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Method for revealing mechanism of influence of humidity on polluted gases in TiO2 photocatalytic degradation

A technology of polluting gas and photocatalysis, which is applied in the field of environmental protection and can solve the problems of lack of research on essential scientific principles

Active Publication Date: 2020-01-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many scholars have carried out research on the influence of humidity, the research on the essential scientific principles of its influence is still lacking.

Method used

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  • Method for revealing mechanism of influence of humidity on polluted gases in TiO2 photocatalytic degradation
  • Method for revealing mechanism of influence of humidity on polluted gases in TiO2 photocatalytic degradation
  • Method for revealing mechanism of influence of humidity on polluted gases in TiO2 photocatalytic degradation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This example provides a method based on adsorption simulations and catalytic mechanisms to reveal the effect of humidity on TiO 2 The method for photocatalytic degradation of polluting gas mechanism specifically comprises the following steps:

[0047] Step 1. By studying the effect of humidity on TiO 2 The influence experiment of photocatalytic degradation of HCHO shows that the photocatalytic degradation efficiency of HCHO is affected by the change of humidity;

[0048] Extract gaseous HCHO with an initial concentration of 1.0±0.5ppm from the headspace of the HCHO solution bottle and inject it into the 2 colloidal photocatalytic system in which TiO 2 The solid content of the colloid is 30wt%, and the average particle diameter is 10nm. The ambient humidity range is adjusted to 33-60% by a humidifier, and the ambient temperature is controlled at about 30°C. Under different humidity, turn on the ultraviolet lamp, start the photocatalytic oxidation degradation experime...

Embodiment 2

[0063] This example provides a method based on adsorption simulations and catalytic mechanisms to reveal the effect of humidity on TiO 2 The method for photocatalytic degradation of polluting gas mechanism specifically comprises the following steps:

[0064] Step 1. By studying the effect of humidity on TiO 2 Photocatalytic degradation of C 6 h 6 Influence experiment, get C 6 h 6 The law of photocatalytic degradation efficiency affected by humidity changes;

[0065] The experimental procedure is similar to that in Example 1, except that the gaseous C 6 h 6 from C 6 h 6 Headspace of the solution bottle. according to Figure 2b The results of photocatalytic experiments concluded that in the range of 33-60% ambient humidity, with the increase of humidity, TiO 2 Photocatalytic degradation of C 6 h 6 It is promoted first and then inhibited, and the optimum humidity is 40%.

[0066] Step 2. By simulating C under the action of different numbers of water molecules 6 h ...

Embodiment 3

[0073] This example provides a method based on adsorption simulations and catalytic mechanisms to reveal the effect of humidity on TiO 2 The method for photocatalytic degradation of polluting gas mechanism specifically comprises the following steps:

[0074] Step 1. By studying the effect of humidity on TiO 2 Photocatalytic degradation of H 2 The influence experiment of S, draws H 2 The influence of humidity change on the photocatalytic degradation efficiency of S

[0075] The experimental procedure is similar to that in Example 1, except that gaseous H 2 S derived from H 2 S, N 2 Calibrate the gas distribution system connected to the gas cylinder. according to Figure 2c The results of photocatalytic experiments concluded that in the range of 33-60% ambient humidity, with the increase of humidity, TiO 2 Photocatalytic degradation of H 2 S is promoted.

[0076] Step 2. By simulating H under the action of different numbers of water molecules 2 S on TiO 2 adsorption ...

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Abstract

The invention discloses a method for revealing a mechanism of influence of humidity on polluted gases in TiO2 photocatalytic degradation. A theoretical calculation and analysis method based on a density functional theory adsorption simulation and catalytic reaction mechanism is used to assist a photocatalytic degradation experiment, and study the mechanism of affecting the TiO2 photocatalytic degradation gaseous pollutants by the humidity. The method comprises the following steps of studying an influence experiment of the humidity on TiO2 photocatalytic degradation gaseous pollutants; simulating the adsorption process of the gaseous pollutants on the surface of the TiO2 under the action of different water molecules; and analyzing the photocatalytic reaction mechanism of generating hydroxylradical oxidized gaseous pollutants by H2O molecules. According to the method of the invention, a photocatalysis experiment is combined with simulation calculation and theoretical analysis, in combination with a photocatalytic degradation experiment, the influence mechanism of the humidity on the TiO2 photocatalytic degradation gaseous pollutants is disclosed from multiple perspectives from the perspective of adsorption and catalytic reaction, and a theoretical foundation is laid for the practical application of a photocatalytic oxidation technology.

Description

technical field [0001] The invention relates to the technical field of environmental chemistry, in particular to a method for revealing that humidity affects TiO 2 A method for photocatalytic degradation of polluting gas mechanisms, more specifically related to a method for simulating the effect of water molecules on gaseous pollutants in titanium dioxide (TiO 2 ) The adsorption behavior of the photocatalyst surface, the photocatalytic reaction mechanism and the multi-angle of photocatalytic experiments, to study the effect of environmental humidity on TiO 2 Effect mechanism of photocatalytic degradation of gaseous pollutants. Background technique [0002] Due to the substandard discharge of a large number of gaseous pollutants, the paper industry is facing huge environmental challenges, among which total volatile organic compounds (TVOC), hydrogen sulfide (H 2 S) and formaldehyde (HCHO) etc. exceed the standard seriously. Therefore, how to reduce the emission of gaseous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/10
CPCG01N31/10
Inventor 沈文浩林志峰奚红霞
Owner SOUTH CHINA UNIV OF TECH
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