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Citation: Chen Yu-Yin, Liu Fan. Stoichiometric Displacement Model for the Adsorption of Propionic Acid and nButyric Acid by Silica Gel from Aqueous Solution[J]. Acta Physico-Chimica Sinica, ;2002, 18(01): 62-65. doi: 10.3866/PKU.WHXB20020114 shu

Stoichiometric Displacement Model for the Adsorption of Propionic Acid and nButyric Acid by Silica Gel from Aqueous Solution

Chen Yu-Yin ,
Liu Fan

1.
Department of Chemistry, Leshan Teacher′s College, Leshan　614004

Received Date: 11 June 2001
Available Online: 15 January 2002

The adsorption of propionic acid and nbutyric acid from aqueous solution by silica gel has been studied at 293,303 and 313 K respectively.It was found that the adsorption obey stoichoimetric displacement model for adsorption at liquidsolid system (SDMA). The thermodynamics and mechanism of adsorption processes were studied on the basis of linear parameter from SDMA. The adsorption is a spontaneous, exothermic process of reduced entropy. Standard free energy change for the adsorption of nbutyric acid is larger than that of propionic acid. Standard enthalpy change for the adsorption of nbutyric acid is smaller than that of propionic acid. The equation of free energy change for adsorption was derived.
- Silica gel;Adsorption;Propionic acid;n-Butyric acid;　Stoichiometric displacement model for adsorption;Adsorption thermodynamics
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