The research on adsorption efficiency of toxic nickel ion using synthetic α-MnO2. (December 2015) - Li, S.
Abstract : We discuss the adsorption efficiency of α-MnO2 for Ni 2+ in water under various conditions. The adsorption kinetics of α-MnO2 fitted the pseudo-second-order model better than the pseudo-first-order model. The adsorption efficiency increased rapidly at 0–30 minutes, although after 90 minutes, the rate of adsorption efficiency was almost 0. The pH affected the adsorption efficiency significantly. From pH 2 to 4, the adsorption efficiency increased sharply as the pH increased. At pH≥4, the adsorption efficiency was high, and at pH 8, it reached a maximum of 63%. Increasing the temperature also increased the adsorption efficiency, suggesting that the adsorption reaction is endothermic. For reaction systems containing more than 10 mmol α-MnO2, the adsorption efficiency for Ni 2+ was nearly 100%.