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Preparation method of titanium dioxide coated iron trioxide hollow sphere

A technology of ferric oxide and titanium dioxide, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of low photon efficiency, short hole life, narrow hole Bandwidth and other issues

Inactive Publication Date: 2013-04-17
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002]Because of the advantages of nano-TiO2 in chemical stability, wear resistance, low cost and direct use of sunlight, it is used in Photoelectric conversion, chemical synthesis, and photocatalytic oxidation of environmental pollutants have broad application prospects, but due to the wide band gap of TiO2 photocatalyst (Eg=3.2 eV, λ=387 nm), only Under the ultraviolet excitation of λ2 to make TiO The response spectrum of sub> extends to visible light, and effectively inhibits the recombination of electrons and holes, improving the photocatalytic efficiency of nano-TiO2
[0003]Transition metal ion doping can introduce defect sites in the TiO2 lattice or change the crystallinity, thereby affecting the recombination of electrons and holes , at the same time, it is possible to form a doping energy level to expand the range of light absorption wavelengths. As a semiconductor material, Fe2O3 has a narrow band gap (Eg= 2.2 eV, λ=563 nm), its absorption spectrum matches the solar spectrum, and it can directly use solar energy; however, the lifetime of Fe2O3 holes is short and easy to Photocorrosion occurs, so the advantages of Fe2O3 and TiO2 are combined, and Fe3+ or Fe2O3modified TiO2 has become a research hotspot in recent years

Method used

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  • Preparation method of titanium dioxide coated iron trioxide hollow sphere
  • Preparation method of titanium dioxide coated iron trioxide hollow sphere
  • Preparation method of titanium dioxide coated iron trioxide hollow sphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve 6 g of glucose in 40 mL of deionized water to form a solution with a mass concentration of 0.15 g / mL, transfer the solution into a reaction kettle for hydrothermal reaction at a temperature of 180 °C, and a reaction time of 6 h, then centrifuge and dry to obtain Carbon sphere template; Dissolve 0.82 g of ferric chloride in a mixed solution of 56 mL of absolute ethanol and deionized water, wherein the volume ratio of absolute ethanol and deionized water is 6: 1, and dissolve 1.8 g of urea in the above solution , stirred until dissolved, added 0.3 g carbon sphere template to the above solution, mixed evenly, transferred to an oven at 60°C for 48 hours, and was centrifuged and dried. The resulting sample was calcined at 450 °C for 2 hours to remove the carbon sphere template and obtain Fe 2 o 3 Hollow sphere, to present embodiment product (Fe 2 o 3 Hollow sphere) to observe its microscopic morphology by transmission electron microscopy, the results are as follo...

Embodiment 2

[0020] Dissolve 8 g of glucose in 40 mL of deionized water to form a solution with a mass concentration of 0.2 g / mL, transfer the solution into a reactor for hydrothermal reaction at a temperature of 160 °C, and a reaction time of 8 h, then centrifuge and dry to obtain Carbon sphere template; Dissolve 0.82 g of ferric chloride in a mixed solution of 56 mL of absolute ethanol and deionized water, wherein the volume ratio of absolute ethanol and deionized water is 6: 1, and dissolve 1.8 g of urea in the above solution , stirred until dissolved, added 0.3 g carbon sphere template to the above solution, mixed evenly, transferred to an oven at 60°C for 48 hours, and centrifuged to dry. The obtained sample was calcined at 500°C for 2 hours to remove the carbon sphere template to obtain Fe 2 o 3 Hollow sphere, size and structure are similar to the results obtained in Example 1.

Embodiment 3

[0022] 0.48 g of the sample prepared in Example 1 without heat treatment was dispersed in a mixed solution of 56 mL of absolute ethanol and deionized water, wherein the volume ratio of absolute ethanol and deionized water was 6: 1; 0.35 mL Tetrabutyl titanate was added to the above solution, so that the molar ratio of titanium ions to iron ions was 1: 2, stirred evenly, the solution was kept in an oven at 60°C for 48 hours, and dried by centrifugation, and the obtained sample was roasted at 450°C for 2 Hours, obtained titanium dioxide-coated ferric oxide hollow spheres, the product of this example (titanium dioxide-coated ferric oxide hollow spheres) X-ray powder diffraction results are as follows figure 2 As shown, the mark * in the figure is the characteristic peak of titanium dioxide, and ? is the characteristic peak of ferric oxide, and the prepared samples simultaneously appear Fe 2 o 3 and TiO 2 The characteristic peak, and consistent with the standard PDF card, the ...

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Abstract

The invention discloses a preparation method of a titanium dioxide coated iron trioxide hollow sphere. The preparation method comprises the following steps: using a carbon sphere as a template and synthesizing iron trioxide at lower temperature by using perchloride iron as an iron source; and then, using tetrabutyl titanate as a titanium source to synthesize the iron trioxide hollow sphere. The method provided by the invention is simple and mild and low in reaction temperature, and the thickness of a titanium dioxide coating can be adjusted by changing the addition of tetrabutyl titanate.

Description

technical field [0001] The invention relates to an inorganic semiconductor composite material, in particular to a preparation method of titanium dioxide-coated ferric oxide hollow spheres. Background technique [0002] Due to nano TiO 2 It has the advantages of good chemical stability, wear resistance, low cost, and direct use of sunlight, and has broad application prospects in photoelectric conversion, chemical synthesis, and photocatalytic oxidation of environmental pollutants. However, due to the 2 The photocatalyst has a wide band gap (Eg=3.2 eV, λ=387 nm), and only under the excitation of ultraviolet light of λ<387 nm, the valence band electrons can jump to the conduction band to form photogenerated electrons and holes. The recombination of generated electrons and holes leads to very low photon quantum efficiency. In order to overcome these shortcomings, people have conducted a lot of in-depth research on improving its visible light catalytic activity and catalytic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J35/08
Inventor 唐华李小磊杨小飞李长生李洪苹
Owner JIANGSU UNIV
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