Adsorptive removal of phthalate esters from wastewater combined with their persulfate (PS) catalytic degradation has attracted the attention of many researchers. In this study, the adsorptive and catalytic properties of an MIL100 material obtained by a green synthetic route have been optimized by a surface molecular imprinting technique. Results have shown that there are two steps in the molecular imprinting process. A polymerization is first carried out in the internal channels of the material and the imprinting layer is then formed on the surface. The relative proportions of the starting materials for the synthesis have been optimized through the design of a three-dimensional response surface. The amount of pollutant adsorbed was increased fourfold after surface imprinting, reaching 13.6 mg g −1 . The homogeneity of the recognition sites has been evaluated by dynamics calculations and the Freundlich equation. The selective adsorption ability of the material for diethyl phthalate was improved, and the process involved chemical adsorption. The catalytic properties of the material after imprinting were increased about 1.5-fold, indicating that selective adsorption is important. Such molecularly imprinted polymers may potentially serve as good functional materials for the removal of phthalate esters from wastewater.
In this study, MIL100(Fe-base metal organic framework) molecularly imprinted catalyst(MIL100-MIP) was synthesized using the surface imprinting method. Results determining the pore structures as well as the kinetic and thermodynamic properties of MIL100-MIP showed that the recognition process of imprinted materials containing DEP occurred on the outer surface. By regulating the thickness of the imprinted layer to optimize persulfate(PS) transfer, the transfer efficiency of PS and the rate constant(K) of MIL100-MIP were four times higher than that of MIL100. With the synergy of adsorption and catalysis, the removal of DEP from MIL100-MIP reached 105.2 mg g −1 . The precise adsorption of DEP was mainly realized by hydrogen bonding, electrostatic forces and hydrophobic interactions of π-π stacking. The enhanced DEP concentration on the surface improves the contact efficiency between the sulfate radicals and the pollutants, thereby promoting its catalytic performance. Such molecularly imprinted catalysis materials have an enormous potential for waste water treatment.
危险品化学品经营许可证（带存储）