Page 166 - 《精细化工》2020年第3期

第 37 卷第 3 期 精 细 化 工 Vol.37, No.3
202 0 年 3 月 FINE CHEMICALS Mar. 2020

水处理技术与环境保护
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PAMAM 接枝稻草对 Nd 、Sm 、La 的吸附特性
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章昌华 ，郭 明 ，涂伟萍 ，许立信
（1. 安徽工业大学 化学与化工学院，安徽 马鞍山 243002；2. 华南理工大学 化学与化工学院，广东 广
州 510640；3. 安徽工大化工科技有限公司，安徽 马鞍山 238251）
摘要：以环氧氯丙烷为交联剂，将聚酰胺胺树状大分子（PAMAM）接枝到稻草基体上，利用 FTIR、SEM、XRD、
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TG 等对其结构进行了表征和分析。考察了其对 Nd 、Sm 、La 稀土金属离子的吸附性能，探讨了吸附时间、
稀土金属离子浓度、吸附温度、溶液 pH 等因素对吸附性能的影响。同时对吸附过程的动力学、吸附等温线和
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吸附热力学进行了研究。结果表明，所制备的吸附剂对 Nd 、Sm 、La 稀土金属离子的吸附平衡时间约为 4 h，
平衡吸附量分别为 47.14、40.11 和 50.12 mg/g。吸附过程符合拟二级动力学模型和 Freundlich 等温线，表明此吸
附过程是属于化学吸附过程。吸附热力学研究表明，此吸附过程是自发进行的，同时吸附过程是一个混乱度增
加的熵增过程。
关键词：聚酰胺胺树状大分子；稀土金属离子；吸附；动力学；水处理技术
中图分类号：X52；O647.3 文献标识码：A 文章编号：1003-5214 (2020) 03-0584-07

Adsorption characteristics of PAMAM grafted rice
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straw for Nd , Sm and La
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ZHANG Changhua , GUO Ming , TU Weiping , XU Lixin
（1. School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, Anhui, China;
2. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640,
Guangdong, China; 3. Anhui University of Technology Chemical Science & Technology Co., Ltd., Maanshan 238251,
Anhui, China）
Abstract: A novel absorbent, polyamidoamine (PAMAM) dendrimer grafted rice straw was prepared using
epichlorohydrin as crosslinking agent. Its structure was characterized and analyzed by FTIR, SEM, XRD
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and TG. The adsorption properties of the functionalized rice straw for Nd , Sm and La from aqueous
solution were researched. The effects of adsorption time, initial rare earth metal ions concentration,
adsorption temperature, pH and other factors on the adsorption properties of these rare earth metal ions
were investigated. At the same time, the kinetics behavior, adsorption isotherm, and thermodynamics
parameters of the adsorption process were studied. The adsorption mechanism of this adsorption process
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was discussed. The results showed that the adsorption equilibrium time of the prepared absorbent for Nd ,
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Sm and La was all about 4 h. And the corresponding adsorption capacities were 47.14, 40.11 and
50.12 mg/g, respectively. The adsorption process conformed to the pseudo-second-order kinetics model and
the Freundlich isotherm model was more appropriate for tracing the adsorption behavior, indicating that the
adsorption process was a chemical adsorption process. In additional, the thermodynamics studies showed
that the adsorption was a spontaneous and entropy increasing process.
Key words: PAMAM; rare earth metal ions; adsorption; kinetics; water treatment technology

稀土金属具有独特的光、电、磁性能，在电子 由于世界经济的快速发展，全球对稀土金属的需求
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工业、新材料和新能源等行业有着广泛的应用 ， 也持续增长 。稀土金属的大量开采、加工和应用，

收稿日期：2019-06-05; 定用日期：2019-09-09; DOI: 10.13550/j.jxhg.20190507
基金项目：安徽省教育厅重点项目（KJ2017A047）
作者简介：章昌华（1979—），男，博士，副教授，E-mail：zhangchanghua163@126.com。