FORMALDEHYDE ELIMINATION USING SEPIOLITE CLAY MINERAL COMBINED WITH AN AMINO ACID

概要

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The adsorption of formaldehyde by sepiolite-amino acid complex (sepiolite combined with an amino acid) was studied in comparison with that of the aldehyde by mere sepiolite. The formaldehyde adsorption isotherms were measured at 25℃ in ambient atmosphere. The adsorptivity of sepiolite-amino acid complex was about 10 times greater than that of mere sepiolite at a low equilibrium concentration (< 1 ppm). However, amino acid itself did not react with formaldehyde. Adsorbents such as sepiolite and activated carbon also have a very small formaldehyde adsorption capacity. We have developed a formaldehyde adsorbent sheet, which is made of a mixture of pulp and sepiolite-amino acid complex. The sheet have put into practical use globally as a scavenger to remove formaldehyde in ambient air.