Preparation And Adsorption Properties Of Multi-Walled Carbon Nanotubes Surface Phenol Imprinted Materials

Due to the polymers synthesized by molecular imprinting technique have pre-structure shape, specific recognition and practicability, it has received extensive attention of research workers. Since traditional polymerization methods have many shortcomings, such as time-consuming、laborious、low yield and the highly cross-linked, make it difficult to elute template molecules and embedded too deeply, cause adsorption equilibrium longer, these make its use is restricted. And multi-walled carbon nanotubes is one kind material which has high specific surface area, high surface energy and high reactivity, that make it naturally become the carrier of molecularly imprinted polymers preferred material. In order to make up the disadvantages of the traditional bulk polymerization, we use of the excllent properties of multi-walled carbon nanotubes, surface was proposed beased on multi-walled carbon new molecularly imprinted material, the recognition site distribution on the surface of molecularly imprinted polymer, it can rapidly spot template molecule and improve the specific compound in the medium accessibility, and make multi-walled carbon nanotube molecular imprinting surface materials exhibit a wide application in the field of enrichment of trace substances prospect.In this paper, the specific contents are as follows:(1) With phenol as template molecule, a novel composite imprinted material was synthesized by a surface molecular imprinting polymerization method. Optimization of preparation conditions and adsorption conditions. The scanning electron microscopy and infrared spectroscopy were used to characterize the morphology of phenol imprinted material, the dynamic adsorption and isothermal adsorption were studied by UV spectrophotometry, and performed Scatchard Model analysis. The results showed that MIPs was grafted to the surface of MWNT successfully. The maximum adsorption capacity of phenol imprinted materials reached 25.50mg/g, when the dynamic adsorption 60 min, the adsorption capacity reached 90% of the maximum amount of adsorption, adsorption close to balance, the maximum imprint factor for the template was 3.64, maximum selectivity for the template was 2.78, indicating that the imprinted materials have better specific adsorption properties.(2) A novel molecular imprinted polymers based on SiO2-modified multi-walled carbon nanotubes was successfully prepared by a sol-gel method using phenol as a template molecule. The structure and morphology of the imprinted polymeric material were studied by scanning electron microscopy and X-ray diffract meter. The dynamic adsorption and isothermal adsorption were studied by UV spectrophotometry, through the determination of the adsorption of phenol analogues of molecularly imprinted materials specificity adsorption performance. Experimental results showed that the surface of MWCNTs synthesized imprinted layer of phenol successfully. This material imprinted template molecules apparent maximum amount 19.90 mg/g, there is only one binding site, the maximum imprint factor for the template was 3.48, maximum selectivity for the template was 3.44, and the molecularly imprinted materials achieve dynamic adsorption equilibrium in 120 min. Thus the imprinted material have a large number of binding sites and adsorption capacity.(3) Put the prepared phenol imprinted material into the solid phase extraction column for cosmetics phenol enrichment and separation, combined with high performance liquid chromatography(HPLC) method for determination. Experimental results showed that phenol molecularly imprinted materials used as solid-phase extraction material applied to the solid phase extraction, and combined with the of high performance liquid chromatography separation enrichment of phenol in cosmetics successfully.