ケイ藻土材料へのアセトアルデヒド吸着挙動に対する湿度の影響

概要

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The effect of humidity on the adsorption behavior of acetaldehyde was examined on a diatomaceous material (DM) both in a flow and a closed systems. All the adsorption isotherms of acetaldehyde with the flow system at 298, 313 and 323 K obeyed the Langmuir equation for 10% relative humidity (RH) in all the regions of partial pressure of acetaldehyde (P_<CH_3CHO>). In 60% RH, the adsorption isotherms obeyed the Langmuir equation up to 0.07 atm of P_<CH_3CHO>. Heat of adsorption in 60% RH in the range of P_<CH_3CHO> was larger than that in 10% RH, indicating strong interaction of adsorbed acetaldehyde and water. At P_<CH_3CHO> higher than 0.07 atm in 60% RH, the adsorption isotherms deviated from the Langmuir equation and the adsorbed amounts linearly increased with increasing PCH.CHO. The linearity suggested that acetaldehyde dissolved into multilayer of water on the surface of DM predominantly, in the range of P_<CH_3CHO>. Adsorption behavior obtained in a closed system suggested that both the initial adsorption rate and the adsorption rate constant in 60% RH were twice those in 10% RH.
社団法人日本セラミックス協会の論文
2003-06-01