Adsorption-Desorption of Ammonia and Acetaldehyde by Sepiolite and Active Carbon in Ambient Air.

概要

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The adsorption-desorption of ammonia and acetaldehyde by sepiolite and coconut-shell active carbon in ambient air having various relative humidities (RH) at 25°C and 50°C was studied to develop adsorbents for ammonia and acetaldehyde.<BR>The absolute amount of reversible adsorption for ammonia by sepiolite in ambient air having 25-39% RH at 25°C and 50°C, was the same as that in ambient air having 91% RH at 25°C and was extremely larger than that by the carbon in ambient air having 31-33% RH at 25°C. The amount of ammonia adsorbed by the carbon in ambient air having 25% RH at 50°C was about 3.5 times larger than that in ambient air having 12% RH at 50°C. These facts indicate that sepiolite can be used as an adsorbent for ammonia regardless of RH in ambient air, and that the carbon can be used only at high RH.<BR>The absolute amount of reversible adsorption for acetaldehyde by the carbon was about 3times larger than that by sepiolite in ambient air having 30-90% RH at 25°C and 50°C. In ambient air having 90% RH at 25°C, in paticular, acetaldehyde was purged from the sepiolite which previously adsorbed it, although it was not purged from the carbon which adsorbed it previously. These facts indicate that the carbon can be used as an adsorbent for acetaldehyde regardless of RH in ambient air, and that sepiolite can be used only at relatively low RH.
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