Intrinsically safe formaldehyde removal gel and preparation method thereof

Abstract

The invention discloses intrinsically safe formaldehyde removal gel which comprises the following components: Sansevieria trifasciata, aloe, Ficus elastica, Epipremnum aureum, mint, sodium alginate and calcium lactate. The invention also discloses a preparation method of the intrinsically safe formaldehyde removal gel. According to the invention, various plants are used as main bodies; substancessuch as natural flavones, polyphenols, active protease and menthol in plants are extracted and loaded onto the food-grade sodium alginate and calcium lactate copolymerized gel; formaldehyde in the airis adsorbed by using the water retention and porous characteristics of the gel, and the formaldehyde is slowly oxidized through the oxidation effect of the plant active protease so as to become harmless water and carbon dioxide, such that the formaldehyde concentration is reduced. The formaldehyde removal has no safety risk even if children eat the gel by mistake when the gel is placed at home, and the gel is intrinsically safe. The formaldehyde removal gel obtained by the method is biodegradable, can be placed in a plant flowerpot or a field after being used to serve as filler and nutrientsof plants, and is truly environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of air purification, and in particular relates to an intrinsically safe formaldehyde-removing gel and a preparation method thereof. Background technique [0002] With the progress of industrial society, formaldehyde pollution in decoration materials is accompanied by generation. The harm of formaldehyde to human body is potential, slow but serious, and has been listed as a class I carcinogen by the World Health Organization. This is mainly the wood-based panel that is widely used in decoration materials, and the wood-based panel contains a large amount of adhesive resin, accounting for more than 30% of the mass of the wood-based panel. There are three main types of common adhesive resins: urea-formaldehyde resin formed by condensation of urea and formaldehyde; phenolic resin formed by condensation of phenol and formaldehyde; and melamine resin formed by condensation of melamine and formaldehyde. During the ...

AI Technical Summary

Problems solved by technology

Because of its high specific surface area and relatively wide adsorption pore size, activated carbon can absorb a variety of gases with different molecular diameters, and formaldehyde is one of them. Therefore, activated carbon does not have selective adsorption of formaldehyde, and it is passive adsorption. At the same time, the adsorption is saturated Afterwards, affected by external factors such as light or temperature, the adsorbed pollutant gases will be released again, resulting in repeated pollution.

Silica gel is divided into macroporous, mesopore and fine hollow silica gel. Because the molecular diameter of formaldehyde is relatively small, it is suitable to use microporous silica gel. However, silica gel will pollute the environment after use. It is a kind of industrial hazardous waste, so it is not suitable for daily use.

Molecular sieves have a relatively single pore size and have a selective adsorption function, but because of their high price, it is rare to use molecular sieves to adsorb formaldehyde in reality

The second is the chemical absorption method, which uses the chemical reduction properties of formaldehyde to oxidize it into harmless water and carbon dioxide through the oxidation of oxidants. Common oxidants include chlorine dioxide, hydrogen peroxide, potassium permanganate, sodium hypochlorite, etc. Oxidation method The removal of formaldehyde is relatively thorough, and the reaction is irreversible, but these oxidants have strong oxidizing properties, which can not only accelerate the aging and corrosion of metals and other items, but are also poisonous and harmful to the human body. It is very likely that children will accidentally eat them at home and cause harm. Therefore, It is not suitable for use in daily life, and potassium permanganate is also listed as flammable and explosive dangerous goods by the state, ordinary people cannot obtain it, and it is relatively prone to danger

The third is photocatalytic oxidant, which uses light energy to excite the catalyst to generate a certain amount of high-energy hydroxyl radicals, which destroys the molecular structure of formaldehyde through hydroxyl radicals and decomposes into water and carbon dioxide. Generally, common photocatalysts include titanium dioxide and manganese dioxide. , silver ions, etc. The disadvantages of these products are that they are expensive and need to be used in a relatively high ultraviolet environment to be effective. In real life, high-intensity ultraviolet rays cannot be achieved, so their use is greatly limited. Silver ions are also heavy metals. Discarding can easily cause environmental pollution

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