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Abstract: Hydroxybenzoic acid compounds are used widely and have strong polarity. The separation, purification and analysis of their analogues in complex aqueous solution are very difficult. In this paper, magnetic surface molecularly imprinted polymer (MIP) was prepared using nano magnetic Fe3O4 as the carrier and gallic acid (GA) as the template molecule, and characterized by transmission electron microscopy, infrared spectroscopy and magnetic intensity measurement. Then its adsorption properties and adsorptive selectivity were studied by the static adsorption and dynamic adsorption experiments to compare the adsorption properties of GA on MIP with those of 2,4-dihydroxybenzoic acid, salicylic acid and benzoic acid. The results show that the MIP with GA as the template has a core-shell structure with a strong bonding effect, the adsorption process belongs to Langmuir monolayer adsorption and the adsorption kinetics can satisfy the pseudo-second-order kinetic equation model. The MIP exhibits an excellent selectivity for GA, and its adsorption capacity (37.736 mg/g at 318 K) is much higher than those of other structural analogues. The MIP prepared by this method can not only recognize the template molecule, but also be magnetically controlled. The high separation efficiency is applicable to the solid phase extraction.
Template and target information: gallic acid, GA
Author keywords: surface molecular imprinting, selective recognition, hydroxybenzoic acid, adsorption, magnetic Fe3O4