Starch-g-polyacrylamide copolymer and its nanocomposite with Fe₃O₄ and graphene oxide have been successfully synthesized. The synthesized samples were characterized using FTIR, XRD, SEM, HRTEM, and VSM. The factors that affect the adsorption efficiency of samples for Ni(II) ions from aqueous solutions as pH, initial Ni(II) ions concentration, contact time and temperature have been examined. The maximum adsorption capacities achieved by the synthesized samples were 195 mg g⁻¹ and 290 mg g⁻¹ for starch-g-polyacrylamide copolymer and its starch-g-polyacrylamide/ Fe₃O₄/ graphene oxide nanocomposite respectively. Kinetic studies showed that the adsorption was well described by the pseudo–second-order model and the equilibrium adsorption data fitted Freundlich model. Thermodynamic studies showed that the adsorption capacity increases as temperature increase up to 313 K but higher temperatures result in dissolution of starch. Results showed that the adsorption process is spontaneous, endothermic in nature and leads to a greater entropy.

已成功合成了淀粉-g-聚丙烯酰胺共聚物及其与Fe ₃ O ₄和氧化石墨烯的纳米复合材料。使用FTIR，XRD，SEM，HRTEM和VSM对合成的样品进行表征。考察了影响样品对水溶液中Ni（II）离子的吸附效率的因素，例如pH，初始Ni（II）离子浓度，接触时间和温度。合成样品对淀粉-g-聚丙烯酰胺共聚物及其淀粉-g-聚丙烯酰胺/ Fe ₃ O ₄的最大吸附容量为195 mg g ^-1和290 mg g ^-1。/氧化石墨烯纳米复合物。动力学研究表明，假二阶模型很好地描述了吸附，平衡吸附数据符合Freundlich模型。热力学研究表明，当温度升高至313 K时，吸附能力会增加，但较高的温度会导致淀粉溶解。结果表明，吸附过程是自然的，吸热的，并导致更大的熵。