Page 179 - 《精细化工》2021年第1期

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

水处理技术与环境保护
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聚乙烯亚胺改性磁性膨润土对 Pb 和
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Cu 的吸附性能

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孙志勇 ，王智懿 ，张 娇 ，马向荣
（1. 榆林学院 能源工程学院，陕西 榆林 719000；2. 榆林学院 化学与化工学院，陕西 榆林 719000）
摘要：在磁性膨润土（MBent）表面接枝聚乙烯亚胺（PEI）制备了聚乙烯亚胺改性磁性膨润土（PEI/KH560/MBent），
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采用 FTIR、VSM、XRD、TGA、EA、SEM 和 EDS 对其进行了表征，考察了其对水溶液中 Pb 和 Cu 的吸附
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性能。结果表明，聚乙烯亚胺已成功接枝于磁性膨润土表面，并有效提高了其对 Pb 和 Cu 的吸附量；溶液初
始 pH 对吸附量影响较大，随着 pH 的增大，吸附量增加。在 pH=5，溶液初始质量浓度为 300 mg/L，
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PEI/KH560/MBent 对 Pb 和 Cu 吸附量分别为 96.21 和 61.08 mg/g；吸附过程符合准二级动力学模型，吸附行
为符合 Langmuir 吸附等温模型。热力学研究表明，吸附为自发吸热过程。经过 5 次循环利用后，其吸附容量仍
保持初始的 60%以上，表明 PEI/KH560/MBent 具有一定的重复利用性。
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关键词：聚乙烯亚胺；膨润土；Pb ；Cu ；吸附；功能材料；水处理技术
中图分类号：X703；TQ424 文献标识码：A 文章编号：1003-5214 (2021) 01-0169-08
Adsorption properties of polyethyleneimine modified
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magnetic bentonite for Pb and Cu
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SUN Zhiyong , WANG Zhiyi , ZHANG Jiao , MA Xiangrong
（1. School of Energy Engineering, Yulin College, Yulin 719000, Shaanxi, China; 2. School of Chemistry and Chemical
Engineering, Yulin College, Yulin 719000, Shaanxi, China）
Abstract: Polyethyleneimine modified magnetic bentonite (PEI/KH560/MBent) was prepared by grafting
polyethyleneimine (PEI) on the surface of magnetic bentonite (MBent) and characterized by FTIR, VSM,
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XRD, TGA, EA, SEM and EDS. The adsorption performance of PEI/KH560/MBent for Pb and Cu in
aqueous solution was studied. The results showed that polyethyleneimine was successfully grafted onto the
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surface of magnetic bentonite and effectively increased the adsorption capacity for Pb and Cu . The
initial pH of solution had a great influence on the adsorption capacity. When the pH increased, the
adsorption capacity increased. Under the conditions of pH=5 and the initial concentration of the solution of
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300 mg/L, the adsorption capacities of PEI/KH560/MBent for Pb and Cu were 96.21 and 61.08 mg/g,
respectively. The adsorption process was in line with the quasi-second-order kinetic model, and the
adsorption behavior was consistent with the Langmuir adsorption isotherm model. The results of
thermodynamic studies indicated that the adsorption was a spontaneous endothermic process. After 5 cycles
of recycling, the adsorption capacity remained above 60% of the original, indicating that PEI/KH560/
MBent had certain reusability.
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Key words: polyethyleneimine; bentonite; Pb ; Cu ; adsorption; functional materials; water treatment
technology

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重金属是有毒的、不可生物降解的，并且具有 生物积累性 ，水体重金属污染是一个严重的公共

收稿日期：2020-07-02; 定用日期：2020-09-23; DOI: 10.13550/j.jxhg.20200581
基金项目：国家自然科学基金（52064048）；陕西省科技厅项目（2019SF-271）；陕西省科技资源开发共享平台项目（2019PT-18）
作者简介：孙志勇（1981—），男，副教授，E-mail：sunzy11@126.com。