Adsorption Of Malachite Green And Copper Ions By Magnetic Nanorod Composites

With the rapid development of industry,a series of prominent environmental pollution problems,especially,the pollution of heavy metal ions and organic dye existing in water environment,have emerged.Copper,as one of the transition metals closely associated with the survival of human beings,has detrimental risk to both human health and ecological systems.Therefore,to explore some new materials,high-efficiency and quickly methods to remove heavy metal copper ions from the water.In this paper,a series of composite materials were prepared on the basis of magnetic nanorods for the adsorption of heavy metal copper ions and organic pollutants malachite green.The isothermal adsorption model and kinetic model were investigated.The main contents are as follows:1.The magnetic nanorods were prepared by hydrothermal method.The morphology of the prepared magnetic nanorods was regular and size of the magnetic nanorods was about200-300 nm.After further compounding with magnesium silicide,the flower materials were characterized by XRD,FTIR,EDS,SEM and TEM for crystal structure and morphological characteristics of the composites.MgSi@Fe₃O₄ had better adsorption properties to Cu???and MG.The adsorption properties of MgSi@Fe₃O₄ were investigated by studying the adsorption parameters such as pH,the amount of adsorbent,the initial concentration and the contact time.The maximum adsorption capacities of MgSi@Fe₃O₄ composites for Cu???and MG were 2198 and 112.8 mg/g,respectively.The Langmuir and Freundlich models were consistented with the experimental data,and the quasi-second order kinetic equation had good correlation.In addition,MgSi@Fe₃O₄was easy to separate and recyclable.These unique properties made MgSi@Fe₃O₄composites a better development prospect in wastewater treatment2.Based on the traditional coprecipitation method,the magnetic nanorods were synthesized by microwave-assisted synthesis.The thiol-functional magnetic nanorods adsorbents were prepared by grafting the thiol groups on the surface of Fe₃O₄.The results showed that the prepared thiol-functional magnetic nanorods had a large adsorptive capacity for Cu???,and the isothermal adsorption model and kinetic model were studied.The thiol-functional magnetic nanorods can be quickly separated by additional magnetic field,and had a high cycle performance.The thiol-functionalized magnetic nanorods had potential application value in wastewater treatment.3.Amino-functional magnetic nanorods were successfully synthesized,and Cu???adsorption performance were studied for discussing its optimum adsorption conditions,found that the synthesis of amino-functional magnetic nanorods of Cu???had a larger adsorption capacity.Amino-functional magnetic nanorods were in good agreement with the Langmuir and Freundlich adsorption models.The kinetic model had a good correlation with the quasi-second order kinetic model.In addition,the amino-functional magnetic nanorods had good cycle performance.The characteristics of effective and rapid removal of Cu???made amino-functional magnetic nanorods had good application prospect in wastewater treatment.