A novel grafting polymer was synthesized via grafting of diphenylamine (DPA) onto sodium alginate (NaAlg) as a new adsorbent for Cobalt (Co²⁺) from aqueous solutions. Optimization of sodium alginate grafted by diphenylamine (NaAlg-g-DPA) was addressed in the current study by several parameters including; initiator and monomer concentrations, contact time of polymerization, as well as polymerization temperature. In addition, the structural and chemical characteristics of NaAlg-g-DPA were explored using different modalities later. The results showed that sodium alginate grafted by diphenylamine (NaAlg-g-DPA) is suitable for adsorbent to removal Co²⁺ ion. The parameters for the adsorption of Co(II) ions by NaAlg-g-DPA were also determined. It was shown that the samples of NaAlg-g-DPA had given good correlation with Temkin's isotherm model and their kinetics followed pseudo-second-order model. It was also observed that the adsorption capacity seemed to be dependent on pH value in solution which showed better results at basic pH. The findings from this research show that NaAlg-g-DPA has capability to remove Co (II) from aqueous solutions.

通过将二苯胺（DPA）接枝到海藻酸钠（NaAlg）上作为水溶液中钴（Co ²⁺）的新吸附剂，合成了一种新型的接枝聚合物。本研究通过以下几个参数解决了由二苯胺（NaAlg-g-DPA）接枝的海藻酸钠的优化问题：引发剂和单体的浓度，聚合的接触时间以及聚合温度。此外，后来使用不同的方法探索了NaAlg-g-DPA的结构和化学特性。结果表明，二苯胺接枝的海藻酸钠（NaAlg-g-DPA）适合吸附剂去除Co ^2+。离子。还确定了NaAlg-g-DPA吸附Co（II）离子的参数。结果表明，NaAlg-g-DPA样品与Temkin的等温线模型具有良好的相关性，其动力学遵循伪二级模型。还观察到，吸附能力似乎取决于溶液中的pH值，在碱性pH下显示出更好的结果。这项研究的结果表明，NaAlg-g-DPA具有从水溶液中去除Co（II）的能力。