigated. Owing to the widespread applications of the deagglomeration process and titanium dioxide powder, new, more efficient devices and methods of predicting the process result are highly needed. A brief literature review of the application process, the device used, and process mechanism is presented herein. In the experiments, deagglomeration of the titanium dioxide suspension was performed. The change in particle size distribution in time was investigated for different impeller geometries and rotational speeds. The modification of impeller geometry allowed the improvement of the process of solid particle breakage. In the modelling part, numerical simulations of the chosen impeller geometries were performed using computational-fluid-dynamics (CFD) methods whereby the flow field, hydrodynamic stresses, and other useful parameters were calculated. Finally, based on the simulation results, the population-balance with a mechanistic model of suspension flow was developed. Model predictions of the change in particle size showed good agreement with the experimental data. Using the presented method in the process design allowed the prediction of the product size and the comparison of the efficiency of different impeller geometries.

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ChemInform Abstract: Heterogeneous Photocatalytic Reactions of Azobenzenes on Titanium Dioxide Powder in Methanolic Solution.

ChemInform ◽

10.1002/chin.198915170 ◽

1989 ◽

Vol 20 (15) ◽

Author(s):

K. SHIBATA ◽

T. MIMURA ◽

M. MATSUI ◽

T. SUGIURA ◽

H. MINOURA

Keyword(s):

Titanium Dioxide ◽

Methanolic Solution ◽

Titanium Dioxide Powder ◽

Dioxide Powder ◽

Photocatalytic Reactions

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Synthesis of Nanosized Brookite-type Titanium Dioxide Powder from aqueous TiOCl2Solution by homogeneous Precipitation Reaction

Korean Journal of Materials Research ◽

10.3740/mrsk.2002.12.12.947 ◽

2002 ◽

Vol 12 (12) ◽

pp. 947-954 ◽

Cited By ~ 1

Keyword(s):

Titanium Dioxide ◽

Precipitation Reaction ◽

Homogeneous Precipitation ◽

Titanium Dioxide Powder ◽

Dioxide Powder

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Study on the Dispersion of Carbon Doped Titanium Dioxide Powder in Aqueous Solution

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.788.246 ◽

2013 ◽

Vol 788 ◽

pp. 246-249 ◽

Cited By ~ 1

Author(s):

Zhi Wang ◽

Zhi Qiang Yang

Keyword(s):

Aqueous Solution ◽

Titanium Dioxide ◽

Ph Value ◽

Mass Ratio ◽

Carbon Doped ◽

Titanium Dioxide Powder ◽

Dioxide Powder ◽

Ultrasonic Time ◽

Dispersant Additive ◽

Doped Titanium Dioxide

The dispersion of carbon doped titanium dioxide (TiO2) powder in aqueous solution was studied. The spectrophotometer method was used to determine the effects of dispersant additive ratio, ultrasonic time and pH value on the dispersion of TiO2. The results show that the carbon doped titanium dioxide aqueous solution was found to have the optimum dispersion performance when the mass ratio of sodium hexametaphosphate (SHMP)/TiO2/water is 1:50:100, the ultrasonic time is 15min and the pH value of the solution is 10.

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Plasma Induced Grafting of PMMA onto Titanium Dioxide Powder

Plasma Science and Technology ◽

10.1088/1009-0630/7/4/019 ◽

2005 ◽

Vol 7 (4) ◽

pp. 2955-2958 ◽

Cited By ~ 6

Author(s):

Zhong Shaofeng ◽

Meng Yuedong ◽

Ou Qiongrong ◽

Xu Xu

Keyword(s):

Titanium Dioxide ◽

Titanium Dioxide Powder ◽

Dioxide Powder

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Titanium Dioxide Nanotube-Based Oxygen Indicator for Modified Atmosphere Packaging: Efficiency and Accuracy

Materials ◽

10.3390/ma11122410 ◽

2018 ◽

Vol 11 (12) ◽

pp. 2410 ◽

Cited By ~ 1

Author(s):

Junwei Wen ◽

Shuting Huang ◽

Yu Sun ◽

Zhengjie Chen ◽

Yixiang Wang ◽

...

Keyword(s):

Titanium Dioxide ◽

Modified Atmosphere Packaging ◽

Wide Band ◽

Crystal Form ◽

Tio2 Nanotube ◽

Hydroxyethyl Cellulose ◽

Modified Atmosphere ◽

Destructive Testing ◽

Wide Band Gap ◽

Pet Film

Colorimetric oxygen indicators can be applied for non-destructive testing in packaging; especially in modified atmosphere packaging (MAP). In this paper; titanium dioxide (TiO2) nanotube; which is used as a semiconductor photocatalyst in oxygen indicators; was synthesized via a microwave-assisted hydrothermal method. X-Ray Diffraction (XRD) was used to analyze its crystal form and Scanning Electron Microscope (SEM).to characterize its morphology. Its properties were studied using Brunauer-Emmett-Teller (BET), Diffuse Reflection Spectrum (DRS), and Bluebottle experiments. The results showed that the synthesized TiO2 nanotube was a mixture of rutile and anatase; with a specific surface area of 190.35 m2/g; and a wide band gap of 3.34 eV. Given the satisfactory performance; the TiO2-based oxygen indicator was prepared and combined with glycerol; methylene blue; and hydroxyethyl cellulose (HEC). The oxygen indicator demonstrated excellent photocatalytic performance and effectively avoided excitation by visible light. We studied the rheological properties; thixotropic properties; and wettability of the indicator. The results demonstrated the printability of the indicator solution; which was then printed in the polyethylene terephthalate (PET) film by screen printing and applied to MAP. The application results showed that the prepared oxygen indicator was able to provide visual support to judge whether the packaging was intact and the food was safe.

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