Magnetic Solid Phase Extraction Method Based On Hydrothermal Carbon Based Materials And Its Application In Environmental Pollutant Analysis

In recent years,environmental ecosystem safety have become a hot research field.Heavy metal elements are widely present in natural water bodies and drinking water,directly affecting the ecological environment and people’s health.Bisphenol compounds are widely used as raw materials for chemical production,and they are also a kind of environmental endocrine disruptors,Bisphenols are becoming more and more harmful to the endocrine system,health and reproductive system of humans and animals.The determination of a variety of trace metal ions and bisphenols in water has always been a key issue in the field of environmental analysis.The purpose of this thesis is to synthesize magnetic hydrothermal carbon materials as magnetic solid phase extraction(MSPE)materials,to enrich pollutants in water,and to establish a new method for the determination of trace pollutants by ICP-MS or UPLC-MS/MS.The specific work is divided into the following parts:(1)Magnetic caramelized carbon nanomaterials(γ-Fe2O3@CCM)with shell core structure were synthesized And the MSPE method was established based on it.Taking the existing form of metal arsenic(As)in water as the adsorption target,the effects of adsorbent dosage,pH of the solution and adsorption time on the adsorption rate of As ion were investigated.The adsorption capacity,adsorption mechanism and regeneration performance of the material were evaluated.The adsorption kinetics of As ion and adsorption cycle test on materials γ-Fe2O3@CCM were studied.A simple and sensitive method for the enrichment and determination of trace As and Se by ICP-MS with MSPE was established based on γ-Fe2O3@CCM.(2)Magnetic β-cyclodextrin nanoparticles(γ-Fe2O3@p-β-CD)with shell core structure were synthesized.The MSPE method was established based onγ-Fe2O3@p-β-CD.The conditions of adsorption,desorption and UPLC-MS/MS analysis in MSPE were optimized.A MSPE-UPLC-MS/MS method was developed for the determination of trace bisphenol in water.The method established in this paper can be used for simultaneous quantitative analysis of five kinds of bisphenol pollutants,with the advantages of less adsorbent consumption and low detection limit.