Abstract
In this study, three silicalite adsorbents (silicalite a, silicalite b and silicalite c) for ethanol adsorption from aqueous phase were synthesized using tetraethylorthosilicate, Ludax solution and a new organic silica source, Tabasheer, respectively. Tetrapropylammonium hydroxide was used as primary structure directing agent and starch as secondary structure directing agent. XRD, BET, FT-IR and FE-SEM were used to characterize synthesized adsorbents. Single component adsorption for ethanol and water was investigated by non-adsorbing solvent concept. Binary adsorption isotherms of both components were also experimentally measured. A model based on real adsorbed solution theory was developed to predict experimental adsorption data. The XRD characterization confirmed that all silicalite adsorbents have the same MFI-type structure. FE-SEM results revealed that the different silica sources have impact on surface area and morphology. The BET surface area for adsorbents is in order of silicalite c > silicalite a > silicalite b. However, uptake rate toward ethanol is in order of silicalite a > silicalite c > silicalite b. The model based on real adsorbed solution theory predicted experimental adsorption isotherm data very well. In addition, results revealed that the binary adsorption uptake is lower than single component adsorption.
Published Version
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