Studies On Fluorescent Probes Of Thorium(Ⅳ) Ion Based On Schiff Base

Thorium, which is an important nuclear fuel, has wide applications in variousfields. But as is known to us, thorium poses a significant threat to the humans, animals,environment due to the severe radioactive and toxicological effects on livingorganisms. So, precise determination and extraction of trace thorium in environmentaland geological materials is particularly significant. There are many ways for thoriumion detection nowadays, but it is still difficult to separate, preconcentrate anddetection the trace/ultratrace thorium ions in complex system of environmental,biological samples and solution. The study of fluorescent sensors is a significant fieldin nowadays owing to its high sensitivity and operational simplicity. Moreover, thefluorescent molecular imprinting polymer sensor is one of them, which is also asignificant research due to the recognition ability, predetermined selectivity and highsensitivity of molecular imprinting polymers. It can be used for the separation ofmetal ions in the solid phase extraction and analysis of detection. This dissertation isdivided into three parts, as follows:1. A briefly summarization is given for the separation and preconcentration ofthorium, the definition, structure and application of the fluorescent molecularimprinting sensor, molecular imprinting technique, and the application status offluorescent molecular imprinting sensor.2. The fluorescent probe based on Schiff base N,N’-bis（3-allylsalicylidene）o-pheny-lenedia-mine （BASPDA） for the detection of Th4+ion was described. A approach wasdeveloped for the detection of Th4+based on BASPDA as fluorescent probe. Theinfluence of various factors for BASPDA and Th（IV） complex were studied, such assolvents, pH, concentration, interfering ion and so on. The linear range was1.0×10^-7mol·L^-1-2.9×10^-5mol·L^-1, and the detection limit was0.5×10^-7mol·L^-1. 3. A new Schiff base4-[（3-Allyl-2-hydroxy-benzylidene）-amino]-1,5-dimethyl-2-phenylpyrazolidin-3-one（MDASAP） and its Th（IV） complex were synthesized. Thefluorescent molecular imprinting polymer sensor was synthesized with thorium ion astemplate and MDASAP as fluorescent functional monomer based on imprintingtechnology, and the fluorescence emission spectral properties of the sensor fordetection of Th4+were studied.