Adsorption studies
The adsorption of iron on pomegranate peel carbon adsorbent was studied by batch method. A known volume of Fe(II) solutions with different initial concentrations was taken in a 50-mL conical flask and agitated in a mechanical shaker at 120 rpm with a known dose of adsorbent for a specified contact time. After equilibration, samples were filtered using Whatman 42 filter paper (Maidstone, Kent, UK), and the concentration of iron was determined according to spectrophotometric stand- ard method [24]. The data obtained in the batch mode was used to calculate the equilibrium metal adsorptive quantity using the following expression: