In this paper, new epichlorohydrin crosslinked 2,4-dihydroxybenzaldehyde Schiff base chitosan@SrFe₁₂O₁₉ magnetic nanocomposite (EP-DBSB-CS@SrFe₁₂O₁₉) was prepared from the reaction of epichlorohydrin, 2,4-dihydroxybenzaldehyde and chitosan (1:1:1 weight ratio) at the presence of SrFe₁₂O₁₉ nanoparticles. The title compound EP-DBSB-CS@SrFe₁₂O₁₉ was characterized by FT-IR, XRD, DSC, VSM, FE-SEM, EDS and map analysis and the results of all of them confirm that the successfully preparation of hard magnetic nanocomposite of EP-DBSB-CS@SrFe₁₂O₁₉ with uniform distribution of all elements. In addition, the removal of Pb(II) and Cd(II) ions from aqueous solution using EP-DBSB-CS@SrFe₁₂O₁₉ nanocomposite has been characterized and the effect of pH solution, shaking time and also sorbent dose on removal percentage were investigated. Adsorption results predicts that the maximum removal percentage, 98.5% for Pb(II) and 86% for Cd(II), was found to be at pH solution of 5 at the presence of 0.02 g sorbent and 90 min contact time. According to these results, we proposed adsorption process using magnetic EP-DBSB-CS@SrFe₁₂O₁₉ nanocomposite to removal of other heavy metal such as Hg(II), Cu(II), Co(II), Cr(VI) and Ni(II).

本文以环氧氯丙烷、2,4-二羟基苯甲醛和壳聚糖反应制备了新型环氧氯丙烷交联的2,4-二羟基苯甲醛席夫碱壳聚糖@SrFe ₁₂ O ₁₉磁性纳米复合材料（EP-DBSB-CS@SrFe ₁₂ O ₁₉）（ 1:1:1 重量比）在 SrFe ₁₂ O ₁₉纳米粒子存在下。对标题化合物EP-DBSB-CS@SrFe ₁₂ O ₁₉进行了FT-IR、XRD、DSC、VSM、FE-SEM、EDS和图谱分析，结果均证实了硬磁纳米复合材料的成功制备。 EP-DBSB-CS@SrFe ₁₂ O ₁₉所有元素的均匀分布。_{此外，表征了使用 EP-DBSB-CS@SrFe 12} O ₁₉纳米复合材料从水溶液中去除 Pb(II) 和 Cd(II) 离子，以及 pH 溶液、振荡时间和吸附剂剂量对去除率的影响。进行了调查。吸附结果预测，在存在 0.02 g 吸附剂和 90 分钟接触时间的情况下，发现最大去除百分比（Pb(II) 为 98.5%，Cd(II) 为 86%）是在 pH 值为 5 的溶液中。根据这些结果，我们提出了使用磁性 EP-DBSB-CS@SrFe ₁₂ O ₁₉纳米复合材料的吸附工艺来去除其他重金属如 Hg(II)、Cu(II)、Co(II)、Cr(VI) 和镍(II)。