The Synthesis Of Modified Magnetic Nanoparticles And Their Application For The Extraction Of Environmental Hormones

The environment hormones have the potential to cause cancer, cellular degradation, birth defects, and interruption of hormone functions. They are harmful to both environment and human health, and the source of environment hormones spread widely in industry, agriculture, wastewater and so on. Because of the situation described above, it is crucial to develop a sensitive, rapid, simple, reliable and inexpensive high-throughput method for the preconcentration and determination of environment hormones.In this work, the synthesis of N-methylimidazolium ILs-modified magnetic material by self-assembly was conducted. This ILs upon immobilization on magnetic nanoparticle has been used as a sorbent for the dispersive soild phase extraction of pyrethroid residues in tea. The prepared material was characterized. Parameters that can affect the extraction efficiency of the analytes were studied in detail. The results indicate that this method is an efficient extraction procedure for the analysis of pyrethroid residues in tea samples.A new type of immobilized PILs was developed using a microwave-assisted method to form magnetic nanoparticles (denoted Fe3O4@SiO2@PILs). Various characterization techniques confirmed the synthesis of the magnetic nanomaterial. Because of the unique advantages of combining PILs and magnetic nanoparticles, the modified magnetic nanoparticles have potential applications in dispersive solid-phase extraction (dSPE). The influence of various experimental parameters on extraction efficiency is investigated. A notable finding is that Fe3O4@SiO2@PILs can be reused for multiple extractions. Extraction parameters were optimized by high-performance liquid chromatography (HPLC) analysis for the determination of pesticides in vegetables and fruits samples.The synthesis of Graphene Oxides (GO)-modified magnetic nanoparticle was conducted by conventional heating and by microwave irradiation respectively. Various characterization techniques confirmed the synthesis of the magnetic nanomaterial. This GO upon immobilization on magnetic nanoparticle served as a sorbent for the dSPE of PCs from water. Parameters that can affect the extraction efficiency of the analytes were investigated in detail. A notable finding was that the Fe3O4@SiO2@GO MNPs can be recycled for multiple extractions. The results indicate that this method is an efficient extraction procedure for the analysis of PCs in water.Compared with the conventional methods, the proposed methods in this article are more environmentally friendly, simpler, faster and more efficient. They give excellent performances in the extractions of environmental samples.