Synthesis and Adsorption Property of Calixarene-p-sulfonate-intercalated Layered Double Hydroxides

The synthesis of the p-sulfonate[4]calixarene (CS4)/M2+–Al layered double hydroxides (Mg–Al and Zn–Al/CS4/LDHs) has been investigated as well as their adsorption behavior of benzyl alcohol (BA) in aqueous solution. The CS4/LDHs were easily synthesized by the conventional coprecipitation method. The basal spacing of the CS4/LDHs was expanded to 1.33 (Mg–Al) and 1.61 nm (Zn–Al), which indicates that CS4 cavity axis was oriented vertically (Mg–Al) and parallel (Zn–Al) to the LDH basal layer, respectively. In particular, the Zn–Al/CS4/LDH was found to have 2 types of micro pore, the CS4 cavity and the intermolecular space. The adsorption of BA to the CS4/LDH was influenced by the amount and orientation of CS4 ion in the interlayer of the LDHs.