Abstract
In this study, a kind of homogeneous spherical molecularly imprinted polymers (MIPs) with high specific surface area was prepared, with ginsenoside Re (Re) as template molecule, methacrylic acid (MAA) as functional monomers, ethylglycol dimethacrylate (EGDMA) as crosslinker and poly (vinyl alcohol)-1788 (PVA-1788) as dispersant. The MIPs was characterized by field emission scanning electron microscopy (FESEM) and surface porosity detector, and competitive adsorption behavior of the MIPs was evaluated under different two-component adsorption conditions. The experimental results showed that MIPs had the regular mesopores structure, equilibrium adsorption isotherms of MIPs were in good agreement with Freundlich model under different adsorption conditions (single solute adsorption (SSA), simultaneously competitive adsorption (SCA) and preloaded competitive adsorption (PCA)). The concentration of template (Re) and competitors (Rg1) affect the results of competitive adsorption. Re has obvious priority in competitive adsorption, and this unbalanced competitive adsorption was the results of spatial selectivity and strong inter-molecule forces of MIPs toward Re. The analysis of competitive adsorption of molecularly imprinted materials is helpful to further study the recognition mechanism of molecularly imprinted adsorbent.
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