The Preparation Of Amino Functional Magnetic Material And Its Adsorption Of Heavy Metal Ions In Water

This paper aims at preparing a kind of low processing cost, high adsorption capacity, renewable and environmentally friendly adsorption material, used in adsorption of heavy metal ions in wastewater. This paper mainly centers on preparation of functionalized magnetic nanoparticles via the hydrothermal method and StOber method and their application as adsorbent for heavy metals from aqueous solution. The details are described as follows:(1) Amino functionalized magnetite nanoparticles(Fe3O4-NH2) were synthetized by a simple one-pot solvothermal method, using FeCl3·6H2O as iron source,1,6-hexanediamine offers amino functional groups. The amount of FeCl3·6H2O and1,6-hexanediamine, reaction time influencing on the reaction were explored through XRD, TEM, SEM, FTIR, VSM, TG, optimizing the preparation condition. The possible synthetic mechanism of Fe3O4-NH2was also analyzed.(2) Amino-functionalized mesoporous magnetic adsorbents(Fe3O4@mSi-NH2) were synthetized by StOber method, with magnetic Fe3O4core, intermediate non-porous silica, the structure directing agents cetyltrimethylammonium bromide (CTAB) creats masopores silica,(3-aminopropyl)trimethoxysilane(APTMS) offers amino functional groups for heavy mental ions removal. The amount of ethyl orthosilicate(TEOS) and ammonia solution, the ratio of alcohol/water, stirring style influencing on silica thickness and dispersion were explored. Different methods to remove CTAB template were used, aimed at obtaining a simple operation, shorter time, good removal method. The possible formation mechanism of Fe3O4@mSi-NH2was also analyzed.(3) The adsorption and desorption behavior of Pb2+and Cu2+in aqueous solution on Fe3O4@nSiO2@mSiO2-NH2and Fe3O4-NH2were investigated by batch experiments. Adsorption time, solution pH, initial concentration, adsorption kinetics and adsorption isotherms were mainly discussed. At the same time, the recycle adsorption efficiency of metal-loaded adsorption material ultrasonic treated with acid solution were studied. Findings of the present work highlight the potential for using amino functionalized magnetite nanoparticles as an effective and recyclable adsorbent for the removal of heavy metal ions in wastewater treatment.