Fresh air purifying photocatalysis technology for fresh air system

Abstract

The invention relates to a photocatalyst for removing volatile organic compounds (VOCs) contained in fresh air which is inhaled into indoor by a fresh air system. A hydrothermal synthesis method is used for preparing a TiO2 material with a mesoporous structure and a high photocatalytic activity, and a photocatalyst prepared by the method has the mesoporous structure and high photocatalysis efficiency for removing formaldehyde. The invention is characterized in that a preparation method comprises the following steps: a certain amount of titanium alkoxide is dissolved into absolute ethyl alcohol, and a solution A is prepared; a template whose mass percentage is 15-35% and a chelating agent whose mass percentage is 10-25% (the mass percentages are calculated based on the titanium alkoxide raw material) are dissolved into deionized water, and a solution B is prepared; the solution A and the solution B are mixed in order to prepare suspension liquid; the suspension liquid is transferred to a crystallization reaction vessel whose inner liner is made from polytetrafluoroethylene, a reaction is carried out at 150-220 DEG C for 6-24 hours, the reaction vessel is cooled to a room temperature, centrifugation is carried out for reaction products in order to obtain precipitation, deionized water and absolute ethyl alcohol are used for cleaning for 5-10 times, pumping filtration is carried out in order to obtain a sample, and the sample is dried in a baking oven at 100-120 DEG C for 12-24 hours in order to obtain powder; the powder is placed in a muffle furnace, the muffle furnace is heated at a speed of 1-5 DEG C / min to 450-650 DEG C, calcination is carried out for 3-5 hours, and the TiO2 photocatalyst with the mesoporous structure is obtained.

Description

technical field [0001] The invention belongs to the field of fresh air equipment, and in particular relates to a photocatalytic technology for purifying fresh air in a clean fresh air system. Background technique [0002] At present, a large number of civil buildings in China mostly rely on natural ventilation to achieve indoor ventilation. However, in recent years, due to factors such as motor vehicle exhaust emissions, industrial exhaust emissions, and engineering construction, the air quality outside urban buildings has caused high concentrations of pollution, especially in hazy days. The role of natural ventilation is no longer to dilute indoor air pollution, but to worsen indoor air quality. Some buildings use a fresh air system. Although the fresh air system has a good function of sterilizing and filtering particulate matter, it cannot remove the volatile organic compounds (VOCs) contained in the inhaled outdoor air, and cannot achieve a satisfactory air purification ...

AI Technical Summary

Problems solved by technology

However, in recent years, due to factors such as motor vehicle exhaust emissions, industrial exhaust emissions, and engineering construction, the air quality outside urban buildings has caused high concentrations of pollution, especially in hazy days. The role of natural ventilation is no longer to dilute indoor air pollution, but to worsen indoor air quality

Some buildings use a fresh air system. Although the fresh air system has a good function of sterilizing and filtering particulate matter, it cannot remove the volatile organic compounds (VOCs) contained in the inhaled outdoor air, and cannot achieve a satisfactory air purification effect.