Guanidine salt modified activated carbon for removing aldehyde, preparation method thereof, composite filter screen comprising guanidine salt modified activated carbon and air purification device

Abstract

The invention provides guanidine salt modified activated carbon for removing aldehyde. The guanidine salt modified activated carbon meets the following indexes: (1) before guanidine salt modification,the initial CTC value of the activated carbon is more than 60; and (2) after guanidine salt modification, the pore volume retention rate of the activated carbon is between 22% and 85%. The inventionalso provides a preparation method of the guanidine salt modified activated carbon, a composite filter screen comprising the guanidine salt modified activated carbon and an air purification device comprising the composite filter screen. By utilizing the guanidine salt modified activated carbon and the composite filter screen comprising the guanidine salt modified activated carbon, aldehyde substances, especially formaldehyde in air, can be efficiently removed (the F-CADR value of the composite filter screen per square meter is 200m < 3 > / h or above).

Description

technical field [0001] The invention relates to the field of air purification, and more particularly relates to guanidinium salt modified activated carbon used for removing aldehydes, a preparation method thereof, a composite filter screen comprising the same and an air purification device. Background technique [0002] Air quality is a hot topic around the world, especially in China. In recent years, more and more families, preferably those with children, like to buy air purifiers. Their focus shifted from PM2.5 to formaldehyde, which is released from paint, flooring and furniture. Formaldehyde is a highly toxic compound and a known sensitizer to humans. In addition, formaldehyde has been classified as a class I carcinogen by the International Agency for Research on Cancer. WHO guides the standard of 30 minutes of exposure to formaldehyde as 0.08ppm. Public awareness of the harmful health effects of continuous exposure to formaldehyde has increased considerably in China...

AI Technical Summary

Problems solved by technology

However, in these existing technologies, technologies or products that only utilize the adsorption properties of activated carbon (without modifiers) or utilize the adsorption properties of modified activated carbons (the modifiers themselves cannot react with formaldehyde) cannot meet the requirements. The current requirements for the removal of formaldehyde; and the technology or product of activated carbon modified by a modifier capable of reacting with formaldehyde has improved the ability to remove formaldehyde, but these literature technologies have not proposed to ensure that the obtained modified activated carbon product can The index parameters for fully removing formaldehyde, and no product index that can meet industrial applications such as modified activated carbon products applied to composite filters for air purification devices

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