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第 36 卷第 6 期 精 细 化 工 Vol.36, No.6
201 9 年 6 月 FINE CHEMICALS June 2019

水处理技术与环境保护
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果胶-PDA 微球的功能化制备及其对 Th 的吸附性能

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张永德 1,2 ，张思月 2,3 ，易发成 ，乔 丹 2,3 ，贾岷明
（1. 西南科技大学 核废物与环境安全国防重点学科实验室，四川 绵阳 621010；2. 西南科技大学 生物
质材料教育部工程研究中心，四川 绵阳 621010；3. 西南科技大学 材料科学与工程学院，四川 绵阳
621010）

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摘要：以果胶为原料，利用溶胶-凝胶法，Ca 为交联剂制备出果胶-Ca 微球，使用多巴胺修饰果胶-Ca 微球生成
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功能化的吸附剂果胶-聚多巴胺（PDA）微球。探讨了该吸附剂去除 Th 的吸附性能，并利用 SEM、FTIR 和 XPS
分析了其功能化制备和吸附的机理。结果表明，果胶-PDA 微球在 pH=3.5 时吸附效果最好，在 25 ℃、pH=3.5、
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初始 Th 质量浓度为 24 mg/L、吸附剂质量为 0.03 g 的条件下，接触时间为 1200 min 时，吸附容量可达到
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37.172 mg/g；共存离子 Cs 、Sr 、Mn 和 Mg 对 Th 的吸附影响较小，说明该吸附剂对 Th 的吸附选择性较
好；热力学和动力学研究结果表明，吸附过程符合线性 Langmuir 等温吸附模型和准二级动力学模型，最大吸附
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量为 99.010 mg/g；热力学数据表明，果胶-PDA 吸附 Th 是一个自发吸热的过程；TG 分析可知，果胶-PDA 的
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热稳定性较改性前果胶-Ca 有所提高；果胶-PDA 上的 N、O 与溶液中 Th 发生的螯合作用是果胶-PDA 微球对
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Th 的主要吸附机理。
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关键词：果胶；多巴胺；Th ；吸附性；热稳定性；水处理技术与环境保护
中图分类号：TQ028.4 文献标识码：A 文章编号：1003-5214 (2019) 06-1217-12
Functional Preparation of Pectin-PDA Microspheres and
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Its Adsorption Properties for Th

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ZHANG Yong-de , ZHANG Si-yue , YI Fa-cheng , QIAO Dan , JIA Min-ming
（1. National Defense Key Discipline Laboratory of Nuclear Waste and Environmental Safety, Southwest University of
Science and Technology, Mianyang 621010, Sichuan, China; 2. Research Center of Biomass Materials, Ministry of
Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China; 3. School of Materials
Science and Engineering, Mianyang 621010, Sichuan, China）
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Abstract: Pectin-Ca microspheres were prepared by sol-gel method with Ca as cross-linking agent, and
then dopamine was used to modify the pectin-Ca microspheres to prepare functional pectin-PDA
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microspheres as adsorbent. The adsorption performance of this adsorbent for removing Th was discussed.
SEM, FTIR and XPS techniques were used to analyze the preparation of pectin-PDA microspheres and its
adsorption mechanism. The results showed that pectin-PDA microspheres had the best adsorption effect for
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Th at pH=3.5. The adsorption capacity of adsorbent reached 37.172 mg/g under the conditions of 25 ℃,
initial mass concentration of Th 4+ 24 mg/L, adsorbent dosage 0.03 g, and contact time 1200 min.
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Co-existing ions Cs , Sr , Mn and Mg had little effect on the adsorption of Th , indicating that the
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adsorbent had better adsorption selectivity for Th . The thermodynamics and kinetics showed that the
adsorption was described well by the Langmuir linear isotherm model and the kinetic data conformed to the
pseudo-second-order kinetics model. The maximum adsorption capacity was 99.010 mg/g. The
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thermodynamic data showed that the adsorption of Th by pectin-PDA was a spontaneous absorption. TG
analysis revealed that the thermal stability of pectin-PDA microspheres was better than that of pectin-Ca

收稿日期：2018-06-23; 定用日期：2019-02-01; DOI: 10.13550/j.jxhg.20180460
基金项目：国家核设施退役及放射性废物治理科研重点项目（14ZG6101）；西南科技大学平台基金项目(14tdsc01)；西南科技大学龙山
学术人才科研支持计划（17LZX202, 18LZX207）
作者简介：张永德（1970—），男，教授，博士生导师，电话：0816-6089373，E-mail：zhangyongde1969@126.com。