Polyelectrolyte composite nanospheres are relatively new adsorbents which have attracted much attention for their efficient pollutant removal and reuse performance. A novel polyelectrolyte nanosphere with magnetic function (SA@AM) was synthesized via the electrostatic reaction between the polyanionic sodium alginate (SA) and the surface of a prepared terminal amino-based magnetic nanoparticles (AMs). SA@AM showed a size of 15–22 nm with 6.85 emu·g⁻¹ of magnetization value, exhibiting a high adsorption capacity on Pb(II) ions representing a common heavy metal pollutant, with a maximum adsorption capacity of 105.8 mg g⁻¹. The Langmuir isotherm adsorption fits the adsorption curve, indicating uniform adsorption of Pb(II) on the SA@AM surfaces. Repeated adsorption desorption experiments showed that the removal ratio of Pb(II) by SA@AM was more than 76%, illustrating improved regeneration performance. These results provide useful information for the production of bio-based green magnetic nano scale adsorption materials for environmental remediation applications.

聚电解质复合纳米球是相对较新的吸附剂，因其有效的污染物去除和再利用性能而备受关注。通过聚阴离子海藻酸钠（SA）与制备的末端氨基氨基磁性纳米粒子（AM）表面之间的静电反应，合成了具有磁性功能的新型聚电解质纳米球（SA @ AM）。SA @ AM显示尺寸为15-22纳米，6.85鸸鹋·克^-1磁化值的，表现出对Pb高吸附容量（II）表示共同的重金属污染物离子，用105.8毫克g的最大吸附容量^{- 1个}。Langmuir等温线吸附符合吸附曲线，表明Pb（II）在SA @ AM表面均匀吸附。重复的吸附解吸实验表明，SA @ AM对Pb（II）的去除率超过76％，说明再生性能得到改善。这些结果为生产用于环境修复应用的生物基绿色磁性纳米级吸附材料提供了有用的信息。