Design, Synthesis And Application Of Multifunctional Organic-inorganic Hybrid Fluorescent Nanocomposites

Organic fluorescent molecule probe because of its fast response, high sensitivity, good selectivity and high detection limit, is gradually applied to detect metal ions of environmental science and biological system. This paper grafted organic fluorescent molecular probes on inorganic nanomaterials, and used to detect metal ions of environmental and biological samples, which is a simple and effective method to design and synthesize multifunctional sensing composites for simple detection and efficient removal of metal ions in environmental and biological samples.1. Fibrous silica spheres (KCC-1) were synthesized by solvothermal reaction and template method. Then the multifunctional fluorescent nanocomposites (RB-KCC-1) were prepared by the immobilization of a rhodamine-based receptor (RB-Si) within the channels of fibrous silica spheres (KCC-1), and characterized by various instruments. This multifunctional sensor exhibits excellent optical sensing properties that allow for highly selective, sensitive and "naked eye" Hg2+ detection. In additional, it is also an excellent adsorbent for the removal of Hg2+ from aqueous solution, the equilibrium adsorption capacity is 115.47 mg g-1. These results indicate that these multifunctional composites may be potential and promising materials for the facile detection and effective removal of Hg2+ in biological, environmental, and industrial fields,2. Core-shell magnetic fibrous silica spheres (Fe3O4@SiO2@KCC-1) were fabricated by solvothermal, sol-gel method and template method. Then a multifunctional core-shell magnetic fibrous silica sensing probe AQ-Fe3O4@SiO2@KCC-1 was synthesized by the immobilization of the quinoline-based receptor AQ-Si onto the inner surface of magnetic fibrous silica material (Fe3O4@SiO2@KCC-1), and characterized by various instruments. The experimental results suggested that this functional material exhibited enhanced fluorescence in the presence of Zn2+ ions and a high selectivity for Zn2+ over the competing metal ions in aqueous solution. Furthermore, the multifunctional hybrid material AQ-Fe3O4@SiO2@KCC-1 can also efficiently separate Zn2+ from the aqueous solution with high surface area and external magnetic field, and possesses good adsorption capacity (157.24 mg g-1).3. Core-shell magnetic silica spheres (Fe3O4@SiO2) were synthesized by co-precipitation method and water-in-oil micro-emulsion method. Then the multifunctional fluorescent nanocomposites (RB-Fe3O4@SiO2) were prepared by the immobilization of a rhodamine-based receptor on the face of magnetic silica spheres (Fe3O4@SiO2), and characterized by various instruments. This multifunctional sensor exhibits excellent optical sensing properties that allow for highly selective, sensitive and "naked eye" Hg2+ detection. Furthermore, it is also an excellent adsorbent for the removal of Hg2+ from aqueous solution. These results indicate that these multifunctional composites may be potential and promising materials for the facile detection and effective removal of Hg2+ in biological, environmental, and industrial fields.