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Mesoporous P25 titanium dioxide microspheres and preparation method thereof

A technology of titanium dioxide and P25, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problem of incomplete connection interface between rutile and anatase, reduced separation efficiency of photogenerated electrons and holes, and unfavorable material transport and light absorption, to achieve the effects of easy control of reaction conditions, improved separation efficiency, and easy repeatability

Inactive Publication Date: 2017-09-01
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many disadvantages in the commercialized P25 prepared by the gas phase method: 1, the gas phase combustion hydrolysis method is difficult to control, the particle size is irregular, and the accumulation is chaotic, so that the commercialized P25 specific surface area is low (2 / g) and small pore size (< 5 nm), which are not conducive to the transport of substances and the absorption of light in photocatalytic reactions
2. The crystallization of commercialized P25 is incomplete and contains some amorphous titanium dioxide particles, resulting in an incomplete connection interface between rutile and anatase, which cannot form a perfect heterogeneous interface accumulation, which further reduces the separation efficiency of photogenerated electrons and holes.

Method used

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  • Mesoporous P25 titanium dioxide microspheres and preparation method thereof
  • Mesoporous P25 titanium dioxide microspheres and preparation method thereof
  • Mesoporous P25 titanium dioxide microspheres and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Synthesis of Mesoporous Anatase Titanium Dioxide Microspheres

[0026] Dissolve 1.6g of F127 into 32g of tetrahydrofuran or dioxane solution, stir to obtain a uniform solution (5.0 wt %), add 1.0-3.0g of concentrated sulfuric acid, 1.2-3.6g of glacial acetic acid and stir to form a colorless and transparent solution, then add 2.2-4.8g tetrabutyl titanate was stirred for 0.5-6 h, the solution gradually changed from colorless to golden yellow.

[0027] Transfer the solution to an open glass bottle, transfer the glass bottle to an oven at 20-50°C to volatilize for 8-48 hours, further raise the temperature of the oven to 60-150°C, and volatilize for 2-32 hours to obtain a white powder .

[0028] Put the newly prepared sample in a tube furnace, and bake it at 350°C for 2-6 h under a nitrogen atmosphere, with a heating rate of 0.2-10°C / min, to obtain gray-black TiO 2 / C Composite. The obtained sample was calcined in air at 400°C for 2-5 h to remove the carbon in...

Embodiment 2

[0029] Example 2: Synthesis of Mesoporous P25 Titanium Dioxide Microspheres

[0030] Dissolve 1.6g F127 into 32g tetrahydrofuran or dioxane solution, stir to obtain a uniform solution (5.0 wt %), add 1.0-3.0g concentrated hydrochloric acid, 1.2-3.6g glacial acetic acid and stir to form a colorless transparent solution, then add 2.2-4.8g of tetrabutyl titanate was stirred for 0.5-6 h, and the solution gradually changed from colorless to golden yellow.

[0031] Transfer the solution to an open glass bottle, transfer the glass bottle to an oven at 20-50°C to volatilize for 8-48 h, further raise the temperature of the oven to 60-150°C, and volatilize for 2-32 hours to obtain White powder.

[0032] Put the newly prepared sample in a tube furnace, and bake it at 350°C for 2-6 h under a nitrogen atmosphere, with a heating rate of 0.2-10°C / min, to obtain gray-black TiO 2 / C Composite. The obtained samples were calcined in air at 400 °C for 2-5 h to remove the carbon, and the mesopor...

Embodiment 3

[0033] Example 3: Synthesis of Mesoporous Rutile Titanium Dioxide Microspheres

[0034] Dissolve 1.6g of F127 into 32g of tetrahydrofuran or dioxane solution, stir to obtain a uniform solution (5.0 wt%), add 3.0-6.0g of concentrated hydrochloric acid, 3.0-6.0g of glacial acetic acid and stir to form a colorless transparent solution, and then Add 2.2-4.8g tetrabutyl titanate and stir for 0.5-6 h, the solution gradually changes from colorless to golden yellow.

[0035] Transfer the solution to an open glass bottle, transfer the glass bottle to an oven at 20-50°C to volatilize for 8-24 hours, further raise the temperature of the oven to 60-100°C, and volatilize for 2-8 hours to obtain white powder.

[0036] Put the newly prepared sample in a tube furnace, and bake it at 350°C for 2-6 h under a nitrogen atmosphere, with a heating rate of 0.2-10°C / min, to obtain gray-black TiO 2 / C Composite. The obtained sample was calcined in air at 400°C for 2-5 h to remove the carbon in it a...

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Abstract

The invention belongs to the technical field of advanced porous materials, and particularly relates to mesoporous P25 titanium dioxide microspheres and a preparation method thereof. By a solvent evaporation-induced self-assembly method, a commercial amphiphilic triblock copolymer PEO-PPO-PEO is used as a templating agent, organic titanium is used as a titanium source, inorganic acid is used as a titanium dioxide skeleton crystal modifier, a rutile-anatase coexistent skeleton with uniform spherical morphology and divergent mesoporous channels is formed during solvent evaporation, and after the templating agent is removed by roasting, the mesoporous P25 titanium dioxide microspheres are obtained. The mesoporous P25 titanium dioxide microspheres have a large specific surface area and large pore volume; in the skeleton, rutile and anatase are closely packed and the ratio is adjustable, so that the separation efficiency of photogenerated charges and photogenerated holes of a material is significantly improved, and thus the photoelectric conversion efficiency and the efficiency of a reaction for producing hydrogen through photocatalytic water decomposition are greatly improved. The preparation method is simple, a wet preparation process is adopted, raw materials are easy to obtain, and the preparation method is suitable for large-scale production and has a wide application prospect in the fields of environment, energy resources and catalysis and many other fields.

Description

technical field [0001] The invention belongs to the technical field of advanced porous materials, and in particular relates to mesoporous P25 titanium dioxide microspheres and a preparation method thereof. Background technique [0002] Titanium dioxide (TiO 2 ) is an important inorganic functional material, which has the characteristics of high abundance, stable chemical properties, light corrosion resistance, low cost, non-toxicity and excellent semiconductor performance. It has been widely used in the fields of photoelectric conversion and photocatalysis, industrialization and commercialization Titanium dioxide products emerge in endlessly. Titanium dioxide has three crystal phases: anatase, rutile, and brookite. Mixing different crystal phases together to form a heterogeneous interface can improve the separation efficiency of photogenerated electrons and holes, and is considered to be an effective way to improve photocatalysis and photoelectricity. A way to transform pe...

Claims

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Application Information

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IPC IPC(8): C01G23/053B01J21/06B01J35/08B01J35/10
CPCC01G23/053B01J21/063C01P2004/51C01P2004/62C01P2004/64C01P2006/14C01P2006/12C01P2006/17C01P2006/40C01P2002/72C01P2004/03C01P2004/04B01J35/51B01J35/613B01J35/615B01J35/633B01J35/647B01J35/39
Inventor 赵东元张威孔彪李伟刘洋
Owner FUDAN UNIV
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