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Preparation method of photocatalyst

A photocatalyst and solvent technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low efficiency of titanium dioxide filter exhaust gas treatment, achieve excellent photocatalytic activity, and the method is simple and easy OK, strong oxidation-reduction effect

Pending Publication Date: 2019-09-20
SHENZHEN THY ENVIRONMENTAL PROTECTION INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of photocatalyst, solve the problem of low efficiency of waste gas treatment of titanium dioxide filter screen in the prior art, etc.

Method used

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preparation example Construction

[0019] The present invention relates to a kind of preparation method of photocatalyst, comprising:

[0020] A. Suspend titanium dioxide in a solvent and stir continuously for at least 60 minutes to form a suspension; wherein, the average particle size of titanium dioxide is 5nm-1000nm; preferably, the average particle size of titanium dioxide is 10nm-50nm, and titanium dioxide is preferably p25 titanium dioxide , p25 titanium dioxide is a nano-scale white powder, the hydroxyl groups on the surface make it hydrophilic, and it is a mixture of anatase and rutile with an average particle size of 25nm; wherein, the solvent includes but is not limited to water, Ethanol, methanol, acetone, etc., preferably use water as the solvent; the mass of titanium dioxide suspension added to each 1L solvent is 0.5g~5g / L, that is, 0.5g~5g titanium dioxide is added to each 1L solvent to suspend in the solvent; Preferably, the mass of titanium dioxide suspended in every 1L of solvent is 1.5g-3.5g, ...

Embodiment 1

[0024] Take 0.1 g of titanium dioxide p25, dissolve it in 200 g of water, stir for 60 minutes to form a suspension, then pour 10 g of coconut shell activated carbon into the suspension, stir for 3 hours, and after standing for 1 hour, pour off the aqueous solution and soak Activated carbon of titanium dioxide p25 is placed in an oven, baked at 70°C for 3 hours, then heated up to 170°C, and baked for 2 hours to obtain the required photocatalyst. Using the photocatalyst of this embodiment to catalyze the photolysis of toluene organic waste gas under the irradiation of ultraviolet lamps, the removal effect reaches about 92%.

Embodiment 2

[0026] Take 0.5 grams of titanium dioxide p25, dissolve it in 300 grams of water, stir for 60 minutes to form a suspension, then pour 10 grams of coconut shell activated carbon into the suspension, stir for 3 hours, let it stand for 1 hour, pour off the aqueous solution, and impregnate The activated carbon of titanium dioxide p25 is placed in an oven, baked at 100 degrees for 2 hours, then heated up to 220 degrees, and baked for 1 hour to obtain the required photocatalyst. Using the photocatalyst of this embodiment to catalyze the photolysis of toluene organic waste gas under the irradiation of ultraviolet lamps, the removal effect can reach about 95%.

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Abstract

The invention relates to a preparation method of a photocatalyst. The preparation method comprises the following steps: A, suspending titanium dioxide in a solvent to form a suspension; B, adding coconut shell activated carbon to the suspension for supporting the titanium dioxide on the coconut shell activated carbon through continuous stirring; and C, removing the solvent and drying the product to obtain the photocatalyst. Coconut shell activated carbon is used as a carrier, and nano titanium dioxide is loaded on the carrier to prepare the photocatalyst. The method is simple and easy to implement, titanium dioxide nanoparticles are uniformly dispersed on the surface and in a pore channel structure of the coconut shell activated carbon by utilizing the characteristic of large specific surface area of the coconut shell activated carbon, and a material with excellent photocatalytic activity can be prepared by using a small amount of titanium dioxide; the material is stable in chemical property, high in oxidation-reduction property, low in cost and long in service life, the removal effect can reach 90% or above when toluene organic waste gas is subjected to catalytic photolysis, and the photolysis efficiency is very high.

Description

technical field [0001] The invention relates to the technical field of waste gas photolysis, in particular to a preparation method of a photocatalyst. Background technique [0002] Existing photocatalytic equipment is composed of UV lamp tubes and stainless steel cabinets, which use ultraviolet light to photolyze organic waste gas to generate H 2 O and CO 2 and other harmless substances. At present, in order to improve the photolysis efficiency of organic waste gas, titanium dioxide filters are used as photocatalysts, but ultraviolet light cannot be fully utilized, and the photolysis efficiency is low. For example, the specific surface area of ​​the filter is small, and the photocatalytic quantum efficiency is low. For some The treatment efficiency of special refractory waste gas (such as toluene, etc.) is extremely low, which makes the photocatalytic technology unable to be applied on a large scale in industry. Contents of the invention [0003] The purpose of the pres...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J21/18B01J35/10B01J37/02B01D53/86B01D53/44
CPCB01J21/063B01J21/18B01J37/0201B01D53/8687B01J35/61B01J35/39
Inventor 喻小龙谢锄张吉辉刘荣芬鲍金锋
Owner SHENZHEN THY ENVIRONMENTAL PROTECTION INC
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