Page 190 - 《精细化工》2021年第9期

第 38 卷第 9 期 精 细 化 工 Vol.38, No.9
202 1 年 9 月 FINE CHEMICALS Sept. 2021

水处理技术与环境保护
含氮大分子吸附剂的制备及其对 Cd(Ⅱ)的吸附

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何婷婷，唐炳涛，具本植，马 威，张淑芬
（大连理工大学 化工学院，辽宁 大连 116000）

摘要：利用三聚氯氰的温度梯度反应活性，在较低温度下，用多乙烯多胺与三聚氯氰进行亲核取代反应，合成
出一种以三嗪环为连接点的不溶含氮大分子颗粒吸附剂（N-MGA），并将其用于去除水体中的 Cd(Ⅱ)。通过元
素分析、FTIR 和 SEM 对 N-MGA 进行表征，同时对 Cd(Ⅱ)的吸附进行吸附动力学、等温吸附模型拟合和吸附
机理进行研究，考察了溶液 pH 对 Cd(Ⅱ)吸附性能的影响、吸附剂的吸附-解吸再生循环性能及结构稳定性。结
果表明，该吸附剂对 Cd(Ⅱ)的吸附机理是利用吸附剂氨基上氮的孤对电子与 Cd(Ⅱ)的配位络合作用进行吸附，
且吸附过程符合准二级动力学模型和 Langmuir 吸附等温线模型，最大吸附量可达 539.1 mg/g，且对 Cd(Ⅱ)的吸
附较为容易，吸附能力较强；在 Cd(Ⅱ)初始质量浓度为 3636.5 和 70.0 mg/L 时，对 Cd(Ⅱ)的吸附率分别可达 97.5%
和 99.9%，且 10 次吸附-解吸再生循环中吸附率维持在 97.0%~98.2%，解吸率均在 97.6%以上，吸附剂回收率均
在 92.0%以上。
关键词：含氮大分子；吸附剂；Cd(Ⅱ)；吸附机理；去除率；水处理技术
中图分类号：X703 文献标识码：A 文章编号：1003-5214 (2021) 09-1904-09

Preparation of nitrogen-containing macromolecular adsorbent
and its adsorption for Cd(Ⅱ)

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HE Tingting, TANG Bingtao, JU Benzhi, MA Wei, ZHANG Shufen
（School of Chemical Engineering, Dalian University of Technology, Dalian 116000, Liaoning, China）

Abstract: Water-insoluble nitrogen-containing macromolecular granular adsorbent (N-MGA) was
synthesized at low temperature though nucleophilic substitution between polyethylene polyamine and
cyanuric chloride due to the temperature gradient reaction activity of cyanuric chloride and used to treat
Cd(Ⅱ) in water, herein, the triazine ring of cyanuric chloride served as connection point to combine
polyethylene polyamine and cyanuric chloride. The synthesized particulate adsorbent was characterized by
elemental analysis, FTIR and SEM. At the same time, the adsorption kinetics, isothermal adsorption model
fitting and adsorption mechanism of Cd(Ⅱ) were studied. The effect of pH of solution on the adsorption
performance of Cd(Ⅱ) was investigated. The performance and structural stability of the adsorbent after
adsorption-desorption regeneration were also investigated. The results showed that the adsorption
mechanism of the adsorbent for Cd(Ⅱ) was the coordination complexation between the lone pair electrons
of nitrogen on the amine group on the surface of the adsorbent and Cd(Ⅱ), and the adsorption process was
in line with the pseudo-second-order kinetic model and the Langmuir adsorption model. The maximum
adsorption capacity reached 539.1 mg/g, and the adsorption of Cd(Ⅱ) was relatively easy and strong. When
the initial mass concentrations of Cd(Ⅱ) were 3636.5 and 70.0 mg/L, and the adsorption rates of Cd(Ⅱ)
were 97.5% and 99.9%, respectively. During the 10 adsorption-desorption regeneration cycles, the
adsorption rate was maintained about 97.0%~98.2%, the desorption rate was above 97.6%, and the recovery
rate of the adsorbent was above 92.0%.

收稿日期：2021-05-09; 定用日期：2021-06-18; DOI: 10.13550/j.jxhg.20210469
基金项目：中央高校基本科研专项资金（DUT19TD28）；辽宁振兴人才计划（1801006）
作者简介：何婷婷（1996—），女，硕士生，E-mail：17824831239@163.com。联系人：张淑芬（1960—），女，教授，E-mail：zhangshf@
dlut.edu.cn。