Insight into adsorption behavior of activated ZrO2 prepared by solution combustion for the removal of chromium and barium ions from aqueous solutions

The prepared activated zirconium oxide was characterized using different analytic techniques and investigated as a new inorganic sorbent to get rid of the chromium and barium ions from the waste stream. Several experiments have been performed, including the impact of contact time, pH, initial ion concentration, temperature, desorption, and the effect of interfering ions. Different isotherm kinetic models were investigated. The outcomes demonstrated that, the second-order kinetic model was appropriate, and the monolayer capacities for the chromium and barium ions were 35.9 and 33.9 mg/g, respectively. Finally, zirconium oxide was recommended to be used as a highly selective adsorbent for hazardous metal ions.