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Method for treating exhaust gases by utilizing wet polyphase visible light catalytic oxidation

A photocatalytic oxidation and catalytic oxidation technology, applied in the environmental field, can solve the problems of low recycling rate and reduced photocatalyst activity, and achieve the effects of increased catalytic efficiency, enhanced stability, high-efficiency photocatalytic activity and removal effect

Inactive Publication Date: 2012-06-27
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a method for treating waste gas using wet heterogeneous photocatalytic oxidation technology, which can treat various gas pollutants at the same time, avoiding secondary pollution; After the reaction, the intermediate products and final products accumulate on the surface of the catalyst, which leads to the disadvantages of reduced photocatalyst activity and low recycling rate.

Method used

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  • Method for treating exhaust gases by utilizing wet polyphase visible light catalytic oxidation
  • Method for treating exhaust gases by utilizing wet polyphase visible light catalytic oxidation
  • Method for treating exhaust gases by utilizing wet polyphase visible light catalytic oxidation

Examples

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Effect test

Embodiment 1

[0019] Embodiment 1: the preparation of supported BiOI photocatalyst

[0020] Weigh 0.8311 g of KI into a conical flask, add 40 ml of ethylene glycol, and sonicate until completely dissolved. Weigh 2.425 g Bi(NO 3 ) 3 10H 2 O was dissolved in the above solution and continued to sonicate until completely dissolved. Weigh 40 g active Al 2 o 3 Or molecular sieve particles, add to the above solution, shake in a constant temperature shaking box for 30 min. The synthetic reaction chemical equation of BiOI is:

[0021] Bi(NO 3 ) 3 + KI+H 2 O = BiOI + KNO 3 + 2HNO 3 (I)

[0022] The above-mentioned substances were transferred to a high-pressure reactor with a polytetrafluoroethylene liner so that the filling volume of the reactor was 80%, and after reacting in a vacuum oven at 160 °C for 12 hours, it was taken out and naturally cooled to room temperature. Then filter and wash several times with ethanol solution until the filtrate becomes clear. The activated alumina ...

Embodiment 2

[0024] Example 2: Supported BiOI photocatalyst wet oxidation treatment of nitrogen oxides NO

[0025] The wet heterogeneous visible light catalytic reaction device uses a reactor made of hard glass as the core device of the system. The prepared supported BiOI catalyst microspheres are filled in it, and a visible light tube is fixed on the outer wall of the reactor and a 150 W The iodine-gallium lamp light source is a visible light source to provide visible light of λ≥ 420 nm. The whole device is wrapped in tin foil, and is equipped with a peristaltic pump to provide a liquid-phase aqueous solution at a certain flow rate.

[0026] Weigh 40 g Wt. 2.53% of the BiOI catalyst loaded on activated alumina and fill it in the photocatalytic reactor. Under the condition of air flow rate of 0.1 L / min, 50 ppm of NO gas, while providing an aqueous solution with a flow rate of 10 mL / min through a peristaltic pump and spraying the aqueous solution from the upper nozzle of the reactor. When t...

Embodiment 3

[0045] Example 3: Supported BiOI photocatalyst wet oxidation treatment of sulfur dioxide SO 2

[0046] The wet-type heterogeneous visible-light catalytic reaction device adopts the heterogeneous wet-type visible-light catalytic reactor described in Example 2, and uses a 150 W iodine-gallium lamp as the visible light source to provide visible light of λ≥420 nm. Weigh 40 g Wt. 2.53% of the BiOI catalyst loaded on activated alumina and fill it in the photocatalytic reactor, and pass 50 ppm from the sand core aeration head at the bottom of the reactor under the condition of air flow rate of 0.1 L / min SO 2 At the same time, a peristaltic pump is used to provide an aqueous solution with a flow rate of 10 mL / min and the aqueous solution is sprayed from the upper nozzle of the reactor. When the gas / liquid / solid three-phase reaches adsorption equilibrium, the visible light source is turned on. SO 2 can be completely removed by wet heterogeneous photocatalytic oxidation (see figure...

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Abstract

The invention discloses a method for treating exhaust gases by utilizing wet polyphase visible light catalytic oxidation. The method comprises the following steps: arranging a spray device on a visible light photocatalytic reactor with a supported BiOI catalyst, inletting a pollutive gasto the photocatalytic reactor with the supported BiOI catalyst from the bottom, and simultaneously starting the spray device to spray a liquid phase aqueous solution. The method can be used to remove and treat volatile organic gases and gas pollutants containing sulfur, oxynitrides, hydrogen sulfide, methyl mercaptan and the like, and the generation of secondary pollutants can be simultaneously prevented by adopting the method to treat the exhaust gases. The method has the advantages of simple process flow, simple preparation and repeatable utilization of the catalyst, low cost and simple operation.

Description

[0001] technical field [0002] The invention relates to the field of environment, in particular to a method for treating waste gas by using wet heterogeneous visible light catalytic treatment technology. Background technique [0003] Air pollution causes the destruction of the ozone layer, acid rain and the "greenhouse effect", which endangers human health, affects plant growth, and has a serious impact on people's lives. Air pollution has become an important problem faced by urban residents all over the world. Gas pollutants mainly include volatile organic compounds, as well as a large number of acid pollutants such as sulfur dioxide and nitrogen oxides emitted during the combustion of fossil fuels. Air pollution has caused serious pollution to the environment, making it a worldwide environmental pollution problem. Therefore, it is urgent to control the emission of gas pollutants. Traditional separate desulfurization and denitrification technologies have very high investm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/14B01D53/02B01D53/50B01D53/56B01D53/52B01J27/06
Inventor 何春黄艳玲夏德华朱林飞徐作成杨婧羚张琼苏敏华
Owner SUN YAT SEN UNIV
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