A kind of preparation method of flexible molecular sieve filter membrane for air purification

Abstract

The invention discloses a preparation method of a flexible molecular sieve filtering membrane for air purification. The preparation method comprises the following steps: dissolving a silicon-containing precursor, an aluminum-containing precursor, a template agent and sodium hydroxide in mixed solution of ethyl alcohol and water, carrying out microwave or hydrothermal pressurized reaction, drying, and performing high temperature treatment to obtain a molecular sieve seed crystal; preparing the molecular sieve seed crystal into suspension liquid with ethyl alcohol or propyl alcohol, coating a flexible carrier by the suspension liquid after ultrasonic wave treatment and drying to obtain a seed crystal carrier; and placing the seed crystal carrier into sodium metaaluminate, silica sol and sodium hydroxide solution, carrying out microwave or hydrothermal pressurized reaction, washing, drying, immersing in Cu<2+> solution, and washing and drying to obtain the flexible molecular sieve filtering membrane with catalytic property. A molecular sieve membrane with certain thickness is formed on the flexible carrier by the molecular sieve preparation process through surface coating, and catalyst particles are supported on the flexible molecular sieve filtering membrane to form the flexible molecular sieve filtering membrane with strong adhesion, so that the flexible molecular sieve filtering membrane can remove air particulate matters PM10, PM2.5, formaldehyde and other pollutants, and also can sterilize and produce oxygen.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a method for preparing a flexible molecular sieve filter membrane used for air purification. Background technique [0002] Indoor air purification technology mainly relies on materials such as air filter membranes or air filter membrane nets to physically block gaseous pollutants. There are many kinds of pollutants in the air, which requires the filter membrane to be able to remove a variety of pollutants while ensuring a certain amount of air flux. Therefore, the filter membrane must have the functions of being porous, having high capture efficiency, and removing various pollutants at the same time. Among commercial filter membrane materials, PP, glass fiber and their derivatives are used to make air filter membranes. However, its disadvantages such as complex manufacturing process, high cost, and large air pressure loss make the air purifier equipped with this type of air m...

AI Technical Summary

Problems solved by technology

However, inorganic molecular sieves have problems such as hard texture and high brittleness, which cannot meet the flexibility requirements of air filtration membranes.