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Preparation method of nano-titanium dioxide/γ-alumina composite powder

A technology of nano-titanium dioxide and composite materials, applied in the field of nano-material preparation, can solve the problems of mass production limitations of composite materials, poor mixing of two materials, and uncontrollable particle size, etc., to achieve excellent photocatalytic performance and process controllable , equipment cost and raw material cost are low

Active Publication Date: 2022-02-18
HENAN UNIV OF SCI & TECH
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  • Summary
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  • Description
  • Claims
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Problems solved by technology

[0004] However, the spray pyrolysis and spin coating methods commonly used in the prior art have the disadvantages of high cost, cumbersome steps, and inconvenient operation, making TiO 2 / γ-Al 2 o 3 High-volume production of composite materials is limited
At the same time, the TiO prepared by the above method 2 / γ-Al 2 o 3 Composite materials also have disadvantages such as uncontrollable particle size, poor particle dispersion, high content of introduced impurities, poor mixing of two materials, and easy agglomeration of particles of the same material.

Method used

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  • Preparation method of nano-titanium dioxide/γ-alumina composite powder

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preparation example Construction

[0035] A kind of TiO 2 / γ-Al 2 o 3 The preparation method of nanocomposite material powder, comprises the following steps:

[0036] Step 1. After taking aluminum nitrate and adding it into distilled water and fully stirring, adding absolute ethanol to continue stirring, and then adding ammonium citrate and stirring vigorously to obtain the raw material of the reaction solution, which is set aside;

[0037] In this step, the volume ratio of distilled water and absolute ethanol is 1:1. The γ-AlOOH nanoparticles produced by hydrothermal treatment have the best sphericity. Finally, ammonium citrate is added and fully mixed at a speed of 1200r / min. Aluminum nitrate and lemon The molar ratio of ammonium acid is (3~4):1, and the pore distribution of γ-AlOOH microspheres generated under this ratio is more uniform.

[0038] Step 2. Transfer the raw materials of the reaction solution obtained in step 1 into a stainless steel hydrothermal kettle with a polytetrafluoroethylene lining. ...

Embodiment 1

[0050] A kind of nano TiO 2 / γ-Al 2 o 3 The preparation method of composite material powder, comprises the following steps:

[0051] Step 1: After taking 2mmol of aluminum nitrate and adding 20ml of distilled water to fully stir, add 20ml of absolute ethanol to continue stirring, then add 0.5mmol of ammonium citrate, and mix and stir at a stirring speed of 1200r / min for 12min to obtain a pretreatment solution for later use ;

[0052] Step 2. Transfer the pretreatment solution obtained in step 1 to a stainless steel hydrothermal kettle lined with polytetrafluoroethylene. After that, put the hydrothermal kettle into a drying oven, and control the drying oven at a temperature of 3° C. / min. The heating rate was raised to 200 °C, and the hydrothermal reaction was carried out for 24 hours to obtain the hydrothermal product, which was set aside;

[0053] Step 3. Stir and suction filter the hydrothermal product obtained in step 2, take the filter residue, and then wash the obtaine...

Embodiment 2

[0061] A kind of nano TiO 2 / γ-Al 2 o 3 The preparation method of composite material powder, comprises the following steps:

[0062] Step 1: After taking 2mmol of aluminum nitrate and adding 20ml of distilled water to fully stir, add 20ml of absolute ethanol and continue to stir, then add 0.66mmol of ammonium citrate, and mix and stir at a stirring speed of 1000r / min for 15min to obtain a pretreatment solution for later use ;

[0063] Step 2. Transfer the pretreatment solution obtained in step 1 to a stainless steel hydrothermal kettle with polytetrafluoroethylene lining. After that, put the hydrothermal kettle into a drying oven, and control the drying oven at a temperature of 5 °C / min. The heating rate is raised to 150°C, and the hydrothermal reaction is carried out for 15 hours to obtain the hydrothermal product, which is set aside;

[0064] Step 3. Stir and suction filter the hydrothermal product obtained in step 2, take the filter residue, and then wash the obtained f...

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Abstract

Nano-TiO 2 / γ‑Al 2 o 3 The preparation method of composite material powder, which adopts unique process fine control, and prepares nano-scale particles through simple steps, TiO 2 and γ‑Al 2 o 3 The nanoparticles of the two materials are uniformly mixed, entangled, and intertwined, and the mesoporous γ‑Al 2 o 3 The unique void structure can provide confining stress after TiO nucleation, effectively hindering the TiO 2 Grain growth and particle agglomeration, and TiO with good dispersion 2 / γ‑Al 2 o 3 Composite powder. Prepared finished nano-TiO 2 / γ‑Al 2 o 3 Good dispersion of composite powder particles, TiO 2 The particle size is less than 20nm, high purity, TiO 2 Particles and γ‑Al 2 o 3 The uniformity of the mixed texture of the particles is high, which avoids the problem of particle agglomeration of the same material, and makes the product have excellent photocatalytic performance.

Description

technical field [0001] The invention relates to the technical field of preparation of nanomaterials, in particular to a nano-TiO 2 / γ-Al 2 o 3 The invention relates to a method for preparing composite material powder, which belongs to a technical application of preparing composite powder by hydrothermal method. Background technique [0002] TiO 2 Because of its strong oxidation ability, high photocatalytic activity, and stable physical and chemical properties, it is widely used in the fields of air purification, wastewater treatment, sterilization and self-cleaning. But TiO 2 In the photocatalytic reaction, there are problems such as low quantum efficiency, poor utilization of sunlight, high recombination probability of photogenerated carriers, difficult recycling, and low recycling rate, which limit its industrialization process. [0003] Mesoporous γ-Al 2 o 3 It is a porous core / shell microsphere with simple preparation method and low cost. It has high density, uni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J35/08B01J37/08
CPCB01J35/004B01J21/063B01J37/088B01J37/086B01J35/08
Inventor 潘昆明魏世忠王飞鸿赵阳徐流杰李继文张国赏陈冲周玉成李秀青张程毛丰
Owner HENAN UNIV OF SCI & TECH
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