摘要：

In present work, metal organic frames (MOFs)-molecularly imprinted polymer (MIPs) composite material was synthesized by a surface-imprinting technique based on a chemically modified metalorganic frame as the support matrix. FTIR spectro scopy was utilized to study on chemical groups and SEM was to observe superficial morphology and structure in the MIPs. Adsorption dynamics and selectivity for this MIP toward morpholine molecules were explored and sites distribution on the surface of the MOFs-MIPs composite material was tested. In addition, the capability for this material in solid phase extraction (SPE) of morpholine in fruits crude extract was explored. When this MIP was used as a sobent, adsorption equilibrium could be reached within 150 min, indicating a rapid adsorption dynamics, with an adsorptionc apacity of 183.3mg/g. Scatchard analysis indicated that there were two types of binding sites, with a dissociation constant (K) of 0.579g/Land a maximum apparent adsorption capacity (Qmax) of 326.5mg/g for the high affinity sites and a K value of 2.493 g/Land a Qmaxvalue of 562.9mg/g for the low affinity sites, respectively. Selectivity factors for this MIP toward morpholine relative to methylmorpholine, ethylmorpholine and 4-methylmorpholine-N-oxide were 2.47, 2.48 and 2.24, respectively. Under the optimized conditions, there covery of morpholine obtained by a single step through the MIP solid phase extraction of morpholine in fruits crude extract was 82.44%, showing a high capability in the enrichment of this compound. This material was also shown with a higher reusability.

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