Study on the Adsorption Mechanism of Cobalt and Nickel in Manganese Sulfate by δ-MnO.

Manganese has excellent performance in removing metal ions from aqueous solutions, but there are few studies on the adsorption and removal of heavy metal impurities in metal salt solutions. In this paper, the adsorption of cobalt and nickel ions in MnSO solution by δ-MnO prepared from two different manganese sources was studied. The optimum adsorption conditions were as follows: When the concentration of Mn was 20 g/L, δ-MnO addition was 10 g/L, Co concentration was 80 mg/L, Ni concentration was 80 mg/L, reaction time was 60 min, reaction temperature was 80 °C, and pH value was 7, the adsorption rate of Co and Ni reached more than 80%. The manganese dioxide adsorbed by heavy metals was analyzed and detected. The results showed that MnOOH appeared in the phases of both kinds of δ-MnO, and their morphologies were dense rod-like structures with different lengths and flake-like structures of fine particles. Co and Ni were distributed on the surface and gap of MnO particles, and the atomic percentage of Co was slightly higher than that of Ni. The new vibration peaks appeared near wave numbers of 2668.32, 1401.00, and 2052.19 cm, which were caused by the complexation of cations such as Co and Ni with hydroxyl groups. Some cobalt and nickel appeared on the surface of δ-MnO, and the surface oxygen increased after adsorption. The above characterization revealed that the adsorption of cobalt and nickel in manganese sulfate by δ-MnO was realized by the reaction of its surface hydroxyl with metal ions (M) to form ≡SOMOH.