| Polymer adsorbents are an important class of functional polymer materials, they are of great significance in the basic and applied research. With the development of high-tech research in the field, more and more demands are put forward on functional polymer adsorbents. To face these demands, a series of magnetic polymer adsorbents with the properties of easy to separated, rapid adsorption speed, high adsorption capacity and regenerated were designed and synthetized. At last, a novel multifunctional magnetic material that could simultaneously detection and adsorption of heavy metal ions was designed and synthetized. And the obtained materials were characterized and tested for their properties.Specifically, this paper carried out the following aspects of research and exploration:1. Study on preparation and properties of hybrid magnetic adsorbent Fe3O4@PGMA-TETA.A hybrid magnetic adsorbent Fe3O4@PGMA-TETA (FPT) was prepared by suspension polymerization and subsequent chemical modification. The synthetic materials were characterized using FT-IR, TEM, VSM and Elemental Analysis. The adsorption properties of FPT on Hg(II) was studied by batch method, and the effects of contact time, pH, and the initial ion concentration on adsorption of Hg (Ⅱ) were studied. The results showed that FPT had a outstanding adsorption property on Hg(II). Adsorption equilibrium could be achieved within15min, and the maximum adsorption capacity was found to be416.66mg/g. The adsorption process fix pseudo-second-order models and Langmuir isothermal well, and chemical adsorption was the main adsorption mechanism. FPT could be regenerated in5%thiourea solution after adsorption Hg(Ⅱ) and reused for six times without any obvious reduce in adsorption capacity for Hg(Ⅱ). FPT showed super paramagnetism, could be rapidly separated from adsorbate solution using a permanent magnetic magnet.2. Study on preparation and properties of a regenerated magnetic adsorbent with excellent adsorption property.Atom transfer radical polymerization (ATRP) was used to prepare magnetic polymer materials Fe3O4@SiO2@PGMA (FSP) by graft poly(glycidyl methacrylate)(PGMA) on the surface of Fe3O4@SiO2(FS). Subsequently, amination reaction was carried out on FSP, obtained a novel magnetic polymer adsorbent Fe3O4@SiO2@PGMA-TETA (FSPT). FSPT was characterized using FT-IR, TEM, VSM and Elemental Analysis. The adsorption property of FSPT on Hg(Ⅱ) was studied in batch method, and the effects of contact time, pH and the initial ion concentration were researched. Results showed that FSPT had excellent adsorption property on Hg (Ⅱ). The adsorption equilibrium could be achieved within5min, and the maximum adsorption capacity was found to be909mg/g. When the initial concentration of Hg (Ⅱ) was in the range of50-1000mg/g, above97.5%of Hg(Ⅱ) could be removed by FSPT. The adsorption process fix pseudo-second-order models and Langmuir isothermal well, and chemical adsorption was the main adsorption mechanism. FSPT-Hg(Ⅱ) could be regenerated in5%thiourea solution and no obvious reduce in adsorption capacity for Hg(Ⅱ) was found after seven adsorption-desorption recycles. FSPT showed super paramagnetism, and could be rapidly separated from the adsorbate solution using a permanent magnetic magnet.3. Research on the preparation and properties of a novel multifunctional magnetic material.A fluorescent molecular probe was successfully synthetized in this work, and was combined on Fe3O4@SiO2@PGMA (FSP) prepared by ATRP method, resulting in a novel multifunctional magnetic material (FSPR) that could simultaneously detection and adsorption of Hg(Ⅱ). The fluorescent response, selectivity and adsorption to Hg(Ⅱ) are investigated, respectively. FSPR showed particular response to Hg(Ⅱ) in acetonitrile solution; and FSPR could removal Hg(Ⅱ) due to coordination effects. |
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