Magnetized activated carbons (MAC) were prepared by activating rape straw powder, and pyrolyzing at different temperatures, then magnetizing activated carbon by hydrothermal method. MAC-300 had the largest adsorption capacity of Pb(II) (253.2 mg/g) and Cd(II) (73.3 mg/g). The adsorption isotherms and kinetics could conform to the Freundlich model and pseudo-second-order kinetic model, respectively, indicating that the adsorptive behavior of the adsorbent mainly depends on the non-uniform active points on the surface of the material. Meanwhile, the thermodynamic parameters showed that the adsorption of Pb(II) and Cd(II) by MAC-300 was a spontaneous and endothermic reaction. The adsorption capacity of MAC-300 could be improved by properly increasing the pH of the original solution. There was competitive adsorption when high-valent ions were present in solution. In combination with various characterizations and comparison tests of samples after adsorption, the adsorption mechanisms include surface electrostatic attraction, surface complexation, and co-precipitation. The results indicated that the MAC material was a potential material to remove heavy metal ions from the aqueous solution.

通过活化油菜秸秆粉末并在不同温度下热解，然后通过水热法将活性炭磁化来制备磁化活性炭（MAC）。MAC-300具有最大的Pb（II）（253.2 mg / g）和Cd（II）（73.3 mg / g）吸附容量。吸附等温线和动力学可以分别符合Freundlich模型和伪二级动力学模型，这表明吸附剂的吸附行为主要取决于材料表面的不均匀活性点。同时，热力学参数表明，MAC-300对Pb（II）和Cd（II）的吸附是自发吸热反应。通过适当增加原始溶液的pH值可以提高MAC-300的吸附能力。当溶液中存在高价离子时，存在竞争性吸附。结合各种特性和吸附后样品的对比测试，吸附机理包括表面静电吸引，表面络合和共沉淀。结果表明，MAC材料是从水溶液中去除重金属离子的潜在材料。