The Preparation And Characterization Of Magnetic Recognition Material For Thorium(Ⅳ) With Salophen

There are many ordeal problems in the world, the shortage of energy sources isone of the most important in them. Thorium is the nuclear element instead of uraniumto become the main nuclear source in the future. It is necessary to develop the reliablemethods for the determination and recovery of thorium in environmental andgeological samples due to its radioactivity and chemical toxicity to human body andenvironment. Ion imprinted technique is a technique based on the development ofmolecular imprinting technique in the solid phase extraction technique, using metalion as the imprinted templates, so it can achieve the goal of the high selectiveextraction to metal ion. Magnetic ion imprinted polymer not only has highly selectiveand specific recognition ability of ion imprinted for the template, but also has theparamagnetic properties of magnetic particles, can be rapidly separated from thesolution in the presence of an external magnetic field. This dissertation consists ofthree parts, as follows:1．A briefly summarization is given for the separation and preconcentration ofTh(Ⅳ), the ion imprinting technique, the complexes of salophen/salen with metal ionsand the application of magnetic imprinting polymers.2．N,N’-bis(3-allyl salicylidene)o-phenylenediamine and its complexes withTh(Ⅳ)(Th(BASPDA)2) were synthesized, and the crystal structure of Th(BASPDA)2was determination by the X-ray diffraction. In addition, the characterizations of thecomplexes are determination by the IR, ultraviolet absorption, thermo gravimetricanalysis and fluorescence spectrum.3．The magnetic Th(Ⅳ)-imprinted polymers were prepared by surface-graftedtechnology on the surface of vinyl-functional magnetic particles with h(BASPDA)2complexes as the functional monomer and template. The structure and property of the magnetic imprinting particles was characterized by IR, XRD and SEM. In the staticmethod, the effect parameters of magnetic imprinting adsorbent for Th(Ⅳ) werestudied. The maximum adsorption capacity was42.54mg/g at pH4.5, which isapproximately three times larger than non-imprinting matetial, and the relativeselectivity coefficient values of the imprinted adsorbent for Th(Ⅳ)/La(Ⅲ),Th(Ⅳ)/Ce(Ⅲ), Th(Ⅳ)/U(Ⅵ) and Th(Ⅳ)/Rb(Ⅲ) were82.2，93.1，62.4and21.0thannon-imprinted adsorbent.