Preparation method of efficient formaldehyde adsorption material based on activated carbon

Abstract

The invention discloses a preparation method of an efficient formaldehyde adsorption material based on activated carbon. The preparation method specifically comprises the following steps: adding oxidized activated carbon into epoxy chloropropane, meanwhile, adding triethylamine into the epoxy chloropropane, and carrying out a heating reflux reaction to obtain chlorinated grafted activated carbon;carrying out a reaction on pretreated paper fibers with the chlorinated grafted activated carbon to obtain a cellulose loaded modified activated carbon material; and carrying out an amination reactionon the cellulose loaded modified activated carbon material to obtain the adsorption material. According to the invention, the activated carbon is subjected to oxidation treatment and then is graftedon cellulose after grafting modification, and the cellulose is rich in hydroxyl, so that a large amount of amino groups can be introduced through amination; meanwhile, the surface of the activated carbon subjected to oxidative grafting treatment has an increased specific surface area, and hydroxyl groups generated in a grafting process can also be used for the amination reaction, so that the largeamount of amino groups are introduced, then the prepared adsorbent not only contains a large amount of amino groups, but also has a large specific surface area, and thus adsorption performance of theadsorbent to formaldehyde is improved.

Description

technical field [0001] The invention belongs to the field of preparation of formaldehyde adsorption materials, and relates to a preparation method of a high-efficiency formaldehyde adsorption material based on activated carbon. Background technique [0002] The decoration materials for interior decoration usually contain a certain amount of formaldehyde. In a closed indoor environment, formaldehyde is easily inhaled by the human body, which in turn causes harm to the human body. [0003] After the existing interior decoration, formaldehyde is usually removed by ventilation and putting activated carbon in it. Activated carbon has more pore structure and larger specific surface area, which can realize a large amount of formaldehyde adsorption, but the physical adsorption content of activated carbon to formaldehyde In the prior art, the content of acidic groups in formaldehyde is usually increased by oxidation, thereby improving the adsorption performance of formaldehyde, but t...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of the high-efficiency formaldehyde adsorption material based on activated carbon, improve the content of carboxyl group and phenolic hydroxyl group on the surface of activated carbon after the activated carbon is oxidized, and introduce into it through the effect of carboxyl group, phenolic hydroxyl group and epichlorohydrin The R-Cl group can be grafted on the pretreated paper fiber through a substitution reaction, and the epichlorohydrin ring-opens to generate an alcoholic hydroxyl group. Since there is a large gap between the paper fibers, activated carbon is grafted by composite, so that the activated carbon Filled in the gap, because activated carbon has more voids and has a larger specific surface area, it can absorb a large amount of formaldehyde through physical adsorption. After the activated carbon is grafted on the fiber chain, it is filled in the paper fiber gap, increasing The specific surface area and adsorption performance of the fiber are improved, and the paper fiber matrix contains a large amount of secondary alcohol, and the surface of the activated carbon contains the hydroxyl group generated after the ring opening of epichlorohydrin, which can be cross-linked with the primary alcohol group of the graft modifier. , so that the graft modifier is introduced into the adsorbent, so that a large amount of amino groups are introduced into the cellulose chain of the adsorbent and the surface of the activated carbon, which further improves the adsorption performance of the adsorbent to formaldehyde. When the formaldehyde concentration is 2mg / m 3 In the environment, the scavenging rate of formaldehyde reaches 100%, which can effectively realize the removal of formaldehyde, and solve the problem that in the existing prior art, the content of acidic groups in formaldehyde is usually increased by oxidation, thereby improving the adsorption performance of formaldehyde Yes, but the adsorption capacity cannot meet the requirements

Images