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Cerium-doped nano titanium dioxide/activated carbon fiber composite photocatalyst for air purification and preparation method thereof

A technology of nano-titanium dioxide and activated carbon fiber, which is applied in the field of photocatalytic materials, can solve the problems of low photocatalytic decomposition rate of low-concentration volatile organic pollutants, and achieve the effects of improving photocatalytic activity, prolonging life, and high degradation efficiency

Active Publication Date: 2014-01-15
ZHEJIANG GLOBALVILLAGE TECH INNOVATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activated carbon fiber described in this invention not only maintains the porosity of the activated carbon fiber, but also enhances the photocatalytic activity of titanium dioxide particles, and can be used for the removal of low-concentration volatile organic pollutants, but the photocatalytic decomposition of low-concentration volatile organic pollutants The rate is low, around 36%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Weigh 1.00g of nano titanium dioxide P25 powder, 0.10g of Na 2 SiO 3 and 0.03g of cerium nitrate (their mass ratio is 100:10:3), set aside;

[0021] 2) The weighed nano titanium dioxide P25 powder and Na 2 SiO 3 Place in a container, add 100mL of distilled water (the concentration of nano-titanium dioxide P25 is 10g / L), stir magnetically for 30min, then add weighed cerium nitrate, and stir magnetically for 2h to obtain nano-titanium dioxide suspension doped with cerium nitrate;

[0022] 3) Take 0.050g of activated carbon fiber and place it in the nano-titanium dioxide suspension doped with cerium nitrate, soak it under ultrasonic conditions for 30min, take it out, dry it at room temperature and then keep it at 200°C for 3h, take it out, cool it, The cerium-doped nano-titanium dioxide / activated carbon fiber composite photocatalyst used for air purification according to the present invention is obtained.

[0023] The cerium-doped nano-titanium dioxide / activated car...

Embodiment 2

[0025] 1) Weigh 1.80g of nano titanium dioxide powder (anatase type), 0.20g of Na 2 SiO 3 and 0.09g of cerium nitrate (their mass ratio is 100:11.1:5), spare;

[0026] 2) The weighed nano titanium dioxide powder and Na 2 SiO 3 Place in a container, add 100mL of distilled water (the concentration of nano-titanium dioxide is 18g / L), stir magnetically for 20min, then add weighed cerium nitrate, and stir magnetically for 1.5h to obtain nano-titanium dioxide suspension doped with cerium nitrate;

[0027] 3) Take 0.050g of activated carbon fiber and place it in the nano-titanium dioxide suspension doped with cerium nitrate, soak it under ultrasonic conditions for 40min, take it out, dry it at room temperature and then keep it at 220°C for 4h, take it out, cool it, The cerium-doped nano-titanium dioxide / activated carbon fiber composite photocatalyst used for air purification according to the present invention is obtained.

[0028] The cerium-doped nano-titanium dioxide / activated ...

Embodiment 3

[0030] 1) Weigh 2.40g of nano titanium dioxide P25 powder, 0.20g of Na 2 SiO 3 and 0.24g of cerium nitrate (their mass ratio is 100:8.3:10), set aside;

[0031] 2) The weighed nano titanium dioxide P25 powder and Na 2 SiO 3 Place in a container, add 100mL of distilled water (the concentration of nano-titanium dioxide P25 is 24g / L), stir magnetically for 50min, then add weighed cerium nitrate, and stir magnetically for 3h to obtain nano-titanium dioxide suspension doped with cerium nitrate;

[0032] 3) Take 0.060g of activated carbon fiber and place it in the above-mentioned nano-titanium dioxide suspension doped with cerium nitrate, soak it under ultrasonic conditions for 60min, take it out, dry it at room temperature and then keep it at 210°C for 2h, take it out, cool it, The cerium-doped nano-titanium dioxide / activated carbon fiber composite photocatalyst used for air purification according to the present invention is obtained.

[0033] The cerium-doped nano-titanium dio...

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Abstract

The invention discloses a cerium-doped nano titanium dioxide / activated carbon fiber composite photocatalyst for air purification and a preparation method thereof. The preparation method comprises the following steps: doping cerium nitrate into nano titanium dioxide to obtain the cerium-doped nano titanium dioxide suspension, putting proper amount of activated carbon fiber into the suspension, soaking for 20-60 minutes under ultrasonic conditions, taking out, airing, and keeping the temperature at 200-220 DEG C for 2-4 hours, thereby obtaining the cerium-doped nano titanium dioxide / activated carbon fiber composite photocatalyst for air purification. Compared with the prior art, the rare-earth cerium is doped into the nano titanium dioxide, thereby prolonging the service life of photovoltaic electron-hole pairs, enhancing the quantum effect of the nano titanium dioxide, and further enhancing the photocatalytic activity of the nano titanium dioxide; and the whole method is simple and easy to control; and the product prepared by the method has high degradation efficiency for volatile organic pollutants, especially formaldehyde gas, reaching more than 90%.

Description

technical field [0001] The invention relates to a photocatalytic material, in particular to a cerium-doped nano-titanium dioxide / activated carbon fiber composite photocatalyst for air purification and a preparation method thereof. Background technique [0002] Indoor volatile organic compounds (VOC s ) concentration is not high, but when the human body is in this environment for a long time, it will endanger human health. At present, there are two commonly used methods for purifying volatile organic compounds: one is the adsorption method, which uses porous substances with adsorption capacity to transfer pollutants from the gas phase to the adsorbent, but this method cannot degrade the pollutants, and After the adsorbent is saturated, it must be regenerated before it can continue to be used; the other is the photocatalytic purification method, which uses the oxidative decomposition ability of the holes generated by the photocatalyst under ultraviolet irradiation, and can ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J21/18B01J35/06B01D53/86B01D53/72
Inventor 莫德清
Owner ZHEJIANG GLOBALVILLAGE TECH INNOVATION CO LTD
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