Amidoxime Chelating Separation Of Functional Materials Radiation Technology Synthesis

A functional material for chelating separation with amidoxime group, is often used in heavy mental ions' (including Uranium, Thorium, rare mental) absorption and enrichment, radiochemical separation and radiochemical waste water disposal. It is also the best material to extract Uranium from sea water due to its special functional group's structure and excellent absorption property.In this study, a new functional material of this kind was synthesized by amidoximation reaction of SDB-AN, which was the irradiation grafting product of acrylonitrile(AN) and polystyrene-divinylbenze (SDB).FT-IR, SEM and TG confirmed that SDB was a polymer with excellent resistance to irradiation. And the peroxides produced in pre-irradiation initiating grafting reaction, which was also confirmed. The pre-irradiation grafting reaction was influenced by many factors such as absorbed dose, AN concentration, reaction temperature and reaction time. The results showed that the best condition was irradiated at 2400kGy, chosen 1:7 acrylonitrile monomer/water ratio and reacted at 80℃ for 3h. Then the SEM was used to observe the microstructure of SDB-AN. Because the need dose in pre-irradiation grafting was too high, mutual radiation grafting was then studied. It was found that two factors, the absorbed dose and the AN swelling degree in SDB influenced the grafting reaction.The structure of SDB-AN obtained through two irradiation grafting methods was characterized by FT-IR. There were absorbing peaks of C-O and C=O in pre-irradiation grafting SDB-AN, but no in another. The appearance of SDB-AN was described by optical microscope photos. Comparatively, Pre-irradiation grafting products took priority.After grafting, the target functional group was introduced to SDB-AN by amidoximation reaction in hydroxylamine hydrochloride solution, and SDBAO with satisfied properties was synthesized. In this step SDB-AN synthesized by pre-irradiation grafting was used. The reaction was influenced by AN grafted percentage, hydroxylamine hydrochloride concentration, reaction temperature and reaction time. FT-IR and SEM indicated SDBAO being synthesized successfully. The results showed that the best condition was in 0.9mol/l hydroxylamine hydrochloride solution at 80℃, PH=7 for 2.5h.In this process, SDB was changed from a non-polar substrate to SDBAO, which was a polar polymer with excellent separation property. The synthesis of SDBAO by irradiation supplied a theory basis and experiment data for the subsequent work as well as a novel way for other related functional materials.