制备聚酰胺-胺树枝状大分子功能化壳聚糖珠用于去除 Ag(I)、Cu(II) 和 Pb(II)。

Preparation of polyamidoamine dendrimer-functionalized chitosan beads for the removal of Ag(I), Cu(II), and Pb(II).

机构信息

School of Metallurgy, Northeastern University, Shenyang 110819, China; Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, China.

出版信息

Int J Biol Macromol. 2023 Jul 1;242(Pt 2):124543. doi: 10.1016/j.ijbiomac.2023.124543. Epub 2023 Apr 18.

DOI:10.1016/j.ijbiomac.2023.124543

PMID:37080404

Abstract

Chitosan bead grafted by third-generation dendrimers (CB-G3) with a diameter of 1.40 mm was synthesized to investigate their performance in recovering Ag(I), Cu(II), and Pb(II) ions in aqueous media. The prepared adsorbents were characterized by XRD, FT-IR, elemental analysis, TGA, and SEM, and the effects of pH, contact time, concentration, and temperature were examined. The results showed that the adsorbents were successfully fabricated. The optimum pH value was 5, and the increased generation number contributed to adsorption capacity improvement, indicating that electrostatic interactions between amine groups and metal ions are the governing mechanism of adsorption by the CB-G3. The kinetics, isotherms, and thermodynamics of Ag(I), Cu(II), and Pb(II) adsorption onto the CB-G3 were investigated. The adsorption processes can be described using pseudo-second-order kinetic and Langmuir models. The maximum monolayer adsorption capacities were 105.62, 88.82, and 97.87 mg·g for Ag(I), Cu(II), and Pb(II) at 30 °C within 210 min, respectively. Electrostatic interactions and hydrogen bonds are the main mechanisms between metal ions and N atoms. Therefore, the CB-G3 is a promising candidate for Ag(I), Cu(II), and Pb(II) adsorption owing to its splendid ability in easy separation, good adsorptivity, and reusability for efficiently adsorbing Ag(I), Cu(II), and Pb(II) ions.

摘要

合成了直径为 1.40mm 的第三代树枝状聚合物接枝壳聚糖珠（CB-G3），以研究其在水介质中回收 Ag(I)、Cu(II)和 Pb(II)离子的性能。通过 XRD、FT-IR、元素分析、TGA 和 SEM 对制备的吸附剂进行了表征，并考察了 pH 值、接触时间、浓度和温度的影响。结果表明，吸附剂成功制备。最佳 pH 值为 5，增加代数值有助于提高吸附容量，表明氨基和金属离子之间的静电相互作用是 CB-G3 吸附的主要机制。研究了 Ag(I)、Cu(II)和 Pb(II)在 CB-G3 上的吸附动力学、等温线和热力学。吸附过程可以用拟二级动力学和 Langmuir 模型来描述。在 30°C 下，210min 内，Ag(I)、Cu(II)和 Pb(II)的最大单层吸附容量分别为 105.62、88.82 和 97.87mg·g。金属离子和 N 原子之间的主要相互作用机制是静电相互作用和氢键。因此，CB-G3 是一种很有前途的 Ag(I)、Cu(II)和 Pb(II)吸附剂，因为它具有出色的分离能力、良好的吸附能力和重复使用性能，能够有效吸附 Ag(I)、Cu(II)和 Pb(II)离子。