| Molecularly imprinted polymer(MIP) is a new kind material for selectively adsorptive of fuel, which is very important for deep desulfurization of oils. In this paper, the bare Fe3O4 nanoparticles are endowed via the solvothermal method. Adding silica coatings to magnetite nanoparticles and using the carbon-carbon double bond on the surface of silicon dioxide (SD2) modified by 3-(methacryloxy)propyltrimethoxysilane (MPS). Magnetic core-shell molecularly imprinted polymer microspheres (Fe3O4/SiO2@MIPs) are prepared by distillation precipitation polymerization using dibenzothiophene (DBT) as template molecule and methacrylic acid (MAA) as functional monomer. The core-shell structure, morphology are systematically characterized. In conclusion, The monodisperse Fe3O4/SiO2@MIPs display excellent characteristics, such as good thermal stability and high saturation magnetization. The adsorption capacity of Fe3O4/SiO2@MIPs for DBT in n-hexane solution reach 149 μmol/g within 150 min than non-imprinted polymer (Fe3O4/SiO2@NIPs). The adsorption behaviors towards DBT follow the Freundlich isotherm equation and conform well to pseudo-second-order kinetic model. All of the above results imply that the magnetic imprinted microspheres increase the potential application of MIPs in desulfurization.In order to further increase adsorption capacity of imprinting polymer and simutaneously to realize selective adsorption of analogues, resulting in one-time removal of different sulfur compounds. A novel hollow molecularly imprinted polymer (H-MIP) with many pores is prepared by distillation precipitation polymerization of methacrylic acid (MAA) on surfaces of SiO2 spheres with benzothiophene (BT) and dibenzothiophene (DBT) as dual template, subsequently treate by removal of SiO2 spheres. The results show that the hollow molecularly imprinted polymer (H-MIP) has a excellent selective adsorbability for BT and DBT, reaching to 188 μmol/g and 212 μmol/g, respectively and can be reused. |
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