Synthesis, Characterization And Application Of Magnetic Recyclable Multifunctional Materials In Water Treatment

Environmental degradation and energy shortage has become an increasingly serious global problem. New materials, development of new technologies to solve environmental and energy issues provides an unprecedented opportunity. With high magnetic susceptibility and high saturation magnetic flux density, external magnetic field can be achieved quickly, easily separated, so that in water pollution treatment, catalysis, drug control separation, purification and other fields of biological molecules release and has broad application prospects, has become the focus of domestic and foreign academic research, this paper Fe3O4@SiO2 core-shell structure of magnetic materials for the carrier, by grafting on its surface organic functional groups to build a new type of adsorbent and catalyst heterogeneous Fenton, then system the new functional materials recyclable catalytic degradation of organic pollutants in water and H2O2 removal performance and mechanism of adsorption of heavy metal ions in water. At the same time, research on materials synthesis conditions of synthetic materials characterization systems, the main contents and results are as follows:The first part:use hot standby solvent method of magnetic iron oxide nano-particles in a magnetic nanomaterials by TEOS surface coated with silica shells, and then use the APS amino silica surface access, then access, miscellaneous organic nitrogen functional groups, and to generate in situ and Cu2+ ligand to form Cu (Ⅱ) based catalyst Cu-Py/Fe3O4@SiO2. Transmission electron microscopy (TEM), scanning electron microscope (SEM), infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), vibrating magnetometer and other analytical techniques for the synthesis of the function of the catalyst were characterized; copper ions through the surface of the catalyst load index to optimize the amount of catalyst synthesis conditions. Meanwhile, Rhodamine B (RhB), methylene blue, methyl orange,4-dinitrophenol probe pollutants Catalyst evaluation catalytic synthesis of H2O2 degradation of performance goals pollutants, stability (reuse, antacid capacity, the loss of copper ions)The second part:the Box-Behnken experimental design, systematic study of factors affecting Cu-Py/Fe3O4@SiO2 catalytic Degradation of RhB with H2O2, optimizing optimum degradation of experimental conditions. The results showed that at pH 6.36, the amount of catalyst 1.34 g·L-1,H2O2 dosage of 0.128 mol·L-1, the reaction 60 min, RhB (15 mg·L-1) degradation rate of 98.6%.The third part:The power of miscellaneous organic nitrogen Fe3O4@SiO2 as an adsorbent material, explore dynamics, thermodynamics and mechanism of adsorption removal of heavy metal ions Cd2+ performance, influencing factors, adsorption. The results showed that the synthesis of functional magnetic materials for Cd2+with excellent lower adsorption performance, pH= 6, adsorbent dosage of 1.2 g·L-1, the adsorption capacity of 210 mg·g-1; adsorption isotherm line with Langmuir, Freundlich isotherm line model describes the adsorption kinetics followed two kinetic model, a chemical adsorption.