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Preparation method of titanium dioxide for air purification

A technology of titanium dioxide and air purification, applied in catalyst activation/preparation, chemical instruments and methods, separation methods, etc., can solve the problems of poor stability of nanoparticles and cumbersome doping process, and achieve high visible light absorption efficiency and specific surface area Large and stable effect

Inactive Publication Date: 2020-05-08
西安格帆科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of the traditional Fe / N-doped titanium dioxide nanopowder preparation method, the doping process is cumbersome, and the stability of the final nanoparticle is not good, the application provides a preparation method of titanium dioxide for air purification, including Follow the steps below:

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  • Preparation method of titanium dioxide for air purification
  • Preparation method of titanium dioxide for air purification
  • Preparation method of titanium dioxide for air purification

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preparation example Construction

[0025] In order to solve the problem of the traditional Fe / N-doped titanium dioxide nanopowder preparation method, the doping process is cumbersome, and the stability of the final nanoparticle is not good, the application provides a preparation method of titanium dioxide for air purification, including Follow the steps below:

[0026] Step 1. Synthesis of aldylated sodium alginate: Sodium alginate is dissolved in distilled water to obtain a solution with a concentration of 0.5% to 3%, and then an aqueous solution of sodium periodate with a concentration of 0.01 to 1mol / L is added for oxidation reaction After the reaction, excess ethylene glycol was added, kept for 2-6 hours, dialyzed and freeze-dried to obtain alginate sodium alginate.

[0027] Step 2. Synthesis of hydrazinated sodium alginate: dissolve the alginated sodium alginate obtained in step 1 in water to obtain a solution with a mass percent concentration of 2% to 15%, and then add 5 to 40 times the amount of aldehyde...

Embodiment 1

[0041] A preparation method of titanium dioxide for air purification, comprising the steps of:

[0042] Step 1, the synthesis of alginate sodium alginate: sodium alginate (molecular weight 2000-500000Da) is dissolved in distilled water to obtain a solution with a concentration of 0.5%, and then add a sodium periodate aqueous solution with a concentration of 0.01mol / L, seaweed The molar ratio of sodium acid repeat unit to sodium periodate is 1:0.05; the oxidation reaction is carried out at room temperature and pH=5 for 2 hours; after the reaction is completed, excess ethylene glycol is added and kept for 2 hours for dialysis, Freeze-dry to obtain alginate sodium alginate.

[0043] Step 2, the synthesis of hydrazinated sodium alginate: Dissolve aldylated sodium alginate in water to obtain a solution with a mass percentage concentration of 2%, then add hydrazine hydrate with 5 times the amount of aldehyde groups, react for 10 minutes, and divide Add sodium borohydride solution w...

Embodiment 2

[0047] A preparation method of titanium dioxide for air purification, comprising the steps of:

[0048] Step 1, the synthesis of alginate sodium alginate: sodium alginate (molecular weight 2000-500000Da) is dissolved in distilled water to obtain a solution with a concentration of 1.5%, and then adding a concentration of 0.5mol / L sodium periodate aqueous solution, seaweed The molar ratio of sodium acid repeating unit to sodium periodate is 1:0.2; the oxidation reaction is carried out at room temperature and pH=7 for 10 hours; after the reaction is completed, excess ethylene glycol is added and kept for 4 hours for dialysis, Freeze-dry to obtain alginate sodium alginate.

[0049] Step 2, the synthesis of hydrazinated sodium alginate: Dissolve aldylated sodium alginate in water to obtain a solution with a mass percent concentration of 9%, then add hydrazine hydrate with 22 times the amount of aldehyde groups, react for 2 hours, and divide Add sodium borohydride solution with 5 t...

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Abstract

The invention discloses a preparation method of titanium dioxide for air purification. The method comprises the following steps: oxidizing sodium alginate by using a sodium periodate oxidation technology to obtain dialdehyde alginic acid; then reacting the dialdehyde alginic acid with hydrazine to generate hydrazinated sodium alginate; and then, adding a titanium potassium oxalate solution and a ferrous chloride solution, and carrying out a hydrothermal reaction and calcination to obtain the titanium dioxide for air purification. N-containing macromolecules are combined with the iron and titanium compound in a coordination mode to achieve direct doping and stable formation of nano-particles, and finally formed titanium dioxide nano-powder is nitrogen / iron doped anatase phase titanium dioxide, and has the effects of large specific surface area, high visible light absorption efficiency, good photocatalytic degradation effect on organic matters and good stability of an aqueous suspension.

Description

technical field [0001] The application belongs to the technical field of titanium dioxide preparation, and in particular relates to a preparation method of titanium dioxide for air purification. Background technique [0002] Titanium dioxide is one of the most commonly used photocatalysts. Due to its good thermal and chemical stability, it is widely used in the fields of environmental protection, photocatalytic hydrogen production, and self-cleaning materials. However, due to the good photocatalytic performance of anatase TiO 2 The forbidden band width is 3.2eV, and only about 5% of the ultraviolet rays in sunlight can be used, so the utilization rate of solar energy is low. Asahi et al. proposed for the first time that nitrogen doping replaces part of the lattice oxygen in the titanium dioxide lattice, which can reduce the forbidden band width, thereby expanding the photoresponse range of titanium dioxide. [0003] Another important problem to be solved is to reduce the r...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08B01J35/02B01J35/10B01D53/86B01D53/72
CPCB01J27/24B01J37/086B01D53/8687B01J35/23B01J35/60B01J35/40B01J35/39
Inventor 井丽
Owner 西安格帆科技有限公司