Effect of relative humidity on the adsorption of acetaldehyde by sepiolite and sepiolite-2-aminobenzoic acid complex

The adsorption of acetaldehyde by sepiolite combined with 2-aminobenzoic acid (sepiolite-OABA complex) was studied in comparison with that of the aldehyde by mere sepiolite. Experiments were carried out at 25°C in ambient air having relative humidity of 9.0, 30, 60, and 80%. Combination of 2-aminobenzoic acid (OABA) with sepiolite was found to give big enhancement on the adsorptive capacity of sepiolite. For example, in 9.0% relative humidity, the adsorptive capacity of sepiolite combined with 10% OABA was about 10 times larger than that of mere sepiolite. In 30, 60, and 80% relative humidity, that of sepiolite combined with 10% OABA was about 30, 50, and over 100 times larger than that of mere sepiolite, respectively