School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.
Int J Biol Macromol. 2021 Feb 28;171:17-27. doi: 10.1016/j.ijbiomac.2020.12.184. Epub 2021 Jan 5.
Herein, an effective adsorbent, 3D porous tubular network-structured citric acid-chitosan/Fe/polyethyleneimine beads (CCFPB) with multifunctional active groups and strong selectivity, was prepared for the selective removal of Cu from simulated wastewater. Compared with pure chitosan beads (CB), the adsorption capacity of CCFPB for Cu was increased by 127 mg g (238%), and the adsorption equilibrium time was shortened by 480 min. The CCFPB showed porous surface and a novel 3D porous tubular network structure in interior, which were benefit to the diffusion of Cu from surface to interior of the CCFPB and the shortening of adsorption equilibrium time. The common coexisting ions in the simulated wastewater had almost no effect on the adsorption of Cu by CCFPB, and the adsorption was fast and reached equilibrium within 10 h. The adsorption process followed pseudo-second-order kinetics and the Langmuir isotherm model (q = 240.9 mg g for Cu). The adsorption mechanism of CCFPB for Cu was mainly the synergistic interaction with amino, carboxyl, and hydroxyl groups. This strategy shows great potential for developing a variety of novel, highly active, and reusable immobilized functional beads materials for effective separation of Cu from multi-ion wastewater.
在此，制备了一种具有多功能活性基团和强选择性的有效吸附剂，即 3D 多孔管状网络结构的柠檬酸-壳聚糖/Fe/聚乙烯亚胺珠（CCFPB），用于从模拟废水中选择性去除 Cu。与纯壳聚糖珠（CB）相比，CCFPB 对 Cu 的吸附容量增加了 127mg/g（238%），吸附平衡时间缩短了 480min。CCFPB 具有多孔表面和新颖的 3D 多孔管状网络结构，有利于 Cu 从表面扩散到 CCFPB 的内部，并缩短了吸附平衡时间。模拟废水中常见的共存离子对 CCFPB 吸附 Cu 几乎没有影响，吸附在 10h 内快速达到平衡。吸附过程符合拟二级动力学和 Langmuir 等温模型（q 对 Cu 为 240.9mg/g）。CCFPB 对 Cu 的吸附机制主要是氨基、羧基和羟基的协同相互作用。该策略为开发各种新型、高活性、可重复使用的固定化功能珠材料，用于从多离子废水中有效分离 Cu 提供了巨大潜力。
