Optimization of Process Parameters for Retention of Cd(II) Ions Adsorption from Aqueous Solutions on Clay Materials

Globally, heavy metal pollution is classified as serious environmental problem. Cd(II) ions are commonly encountered pollutants that are toxic to human life, even at low concentration and adsorption is one of the most suited process for this heavy metal ions removal from aqueous solutions. Clay materials have risen as potential options in contrast to conventional adsorbents. The adsorption properties of clay in retention of Cd(II) from aqueous solutions have been studied in batch technique. The amount of adsorbed heavy metal ions was determined for the adsorption systems as a function of adsorbent dose, initial solution pH, initial ion concentration, contact time and temperature. Based on the obtained experimental results, the optimal values of the process parameters are: initial solution pH 7.0, 4.0 g·L-1 adsorbent, 60 minutes of contact time and ambient temperature. These conditions ensure a maximum removal efficiency of Cd(II) ions of 93%