Mesoporous photocatalytic material and preparation method thereof

A technology of photocatalytic materials and mesoporous materials, applied in the field of photocatalytic composite materials, can solve the problems of difficult recovery and easy deactivation, and achieve the effects of uniform distribution, good stability and good repeatability

Inactive Publication Date: 2015-12-30
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalytic activity of photocatalytic materials depends largely on the specific surface area of ​​the material, nano-TiO 2 Although it has a large specific surface area, the disadvantages of easy deactivation and difficult recovery greatly limit its application, so the TiO 2 Loading to increase the specific surface area of ​​the material is an effective way to solve this problem

Method used

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  • Mesoporous photocatalytic material and preparation method thereof
  • Mesoporous photocatalytic material and preparation method thereof
  • Mesoporous photocatalytic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Dissolve 1.7g of template agent P123 and 3g of NaCl in 100ml of 1mol / L hydrochloric acid solution to form an acid solution, and stir at room temperature until clear.

[0035] (2) Add 4g of ethyl orthosilicate and stir at 35°C for 24h.

[0036] (3) Add 1.63g of isopropyl titanate and continue to stir for 7h, then let the product stand at 100°C for 24h to allow it to precipitate.

[0037] (4) Suction filter the product after standing, wash with deionized water and ethanol to remove excess P123, and calcinate at 550°C for 5h to obtain TiO 2 -SiO 2 Mesoporous material powder. combine figure 1 Medium TiO 2 -SiO 2 The transmission electron microscope image of the mesoporous material shows that the material template has an ordered tubular mesoporous structure with an aperture of about 8nm; figure 2 Medium TiO 2 -SiO 2 The X-ray diffraction (XRD) pattern of the mesoporous material clearly shows that the TiO 2 Diffraction peaks of anatase. It can be seen that the me...

Embodiment 2

[0041] (1) Dissolve 1.7g of template agent P123 and 2.55g of NaCl in 80ml of 1mol / L hydrochloric acid solution to form an acid solution, and stir at room temperature until clear.

[0042] (2) Add 3.5g ethyl orthosilicate and stir at 30°C for 23h.

[0043] (3) Add 1.43 g of isopropyl titanate and continue to stir for 6 h, then let the product stand at 90° C. for 22 h to allow it to precipitate.

[0044] (4) Suction filter the product after standing, wash with deionized water and ethanol to remove excess P123, and calcinate at 500°C for 4h to obtain TiO 2 -SiO 2 Mesoporous material powder.

[0045] (5) Take 0.6gTiO 2 -SiO 2 The mesoporous material powder is dissolved in a mixed solution containing 1.2mL1mmol / L silver nitrate solution, 6ml deionized water and 7.2ml methanol, and the temperature is controlled at 30°C, the wavelength is 320~400nm, and the power is 0.6mW / cm 2 Stir for 5 min under UV light irradiation.

[0046] (6) The product was suction filtered, washed with ...

Embodiment 3

[0048] (1) Dissolve 1.7g of template agent P123 and 3.4g of NaCl in 120ml of 1mol / L hydrochloric acid solution to form an acid solution, and stir at room temperature until clear.

[0049] (2) Add 4.25g ethyl orthosilicate and stir at 40°C for 22h.

[0050] (3) Add 1.73g of isopropyl titanate and continue to stir for 8h, then let the product stand at 110°C for 20h to allow it to precipitate.

[0051] (4) Suction filter the product after standing, wash with deionized water and ethanol to remove excess P123, and calcinate at 600°C for 6h to obtain TiO 2 -SiO 2 Mesoporous material powder.

[0052] (5) Take 0.6gTiO 2 -SiO 2 Dissolve the mesoporous material powder into a mixed solution containing 2.4mL1mmol / L silver nitrate solution, 12ml deionized water and 14.4ml methanol, and control the temperature at 27°C, at a wavelength of 320~400nm, and a power of 0.85mW / cm 2 Stir for 2 min under UV light.

[0053] (6) The product was suction filtered, washed with deionized water and d...

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Abstract

The invention discloses a silver nanoparticle modification TiO2-SiO2 mesoporous photocatalytic material and a synthetic method thereof. A sol-gel method is adopted to synthesize the TiO2-SiO2 mesoporous material. A tubular center hole of the TiO2-SiO2 mesoporous photocatalytic material is modified by silver nanoparticles through a photodeposition method. The preparation method comprises the steps that a nonionic surfactant P123 is used as a template agent at first, and tetraethoxysilane and titanium isopropoxide are added for preparation of the TiO2-SiO2 mesoporous material; then silver nitrate is added, photodeposition is carried out under ultraviolet irradiation, and therefore the silver nanoparticle modification TiO2-SiO2 mesoporous photocatalytic material is obtained. The preparation method is easy to implement and low in cost, TiO2 and SiO2 can be effectively combined, the silver nanoparticles are stably distributed in the tubular center hole in the mesoporous material, and the photocatalytic activity of the material is significantly improved.

Description

technical field [0001] The invention relates to a silver nanoparticle modified TiO 2 -SiO 2 A mesoporous photocatalytic material and a preparation method thereof belong to the technical field of photocatalytic composite materials. Background technique [0002] Since TiO 2 Since the photocatalytic performance was discovered, TiO 2 Photocatalytic technology has been extensively studied. The catalytic activity of photocatalytic materials depends largely on the specific surface area of ​​the material, nano-TiO 2 Although it has a large specific surface area, the disadvantages of easy deactivation and difficult recovery greatly limit its application, so the TiO 2 Loading to increase the specific surface area of ​​materials is an effective way to solve this problem. [0003] SiO with porous structures such as micropores and mesopores 2 Due to its high specific surface area, good physical and chemical stability, the material has a wide range of applications as adsorbents in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66B01J27/24
Inventor 李轶倪凌峰郭燕飞都基铭
Owner HOHAI UNIV
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