Synthesis And Properties Of Cu(Ⅱ) Magnetic Imprinted Absorbent

In this work, Fe3O4magnetic nanoparticle was prepared by coprecipitation method. Then ethyleneamine (PEI or DETA) with excellent chelating ability was coated on the surface of Fe3O4magnetic nanoparticle by silane coupling agent to prepare magnetic sorbent. By testing and analyzing the properties of magnetic sorbent, the mechanism of adsorption capacity was discussed.The summarized conclusions of this paper are follows:(1)Polyethylenimine (PEI) was coated on the surface of Fe3O4nanoparticle by silane coupling agent KH560, then adsorbed Cu2+as template and was crosslinked by crosslinker. The saturation magnetization of this magnetic adsorbent PEI/Fe3O4-MIIP was28.86emu/g. The infrared and thermal gravimetric analysis showed that polyethylenimine had been coated on the surface of Fe3O4nanoparticle, and the amount of PEI adsorbed layer was about10%of PEI/Fe3O4-MIIP. According the adsorption tests, the maximum adsorption capacity of PEI/Fe3O4-MIIP was21.35mg/g, which was as2times as that of the PEI/Fe3O4-MNIP. The relative selectivity coefficient was higher than1, which indicated that PEI/Fe3O4-MIIP had an impressed imprinting ability. The adsorption kinetic experiments showed that the adsorption equilibrium of PEI/Fe3O4-MIIP achieved after only30minute. After5times reuse, the adsorption capacity of PEI/Fe3O4-MIIP merely decreased. In conclusion, the magnetic sorbent PEI/Fe3O4-MIIP integrated the advantages of magnetic material, and had an excellent adsorption capacity.(2) Diethylenetriamine (DETA) was coated on the surface of Fe3O4nanoparticle by silane coupling agent KH560, then adsorbed Cu2+as template and was crosslinked by crosslinker. The saturation magnetization of this magnetic adsorbent DETA/Fe3O4-MIIP-III was26.65emu/g. The infrared and thermal gravimetric analysis showed that polyethylenimine had been coated on the surface of Fe3O4nanoparticle, and the amount of DETA adsorbed layer was about24%of DETA/Fe3O4-MIIP-III. According the adsorption tests, the maximum adsorption capacity of DETA/Fe3O4-MIIP was38mg/g, which was as1.5times as that of the DETA/Fe3O4-MNIP- III. The relative selectivity coefficient was higher than1, which indicated that DETA/Fe3O4-MIIP-III had an impressed imprinting ability. The adsorption kinetic experiments showed that the adsorption equilibrium of DETA/Fe3O4-MIIP-III achieved after only25minute. After5times reuse, the adsorption capacity of DETA/Fe3O4-MIIP merely decreased. In conclusion, the magnetic sorbent DETA/Fe3O4-MIIP integrated the advantages of magnetic material, and had an excellent adsorption capacity.(3) The relative selectivity coefficient of PEI/Fe3O4-MIIP was higher than DETA/Fe3O4-MIIP, which indicated that the imprinting effect of PEI/Fe3O4-MIIP was better than DETA/Fe3O4-MIIP. The main reason was that the skeleton structure of PEI was more stable than DETA.