Study Of Fluorescent Probe For Environmental Metal Ions And Environmental Restoration

Very recently, the combination of nanomaterials used as solid supports and supramolecular concepts has led to the development of hybrid materials with improved functionalities. It can bridge the gaps between molecular chemistry, materials science and nanotechnology, Because of the reversible building of nanometersized networks and 3D architectures as well as biomimetic and gated chemistry in hybrid nanomaterials, the development of advanced functional protocols in three dimensional frameworks has become the hot topic. On the other hand, macromolecular compounds used as solid supports have compelled many investigators to work with it.A new rhodamine B based on chemosensor rhodamine-B methionine methyl ester (RM) was synthesized and structural characterized. It can be used for the selective detection of Hg2+in aqueous solution and was not affected by alkali and alkali-earth, transition and heavy metals, RM can detect Hg2+in a large pH range from 4 to 9, excellent sensitivity to Hg2+level lower to ppb(part per billion). Inorganic-organic hybrid fluorescence chemosensor RMS was prepared by immobilizing RM to the mesoporous silica material SBA-15 via triethoxysilane groups, the fluorescent intensity shows well-fitted linearity with the concentration of Hg2+in aqueous solution, according to ion chromatography (ICP),70.4%of Hg2+being extracted by RMS, suggesting the possibility of RMS for potential application in environmental restoration.A new glucose-based CG1 and CG2 have been synthesized by glucosamine and coumarin for the recognition of Fe3+. Both CG1 and CG2 result in fluorescent enhancement in the presence of Fe3+in aqueous solution. Chemically modified chitosan CO1 and CO2 were also synthesized by chitosan oligosaccharide and coumarin, they can also be used to recognize Fe3+in aqueous solution. We observed that addition of Fe3+to aqueous solution of CO1 and CO2 increase the fluorescence intensity larger compared with CG1 and CG2. Besides, chitosan can adsorb metal ions and can be used as membrane material, so solid material CC1 and CC2 were prepared to adsorb Fe3+, according to ion chromatography (ICP),61.4%of Fe3+being extracted by CC1. CC1 is a potencially adsorbent for Fe3+and can be used in environmental cleanup.