中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 32 No. 9 September 2022 |
（1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), School of Metallurgy, Northeastern University, Shenyang 110819, China;
2. Liaoning Key Laboratory for Metallurgical Sensor and Technology, Northeastern University, Shenyang 110819, China;
3. School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China）
Abstract:Spherical flower-like Mg(OH)2 was fabricated from MgSO4 effluent and its adsorption performance for heavy metal ions was evaluated. The appropriate fabrication conditions are as follows: Mg2+/NH4OH molar ratio of 1:0.5, temperature of 120 °C and time of 1 h at Mg2+ concentration of 2 mol/L. Spherical flower-like Mg(OH)2 composed of ultra-thin sheets exhibits an excellent adsorption ability for Ni2+, Cu2+, Zn2+, Pb2+, Fe3+ and Co2+, and the adsorption reaches the equilibrium in 6 min. The maximum adsorption capacities of the studied heavy metal ions onto Mg(OH)2 at 20 °C are 58.55, 85.84, 44.94, 485.44, 625.00 and 27.86 mg/g, respectively. The adsorption is well fitted by the Langmuir model, indicating that the adsorption is monolayer. The adsorption kinetics follows the pseudo-second- order model. Chemisorption is the operative mechanism. Spherical flower-like Mg(OH)2 is a qualified candidate for heavy metal ions removal.
Key words: MgSO4 effluent; flower-like Mg(OH)2; heavy metal ion; adsorption
