Use of a newly synthesized Si-CPTS-AHAP adsorbent in the removal of Cr(vi) ions in wastewater treatment systems may potentially lead to low cost and highly efficient heavy metal removal.

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The 4-amino-2-hydroxyacetophenone was immobilized onto silica gel modified with\ud 3-aminopropyltrimethoxy silane. The carried reaction is classic condensation reaction. The\ud obtained structure was characterized by infrared spectroscopy and thermo gravimetric analysis.\ud The values of adsorption of Cu(II), Ni(II), and Co(II) ions were detected with an atomic\ud absorption spectrometer. The experiment conditions for effective sorption of the studied\ud metal ions were performed by using batch method. The maximum adsorption capacities\ud and isotherm parameters were calculated with using the Langmuir, Freundlich, and\ud Dubinin-Radushkevich isotherm equations. Thermodynamic parameters such as free energy\ud (ΔG°), entropy (ΔS°), and enthalpy (ΔH°) were also calculated from the experimental results.\ud The sorption results were used to explain the mechanism of the sorption. The modified\ud structure was successfully used in the separation of Cu(II), Ni(II), and Co(II) from the\ud aqueous solutions