Synthesis Of P-tert-butyl-calix[4] Arene Derivatives And Theirs Adsorption Properties Of Thorium

Calixarenes was considered as one of the best representatives of the subject of thethird generation of supramolecular compounds. In the thirty years, the synthesis andapplication of calixarene has become a new focus areas of chemical research. On thephysical and chemical properties of these calixarene derivatives with uniqueproperties, have already widely applicated in these fields such as identification ofmolecular ion, nanotechnology, functional materials, catalysis, chromatograph. Thispaper studied calixarene derivatives, including the preparation the performance andthe study of the material on the absorption application of thorium(Ⅳ). The articlemanily includes the following three chapters:Chapter one: Manily focuses on profiles of thorium and chitosan, overview andapplication of calixarene, and the main contents of the paper. At last, based on theconcerning our experiment conditions, the research proposal for this thesis waspresented.Chapter two: P-tert-butylcalix[4]arene[PTBC] and its derivativep-tert-butylcalix[4]arene acetic acid[PTBCA] have been synthesized and theiradsorption properties studied for Th4+. Mass Spectrometry（MS）, Proton NuclearMagnetic Resonance Spectra(HNMR), Fourier Transform InfraredSpectroscopy(FT-IR) and Thermal Gravimetric-Differential Scanning Calorimetry(TG-DSC) were used to analyze them. And special FT-IR and Scanning ElectronMicroscopic(SEM) was used to make sure of the results of adsorption. UV-visspectrophotometriy analysis shows that the adsorption of thorium using the PTBCAcan reach adsorption equilibrium within2h under the condition of pH=3andtemperature of30℃. The adsorption rate is72%and the adsorption capacity is up to9.0mg/g. Interfering ions research shows that calixarene derivatives with a carboxyl group is expected to be a good adsorbent for Th4+.Chapter three: The introduction of the natural macromolecular polymer chitosan tocalixarene (host molecules) and then P-tert-butylcalix[4]arene-chitosan polymer wasprepared. The polymer was used to adsorb thorium(Th4+) and compare it with theadsorption properties of chitosan. The experiment results show that calixarene-chitosan is a better performance of the two and the optimum adsorption pH of3.5, andthe adsorption capacity is up to44.7mg/g. Article also discusses the isothermaladsorption models and dynamics adsorption of polymer, showed isothermaladsorption data more in line with the Langmuir adsorption isothermequation(R=0.9982) and adsorption kinetics are more in line with the second-orderkinetics model(R=0.9978).