Immobilization of 4-amino-2-hydroxyacetophenone onto silica gel surface and sorption studies of Cu(II), Ni(II), and Co(II) ions

摘要

The 4-amino-2-hydroxyacetophenone was immobilized onto silica gel modified withud3-aminopropyltrimethoxy silane. The carried reaction is classic condensation reaction. Theudobtained structure was characterized by infrared spectroscopy and thermo gravimetric analysis.udThe values of adsorption of Cu(II), Ni(II), and Co(II) ions were detected with an atomicudabsorption spectrometer. The experiment conditions for effective sorption of the studiedudmetal ions were performed by using batch method. The maximum adsorption capacitiesudand isotherm parameters were calculated with using the Langmuir, Freundlich, andudDubinin-Radushkevich isotherm equations. Thermodynamic parameters such as free energyud(ΔG°), entropy (ΔS°), and enthalpy (ΔH°) were also calculated from the experimental results.udThe sorption results were used to explain the mechanism of the sorption. The modifiedudstructure was successfully used in the separation of Cu(II), Ni(II), and Co(II) from theudaqueous solutions.