A kind of preparation method of high-efficiency formaldehyde adsorption material based on activated carbon

Abstract

The invention discloses a method for preparing a high-efficiency formaldehyde adsorption material based on activated carbon. The specific preparation process is as follows: add oxidized activated carbon to epichlorohydrin, add triethylamine to it at the same time, heat up and reflux to obtain chlorinated grafted activated carbon ; The pretreated paper fiber is reacted with chlorinated grafted activated carbon to obtain a cellulose-loaded modified activated carbon material; the cellulose-loaded modified activated carbon material is subjected to amination reaction to obtain an adsorption material. In the present invention, the activated carbon is oxidized and then grafted and modified to graft on the cellulose. The cellulose contains abundant hydroxyl groups and can introduce a large amount of amino groups through amination. At the same time, the hydroxyl groups produced in the grafting process can also undergo amination reaction, and a large number of amino groups are introduced, so that the prepared adsorbent not only contains a large number of amino groups, but also has a large specific surface area, which improves the adsorption performance of the adsorbent on formaldehyde.

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...

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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

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