The Synthesis Of Chelate Adsorbent Molecular And Applied Research For The Heavy Metal Ions Of Hg²⁺、Cd²⁺

Heavy metal ions in human development and life has been playing a very important role, some metal ion is an indispensable element of human metabolism, sometimes when the body is intaking too much or short of metal ions, it will cause a lot of diseases, such as Hg2+, Cd2+, Pb2+, etc., through the food chain and eventually they will bioaccumulate, suffered damage to the body. Therefore, the analysis and detection of heavy metal ions is particularly important, and the design and synthesis of high selectivity and high sensitivity for the detection of heavy metals in the chelating molecule is one of the methods currently more concerned. In this study, based on crown ethers, quinoline, rhodamine good photophysical properties, three chelating molecules synthesized and studied its use spectroscopy to identify performance, as follows:(1) Miscellaneous crown ethers as the raw material, we were synthesized the crown ethers chelating molecules for mercury ions, called compounds A, and measured the fluorescence. The results show that the compound A on Hg2+ with good fluorescence response, and has a more the ability of anti-jamming capability and high selectivity identified. Meanwhile, the synthesized compound A which have the ability to self-assembly, may be incorporated into the molecular aggregate, the constituent material A. This material may well identify Hg2+, and Hg2+ complexation ratio of 1: 1, the detection limit was 5.01x10-7M.(2) With 8-hydroxy quinoline-2-carboxaldehyde as raw materials, we designed and synthesized the quinoline chelating sorbent molecules for cadmium ion, compounds B, spectroscopy test results show that the compound B on Cd2+ has a good ability to selectively recognize and anti-jamming capability. Meanwhile, synthesis of the modified magnetic support having-NH2 material Fe3O4@SiO2 nanoparticles, and hybridizing with the compound B to obtain a hybrid material B, by testing show that the hybrid material is suitable as a detector material cadmium ions.(3) Rhodamine-6G as raw materials, we designed and synthesized for the rhodamine molecules adsorbent chelate mercury ion, compound C, measured by UV absorbance and fluorescence intensity, the results show that the compound C for Hg2+ has a higher selective recognition the ability and the ability of anti-jamming. Meanwhile, synthesis of the magnetic base material having a-HS modified Fe3O4@ SiO2 nanoparticles, and C were hybridized with the compound obtained hybrid material C, by the tests show that the hybrid material is suitable as a detection material mercuric ions.