Composite Materials Based on Orange and Pomegranate Peels for Сu (II) and Zn (II) Ions Extraction

The method of obtaining composite materials based on orange (OP) and pomegranate (PP) peels is described. The fruit peels were modified by polyethylene glycol (PEG). Sorption ability of obtained composite materials towards heavy metal ions (Zn and Cu) was studied. The effect of the mass of composite materials and PEG concentration were studied. The optimal concentration of PEG was determined as 0.1%. The maximum removal degree of heavy metals was at 2 and 2.5 g per 100 ml of solution for orange and pomegranate peels respectively. Three different adsorption models were used to describe the sorption process (Langmuir, Freundlich, and BET). The most applicable for the sorption of Zn (II) and Cu (II) ions by both OP and PP is Freundlich theory. Hence, the sorption of Zn (II) and Cu (II) ions by modified peels of orange and pomegranate occurs at a heterogeneous system where the active centers are unevenly filled.