工业水处理 ›› 2025, Vol. 45 ›› Issue (1): 58-65. doi: 10.19965/j.cnki.iwt.2023-1233

• 试验研究 • 上一篇    下一篇

单宁酸复合海藻酸钠微球富集U(Ⅵ)的性能

刘清1,2(), 黄健滨1,2, 李伟凡1, 招国栋3, 杨景景1,2   

  1. 1. 南华大学土木工程学院,湖南 衡阳 421001
    2. 南华大学污染控制与资源化技术湖南省 高校重点实验室,湖南 衡阳 421001
    3. 南华大学资源环境与安全工程学院,湖南 衡阳 421001
  • 收稿日期:2024-11-04 出版日期:2025-01-20 发布日期:2025-01-22
  • 作者简介:

    刘清(1979— ),博士,教授,硕士生导师。E-mail:

  • 基金资助:
    湖南省教育厅重点项目(21A0286); 湖南省自然科学基金项目(2023JJ50133)

Performance of U(Ⅵ) enrichment by tannic acid sodium and alginate composite microspheres

Qing LIU1,2(), Jianbin HUANG1,2, Weifan LI1, Guodong ZHAO3, Jingjing YANG1,2   

  1. 1. School of Civil Engineering, University of South China, Hengyang 421001, China
    2. Hunan Provincial Key Laboratory of Pollution Control and Resource Utilization Technology, University of South China, Hengyang 421001, China
    3. School of Resources, Environment and Safety Engineering, University of South China, Hengyang 421001, China
  • Received:2024-11-04 Online:2025-01-20 Published:2025-01-22

摘要:

随着核能的大力发展,开发环境友好型生物基吸附剂对放射性核素污染控制具有重要意义。采用混合交联法制备一种新型单宁酸复合海藻酸钠(TA/SA)微球,考察了TA和SA质量比、溶液pH、U(Ⅵ)初始浓度、接触时间和温度等因素对TA/SA吸附U(Ⅵ)行为的影响,并进行了吸附动力学和热力学研究,探讨了TA/SA微球对U(Ⅵ)的吸附机理。结果表明,TA和SA的最佳质量比为1∶2,pH对TA/SA微球吸附U(Ⅵ)效果的影响较小。在U(Ⅵ)质量浓度为50 mg/L,TA/SA微球投加量为0.1 g/L,溶液pH=4,温度为323 K,吸附时间为2 h时,TA/SA微球对U(Ⅵ)的最大吸附量为263.42 mg/g。TA/SA微球对U(Ⅵ)的吸附行为符合准二级反应动力学模型和Freundlich等温吸附模型,TA/SA微球对U(Ⅵ)的吸附是一个自发吸热过程,且反应可分为表面吸附、中孔内扩散和微孔内扩散3个阶段。TA/SA表面呈不规则沟壑状,内部是大量开孔的三维网状结构,还原反应在TA/SA微球对U(Ⅵ)的吸附中起主导作用。

关键词: 单宁酸, 海藻酸钠, 吸附, 放射性核素,

Abstract:

With the rapid development of nuclear energy, the development of environmentally friendly bio-based adsorbents is of great significance for controlling radioactive nuclide pollution. A novel tannic acid and sodium alginate (TA/SA) composite microsphere was prepared using a mixed crosslinking method. The effects of TA/SA mass ratio, solution pH, initial concentration of U(Ⅵ), contact time, and temperature on the adsorption behavior of U(Ⅵ) by TA/SA microspheres were investigated, and the adsorption kinetics and thermodynamics were studied. The adsorption mechanism of TA/SA microspheres on U (Ⅵ) was also explored. The results showed that the optimal mass ratio of TA to SA was 1∶2, and pH had little effect on the adsorption of U(Ⅵ) by TA/SA microspheres. When the mass concentration of U(Ⅵ) was 50 mg/L, the dosage of TA/SA microspheres was 0.1 g/L, the solution pH was 4, the temperature was 323 K, and the contact time was 2 hours, the maximum adsorption capacity of TA/SA microspheres for U(Ⅵ) was 263.42 mg/g. The adsorption behavior conformed to the quasi second order kinetic model and Freundlich isotherm adsorption model. The adsorption of U(Ⅵ) by TA/SA microspheres was a spontaneous endothermic process, and the reaction could be divided into three stages, including surface adsorption, mesopore diffusion, and micropore diffusion. TA/SA microspheres had an irregular grooved surface and a three-dimensional network structure with numerous openings inside. The reduction reaction played a dominant role in the adsorption of U (Ⅵ) by TA/SA microspheres.

Key words: tannins, sodium alginate, adsorption, radioactive nuclide, uranium

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