The Preparation Of Functional Magnetic Nanomaterials And The Application Study Of Pollutants In Wastewater Treatment

In recent years, with the industrial continued development, the pollution of heavymetals and antibiotics from wastewater has become one of the major environmentalproblems of the world. Adsorption method have many advantages which the traditionalmethods have not when they are used to remove pollutants from the water.But theseparation of adsorbent and bad regeneration which limits the practical application ofthem. Magnetic nanomaterials are widely used in many fields because of superioritiesinclude large specific surface area, good biocompatibility, easy separation andeasy-surface-functionalization. However, reports in the area of water treatment arerelatively scarce. For this, this thesis commits at preparing some kinds of lowprocessing cost, renewable ability and environmentally friendly adsorption materials,aiming at the removal of heavy metal ions and antibiotics from the water environment.(1)A novel Cu(II) magnetic molecularly imprinted polymers (Fe3O4@SiO2-MIP)was synthesized. The Fe3O4@SiO2-MIP magnetic nanomaterials were characterizedSEM, XRD, BET, FT-IR and VSM. Moreover, the adsorption performance wasresearched. The results showed that the adsorption capacity was23.31mg/g and theadsorption rate up to95%at pH of7.0.Adsorbed Cu(II) was desorbed with0.1mol/Lhydrochloric acid to investigated the renewable properties of magnetic molecularlyimprinted materials. The Langmuir adsorption model was more favorable than theFreundlich adsorption model. The adsorption was better served a HO second-orderkinetic model.(2) Amino-functionalized magnetic multi-walled carbon nanotubes(NH2-mMWCNTs) were synthesized through an hydrothermal method. The syntheticmaterials have been characterized by modern analytical methods, and various factorsinfluencing the process of adsorption were discussed. NH2-mMWCNTs havesuperparamagnetism and the specific area was86.174m2/g and havesuperparamagnetism. The results showed that the adsorption capacity could reach38.89mg/g under the best conditions of adsorption. Langmuir isotherm adsorptionmodel was well describes the adsorption of tetracycline by NH2–mMWCNTs underdifferent temperature and adsorption kinetics accord with the HO pseudo-second-ordermechanism. (3) Magnetic ascorbic acid-coated Fe3O4nanoparticles were synthesizedand characterized, which showed that the as-synthesized ascorbic acid-coated Fe3O4nanoparticles have a high specific surface area of about213.79m2/g. The main factorsaffecting the uptake behavior were studied. The adsorption data showed that absorptioncan be up to98%at pH of4with a maximum adsorption capacity of44.9mg/g forCu(II). Adsorbed Cu(II) could be eluted with hydrochloric acid which the concentrationis0.15mol/L and the enrichment multiple was12. The adsorption thermodynamics ofCu(II) was in line with the Freundlich adsorption model, at the same time, the HOsecond-order kinetic equation was depicted the adsorption dynamics behavior.