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Method for preparing silica aerogel photocatalyst formed by compounding nanometer titanium oxide and rare earth solid solution

A technology of nano-titanium oxide and silicon airgel, applied in the field of materials, to achieve strong adsorption capacity, high catalytic performance, and large specific surface area

Active Publication Date: 2014-09-24
天津朗华科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to aim at the technical defects existing in the prior art, and provide a kind of preparation method of the silica airgel photocatalyst that nano-titanium oxide and rare earth solid solution compound, it can make anatase nanoscale titanium oxide and rare earth solid solution Uniformly attached to the pore surface of silica airgel to prepare a photocatalytic material capable of long-term and powerful adsorption and decomposition of gaseous pollutants such as formaldehyde and toluene in the air. The preparation process avoids the problem of agglomeration of nano-scale titanium oxide, and at the same time The sintering temperature is greatly reduced and the cost is reduced

Method used

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  • Method for preparing silica aerogel photocatalyst formed by compounding nanometer titanium oxide and rare earth solid solution
  • Method for preparing silica aerogel photocatalyst formed by compounding nanometer titanium oxide and rare earth solid solution
  • Method for preparing silica aerogel photocatalyst formed by compounding nanometer titanium oxide and rare earth solid solution

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preparation example Construction

[0029] The invention relates to a method for preparing a silica airgel photocatalyst compounded with nano-titanium oxide and a rare earth solid solution, comprising the following steps:

[0030] (1) Pass the silica airgel particles through a 300-mesh sieve, soak them in 20° ammonia water (the content of liquid ammonia is 20%, and the content of pure water is 80%) for 30-36 hours to obtain material A; mix the rare earth nitrate with 1: 1 The weight ratio is dissolved in deionized water, and the material B is obtained after filtration;

[0031] (2) Since titanium sulfate has different calibration methods and standards when purchasing, in order to more accurately add the amount of titanium sulfate, the amount converted from titanium sulfate to titanium oxide is used as the calibration method; the weight converted from titanium sulfate to titanium oxide The ratio is 5%, and the required titanium sulfate is mixed with deionized water with a weight ratio of 95% to form a solution; t...

Embodiment 1

[0049] The rare earth nitrate is selected as cerium nitrate, according to Figure 1-Figure 2 The reaction device described in carries out, and preparation method is as follows:

[0050] (1) Silica airgel particles pass through a 300-mesh sieve, soaked in 20° ammonia water (the content of liquid ammonia is 20%, the content of pure water is 80%) for 30 hours, and it is called material A for use, and the cerium nitrate is 1:1 It is more soluble in deionized water, and it is called material B after filtration;

[0051] (2) Heat the mixed solution of titanium sulfate weight ratio 25kg (20% oxide meter) and deionized water 500kg to 75°C while stirring, keep constant temperature, turn on the ultrasonic vibration while the stirring speed is controlled at 580 rpm, The frequency F of ultrasonic vibration is 35KHz, and the power density P is 0.3W / cm 2 , add 4.3 kg of silica airgel (material A) at a uniform speed within 60 minutes, and react for 30 minutes after the addition;

[0052] ...

Embodiment 2

[0056] The rare earth nitrate is selected as lanthanum nitrate, according to Figure 1-Figure 2 The reaction device described in carries out, and preparation method is as follows:

[0057] (1) Silica airgel particles passed through a 300-mesh sieve, soaked in 20° ammonia water for 36 hours, called material A for later use, dissolved lanthanum nitrate in deionized water at a weight ratio of 1:1, and after filtering, called material B for later use;

[0058] (2) Heat the mixed solution of titanium sulfate weight ratio 28kg (titanium dioxide content in titanium sulfate is 20%) and deionized water 500kg to 78°C while stirring, keep constant temperature, and control the stirring speed at 680 rpm Turn on the ultrasonic vibration, the frequency F of the ultrasonic vibration is 35KHz, and the power density P is 0.3W / cm 2 , add 4.3 kg of silica airgel (material A) at a uniform speed within 68 minutes, and react for 20 minutes after the addition;

[0059] (3) Add an appropriate amount...

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Abstract

The invention discloses a method for preparing silica aerogel photocatalyst formed by compounding nanometer titanium oxide and a rare earth solid solution. The method is particularly characterized in that nanometer titanium oxide / rare earth is attached to the specific surface of silica aerogel, the silica aerogel has the function of adsorbing and catching formaldehyde and other gaseous pollutants in air, and the adsorbed and caught gaseous pollutants can be decomposed through the photocatalysis of anatase titanium oxide loaded on the surface. The advantages of the preliminary screening function of the nanoscale cellular structure of the silica aerogel and the advantages of the catalysis function of nanoscale anatase titanium oxide are integrated, rare earth oxide and nanometer titanium oxide represent a solid solution shape, activity of nanometer titanium oxide is further enhanced, and the long-acting effect and the strong effect of the material catalysis function are achieved.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a method for preparing a silica airgel photocatalyst compounded with nano-titanium oxide and rare earth solid solution. Background technique [0002] Nanomaterials are one of the research hotspots and frontiers in the world today. Due to the small size effect, surface and interface effect, and quantum effect that macroscopic materials do not have, nanomaterials will exhibit completely different properties (optical, electrical, acoustic, thermal, chemical, and mechanical) from conventional materials. effect. Similarly, for porous solid materials, when the porosity reaches a certain value, if the pore size is small enough, the pore size effect and surface effect will also appear, resulting in a series of special properties different from conventional materials. Airgel is a new type of nanoporous material with very broad application prospects. Among them, the porosity of silica...

Claims

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Application Information

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IPC IPC(8): B01J23/10B82Y30/00B82Y40/00B01D53/86B01D53/72
Inventor 崔洁心
Owner 天津朗华科技发展有限公司
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