Preparation And Adsorption Performance Research Of Solenesol Molecularly Imprinted Polymers

This paper focused on the separation and purification of solanesol by molecular imprinting technology, the solanesol molecularly imprinted polymers (MIPs) were prepared through solution polymerization and surface imprinting method, respectively. The work was organized as follows:1. MIPs were synthesized in the porogen of chloroform by using solanesol (SA) as the template molecule, N-vinypyrrolidone (NVP) and acrylic acid (AA) as functional monomers, azodiisobutyronitrile (AIBN) as initiator and ethylene glycol dimethyl acrylic ester (EGDMA) as cross-linker. The key fabrication variables, such as the amount of monomers, crosslinker, initiator, the polymeration time and temperature were optimized systematically by calculating the adsorption capacity and separation degree of MIP to SA. The optimum conditions obtained were:the molar ratios among SA, AA/NVP and EGDMA were1:4:20, and the optimal polymerization temperature and time were63℃and24h, respectively. At the optimum conditions, the obtained MIP displayed high adsorption selectivity in the mixture of SA and triacontanol (TA), the separation degree of MIP to SA was as high as3.5. Thereafter, the structure of SA-MIP was characterized by both Fourier transform infrared (FTIR) using non-imprinted molecular polymer (NMIP) as contrast. Moreover, the adsorption thermodynamic and kinetics of the SA-MIP were also studied. The results showed that pesudo-first-order kinetics and Freundlich model were suitable well of the adsorption behavior of the obtained MIP.2. Titanium dioxide particles were modified by silane coupling agent KH570firstly, and the modified conditions were determined as follws:the mesh number of titanium dioxide particles was between120and150, the modification temperature and time were45℃and24h, the volume of KH570was60mL, and the pH of the modified environment was6, respectively. After that, by using surface imprinting method, solanesol surface MIP (SA-SMIP) was prepared with modified titanium dioxide as solid phase substance, SA as the template molecule, methyl methacrylate hydroxyl ethyl ester (HEMA) as functional monomer, AIBN as initiator and EGDBA as cross-linker, polyvinyl alcohol (PVA) and Span80as composite suspended dispersant. With the the adsorption capacity and separation degree of MIP to SA in the mixture of SA and TA, the amount of monomers, crosslinker, initiator, the polymeration time and temperature were optimized systematically. The obtained optimum conditions were as follows: the molar ratios of SA to HEMA and EGDMA were1.5:1and1:22, the optimal polymerization temperature and time were68℃and28h, the amount of AIBN was2.5%, and the dosage of Span80was1.0g, respectively. At the optimum conditions, the separation degree of MIP to SA was2.89. Thereafter, the structure of SA-MIP was characterized by FTIR using NMIP as contrast. Moreover, the adsorption thermodynamic and kinetics of the SA-SMIP were also studied. The results showed that pesudo-second-order kinetics model and Langmuir model were suitable well of the adsorption behavior of the obtained SMIP.3. Silicon dioxide particles were modified by silane coupling agent KH570firstly, and the modified conditions were determined as follws: the modification temperature and time were40℃and30h, the volume of KH570was60mL, and the pH of the modified environment was6, respectively. After that, by using surface imprinting method, SA-SMIP was prepared with modified silicon dioxide as solid phase substance, SA as the template molecule, NVP and AA as functional monomers, AIBN as initiator and EGDMA as cross-linker, PVA and Span80as composite suspended dispersant. With the the adsorption capacity and separation degree of MIP to SA in the mixture of SA and TA, the amount of monomers, crosslinker, initiator, the polymeration time and temperature were optimized systematically. The obtained optimum conditions were as follows: the molar ratio of SA and EGDMA was1:16, the molar ratio of NVP and AA was3:2, the optimal polymerization temperature and time were64℃and22h, the amount of AIBN was2.0%, and the dosage of Span80was0.8g, respectively. At the optimum conditions, the separation degree of MIP to SA was as high as5.07. Thereafter, the structure of SA-MIP was characterized by FTIR using NMIP as contrast. Moreover, the adsorption thermodynamic and kinetics of the SA-SMIP were also studied. The results showed that pesudo-second-order kinetics model and Langmuir model were suitable well of the adsorption behavior of the obtained SMIP.