Preparation And Application Of Magnetic Molecularly Imprinted Materials

Water pollution is a global menace.Over the past several decades,a wide range of chemical contaminants have been released to the environmental water by various industries,agriculture,and long-term drought.the pollutants inside of toxic heavy metals are not biodegradable and tend to accumulate in living organisms,causing various diseases and disorders.To date,various treatment techniques and processes have been used to remove the metallic ions from the wastewater,including precipitation,evaporation,solvent extraction,ion exchange,reverse osmosis,membrane separation and so on.Most of these methods suffer from some drawbacks such as high capital and operational costs for the treatment and disposal of the residual metal.In recent years,the development of nanotechnology provides a new method of water treatment,especially the emergence of magnetic nano materials,due to its unique properties?high surface area,low cost,good biocompatibility,easy magnetic separation,etc.?have potential applications in many fields.But directly used as adsorption material to deal with the heavy metal ions in the wastewater,poor selectivity,less adsorption,therefore,the surface modification of magnetic nano materials were prepared,large adsorption capacity,renewable ability,selective adsorption and high adsorption material be used for the adsorption of heavy metal ions in wastewater in.?1?By solvothermal method,sol-gel preparation of Cu?II?-MIP magnetic imprinting particles,through SEM,XRD,FT-IR,AAS and other characterization methods of magnetic nano material morphology,crystal structure,functional characteristics and adsorption properties.The study found that the synthesis of magnetic nano material has larger specific surface area,at the same time,with paramagnetic and strong magnetic induction performance,the study found that super good,the optimal experimental conditions:pH value is 7,the initial concentration of 120mg/L,Cu?II?-MIP imprinted material quantity is 0.1g,adsorption time is 6.Next,Cu?II?-MIP magnetic imprinting material on Cu?II?of the saturated adsorption capacity reached 23.29mg/g.Through Langmuir and Freundlich model analysis,it is proved that the adsorption process is mainly single molecular layer adsorption,which shows that the adsorption capacity and the adsorption capacity of the adsorbent are improved;?2?L-ascorbic acid coated Fe₃O₄ magnetic nano materials are synthesized by a variety of modern characterization methods for their analysis,found that the particle size is about 200nm,the specific surface area is 212.754 m²/g,the optimum adsorption conditions were as follows:Cu?II?concentration is 200mg/L,pH 4,adsorbent adding amount is 40mg,adsorption time 2h,the adsorption capacity can reach 44.88mg/g,the adsorption rate was 85%;thermodynamic studies showed that the adsorption process can meet the Frendlich adsorption model is better,more molecules in a spontaneous,endothermic and disordered layer adsorption process,which belongs to the preferential adsorption,the higher the temperature,the adsorption effect is better.