Preparation And Using Of Ramification Of β-Cyclodextin

Cyclodextrins is one kind of natural green chiral polymer compound, and has wideapplication prospects in environmental analysis, flavor packet and processing,polymer synthesis process, pharmacy and separation of chiral drugs fields. Due to itsdefects such as soluble and poor mechanical performance, it could be difficult forsimple cyclodextrins to be further developed and utilized in solid phase extraction,liquid phase separation areas and so forth. Therefore, how to solve the currentcyclodextrins derivative solid phase for better separation in better application field isvery urgent and important. Using cheaper prices and easy-get, grain size controllable,good mechanical properties, good thermal stability and acid-alkali resistant of siliconmaterials as a solid phase carrier, cyclodextrins will be grafted on its surface to form akind of new functional materials, which will be a good choice. Therefore, this paperstudied β-cyclodextrin derivatives, including the preparation, the performance and thestudy of the material on the application of Th（Ⅳ）. This paper mainly includes thefollowing four aspects:1. The research report and review concluded had studied the β-cyclodextrins inprofiles, the β-cyclodextrins derivatives in environmental analysis, flavor, polymerfield, pharmacy field and chiral separation field, and the feasibility analysis had madeon the topics proposing and the direction of the research subjects.2. The inclusion complex of dibenzoylmathane with β-cyclodextrin was studied.UV-spectrophotometer was used to investigate the complexation behaviour in liquidmedium, and to demonstrate that the DBM aqueous solubility increased7.26timesdue to complexation with β-CD and the inclusion rate of DBM was high to93.31percent and the drug-loading constant was also high to35.4mg/g. Solid samples wereprepared by solution-agitating method. FT-IR was employed to assess the formationof the inclusion complex. Dissolution analysis indicated that dissolution properties of DBM/β-CD complex were superior compared to both pure DBM and thecorresponding physical mixture of DBM and β-CD.3. An adsorption material with stable property and good resistance to acidity orbasicity environment and so forth was prepared by β-cyclodextrins grafted to thesurface of silica gel using aminated silica gel as solid phase carrier, epoxychloropropane as crosslinking agent. The chelator dibenzoylmethane was employed toassist the rapid adsorption of thorium. The materials can be reused for many times.X-ray photoelectron spectroscopy（XPS）was used to analyze the surface properties ofthe experimental materials to confirm the reliability of the synthetic materials.Scanning electron microscope （SEM） was employed to characterize the surfacemorphology of the material, FT-IR was used to analysis the materials before and afterthe adsorption of thorium, and UV spectrophotometer was employed to determine theconcentration of thorium after the adsorption. The adsorption of thorium using thematerial prepared could achieve equilibrium within3hours at room temperatureunder the condition of pH=2-3. The adsorption capacity was7.8mg/g, and theadsorption rate was up to78percent. In addition, the maximum allowedconcentrations of interfering ions were found to be25mg/L for Fe³⁺or Al³⁺, and20mg/L for Ca²⁺, Zn²⁺, Fe²⁺, Mg²⁺, or Cu²⁺.4. The adsorption of Th（Ⅳ） was studied using a novel dibenzoylmethanemolecular imprinted polymers, which was prepared using acryloyl-β-cyclodextrin as amonomer on surface modified functional silica gel. X-ray photoelectron spectroscopy（XPS） and FTIR were employed to confirm the reliability of the synthetic polymer.Scanning Electron Microscope （SEM） was used to analyze the surface properties ofthe experimental materials. UV-spectrophotometer was employed to investigate theadsorption property and the concentration of Th （Ⅳ）. Adsorption kinetics andadsorption isotherm were carried out. In pH3.5, the adsorption equilibrium couldreach a balance in45minutes, the resultant adsorbing capacity was30.8mg/g, and theremove ratio of Th（Ⅳ） was88.1%.