Production of TiO2/Cr2O3 Composite Material in the Spherical Form

2019 ◽  
pp. 124-133
Author(s):  
A.O. Rogacheva ◽  
O.S. Khalipova ◽  
A.S. Brichkov ◽  
V.V. Kozik
Keyword(s):  
Thermal Analysis ◽  
Composite Material ◽  
Spectral Analysis ◽  
Sol Gel ◽  
Organic Polymer ◽  
Template Method ◽  
Ion Exchange Resins ◽  
Spherical Form ◽  
X Ray ◽  
Exchange Resins

Spherical TiO2/Cr2O3 oxides composites were obtained by template method accompanied with sol-gel method. Ion exchange resins of spherical form (TOKEM-100 and TOKEM-250) were used as an organic polymer matrix. Thermal analysis, X-ray phase analysis and micro-X-ray spectral analysis were used to identify the formation process and compositions of oxides composites. The formation of spherical oxide composite ends at 400 °C and the final products are a mixture of two oxides: Cr2O3 and TiO2 regardless of the structure of the used template. According SEM data prepared TiO2/Cr2O3 composites have spherical form and the size of sphere found to be in a range from 300 to 870 µm.

Luminescent Properties of Zn2SiO4:Eu3+,Dy3+ Phosphors via Sol-Gel Process

2012 ◽  
Vol 217-219 ◽  
pp. 733-736
Author(s):  
Xiu Mei Han ◽  
Shu Ai Hao ◽  
Ying Ling Wang ◽  
Gui Fang Sun ◽  
Xi Wei Qi
Keyword(s):  
Thermal Analysis ◽  
Ir Spectra ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sol Gel Process ◽  
Ft Ir

Zn2SiO4:Eu3+, Dy3+ phosphors have been prepared through the sol-gel process. X-ray diffraction (XRD), thermogravimetric and ddifferential thermal analysis (TG-DTA), FT-IR spectra and photoluminescence spectra were used to characterize the resulting phosphors. The results of XRD indicated that the phosphors crystallized completely at 1000oC. In Zn2SiO4:Eu3+,Dy3+ phosphors, the Eu3+ and Dy3+ show their characteristic red(613nm, 5D0-7F2), blue (481nm, 4F9/2–6H15/2) and yellow (577nm, 4F9/2–6H13/2) emissions.

Synthesis of Novel Vanadium Oxide Nanotubes and Nanofibers

2002 ◽  
Vol 740 ◽  
Author(s):  
Samuel T. Lutta ◽  
Hong Dong ◽  
Peter Y. Zavalij ◽  
M. Stanley Whittingham
Keyword(s):  
Thermal Analysis ◽  
Vanadium Oxide ◽  
Electrochemical Behavior ◽  
Redox Reactions ◽  
Sol Gel ◽  
Vanadium Oxides ◽  
Organic Polymer ◽  
Fibrous Morphology ◽  
Surfactant Templates ◽  
Vanadium Oxide Nanotubes

ABSTRACTWe are exploring the synthesis and properties of structured vanadium oxides mainly nanotubes and nanorods. Nanotubes initially formed with surfactant templates have been readily exchanged with simple cations without change of the basal-plane structure. These compounds contain d-like vanadium oxide layers with the vanadium in VO6 octahedra. This structure is particularly suitable for redox reactions. In this paper we report on synthesis of vanadium oxide, (NH4)xV2O5-d·nH2O rods using organic polymer as template. This compound has been synthesized by sol-gel reaction and subsequent hydrothermal treatment. TGA, SEM, XRD and FTIR were used to characterize this compound. Thermal analysis of this compound shows that the fibrous morphology is maintained when it is heated in nitrogen and oxygen above 300 °C. However, in both cases the size of the fibers decreases. Performance of this compound as cathode material in secondary electrolyte has been investigated using LiPF6 as electrolyte. A capacity of 140 mAh/g was obtained which remained fairly constant with up to at least 10 cycles. We also investigated electrochemical behavior of thermal products.

Study on the Synthesis of Nano-Crystalline Mg2SiO4 Powders by Aqueous Sol-Gel Process

2013 ◽  
Vol 538 ◽  
pp. 142-145 ◽  
Author(s):  
X.F. Chen ◽  
J. Li ◽  
T.T. Feng ◽  
Y.S. Jiang ◽  
X.H. Zhang ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Sol Gel ◽  
Magnesium Nitrate ◽  
Metal Alkoxides ◽  
X Ray Diffraction ◽  
Calcination Process ◽  
X Ray ◽  
Nano Crystalline ◽  
Sol Gel Process ◽  
Scanning Electron

The forsterite-structure Mg2SiO4 was successfully synthesized by the aqueous sol-gel method using Si sols dioxide and magnesium nitrate as starting materials instead of expensive organic solvent and metal alkoxides. The as-prepared nanopowders were characterized by X-ray diffraction (XRD), differential thermal analysis (DTA) and scanning electron microscope (SEM), respectively. The results showed that the calcination process of gel consisted of a series of oxidation and combustion reactions, accompanied by significantly exothermal effects. Highly reactive nanosized Mg2SiO4 powders were successfully obtained at 850 °C with particle size of 60~80 nm.

Synthesis and Characterization of Ti, Fe-Doped Mullite-I

2011 ◽  
Vol 217-218 ◽  
pp. 163-168 ◽  
Author(s):  
Lin Xin Tong ◽  
Jin Hong Li ◽  
Jian Cao
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Phase Separation ◽  
Powder Diffraction ◽  
Sol Gel ◽  
Synthesis And Characterization ◽  
Formation Temperature ◽  
Gel Method ◽  
X Ray

A series of gels with 3Al2O3•2SiO2 were prepared by Sol-gel method and heated at several temperatures for 2 h to synthesize Ti, Fe-doped mullite. The powers were characterized by differential thermal analysis (DSC-TG) and X-ray powder diffraction (XRD). Phase separation was promoted by doping both TiO2 and Fe2O3; with increasing the amount of dopant ions the formation temperature of Si-Al spinel decreased and the formation temperature of mullite increased by TiO2 doping but decreased by Fe2O3 doping. The formation temperature of pure mullite was about 1250-1350 °C.

Surfactants Effect on the Photoactivity of Fe-Doped TiO2

2013 ◽  
Vol 743-744 ◽  
pp. 367-371 ◽  
Author(s):  
Qing Yun Chen ◽  
Chao Xue ◽  
Xiang Lin Li ◽  
Yun Hai Wang
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Preparation Process ◽  
X Ray Diffraction ◽  
Sunlight Irradiation ◽  
X Ray ◽  
Degradation Ratio ◽  
Scanning Electron

Ti (OC4H9)4 was used as the Ti precursor and titanium dioxide (TiO2) was prepared by sol-gel method. During the preparation process, Fe3+ was doped and different surfactants, such as SDS, PEG, CTAB, were added to improve the photocatalytic activity of TiO2. The effect of the different type of surfactants on the structure of Fe-doped TiO2 was discussed. The photocatalysts were characterized by thermogravimetric thermal analysis, X-ray diffraction, scanning electron microscopy and UV-Vis spectrophotometer. The red shift of the absorption edge of the Fe-doped TiO2 prepared by using different surfactants was observed. Methyl orange (MO) solution was degraded under sunlight irradiation to evaluate the photocatalytic performance. The results indicated that the photocatalyst prepared with PEG addition had the highest activity and MO degradation ratio could reach 90% after 4 hours irradiation with the best photocatalyst.

scholarly journals X-Ray and Thermal Studies on ZnxMg1-xSO4.7H2O Crystals

2010 ◽  
Vol 7 (s1) ◽  
pp. S121-S126 ◽  
Author(s):  
P. Sumithraj Premkumar ◽  
X. Sahaya Shajan
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Spectral Analysis ◽  
Atomic Absorption ◽  
Single Crystals ◽  
Thermal Studies ◽  
Mixed Crystals ◽  
Slow Evaporation ◽  
X Ray ◽  
Evaporation Method

Single crystals of pure and mixed ZnSO4.7H2O and MgSO4.7H2O crystals were grown by slow evaporation method. The grown crystals were characterized byx-ray diffraction, atomic absorption spectral analysis and thermal analysis. The lattice parameters were calculated by from the XRD data. Atomic absorption spectral analysis showed that the Mg and Zn atoms were present in the mixed crystals. The thermal analysis by TGA and DTA showed that the mixed crystals have higher thermal stability than the pure crystals.

Influence of Heat Treatment on the Structure and Performance of ATP and its Catalyzer

2011 ◽  
Vol 295-297 ◽  
pp. 1510-1515 ◽  
Author(s):  
Yue Bin Lin ◽  
Chun Bo Li ◽  
Yu Fu Zhu ◽  
Ai Hui Liu
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Spectroscopic Analysis ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Treatment Conditions ◽  
Transmission Electron ◽  
Crystal Transition ◽  
And Performance

Taking Attapulgite Clay(ATP) as a carrier, TiO2/ATP precursor was prepared by acid sol-gel method, and then made its composite under different heat-treatment conditions. The structures, dimensions, compositions of the composite are characterized by X-Ray diffraction, transmission electron microscope, thermogravimetric-differential thermal analysis and spectroscopic analysis measurements, respectively. the results show that TiO2/ATP composite increase the crystal transition temperature of TiO2, rutile TiO2emerge in the composite until 800°C, ATP lost its layer constructure and collapse at 850°C.

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