高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (8): 1761-1770.doi: 10.7503/cjcu20140037

• 物理化学 • 上一篇    下一篇

不同含羧酸纤维与铁离子的配位反应动力学及配合物的催化降解性能

李冰1, 董永春1,2()   

  1. 1. 天津工业大学纺织学院纺织化学与生态学研究中心, 2. 教育部先进纺织复合材料重点实验室, 天津 300387
  • 收稿日期:2014-01-13 出版日期:2014-08-10 发布日期:2019-08-01
  • 作者简介:联系人简介: 董永春, 男, 博士, 教授, 主要从事纺织化学与环保技术研究. E-mail: teamdong@sina.cn
  • 基金资助:
    天津市应用基础与前沿技术研究计划重点项目(批准号: 11JCZDJC24600)和国家自然科学基金(批准号: 20773093)资助

Coordination Kinetics of Different Carboxylic Fiber with Fe3+ and Catalytic Degradation Performance of Their Fe3+ Complexes

LI Bing1, DONG Yongchun1,2,*()   

  1. 1. Division of Textile Chemistry & Ecology, School of Textiles, 2. Key Laboratory of Advanced Textile Composite of Ministry of Education, Tianjin Polytechnic University, Tianjin 300387, China
  • Received:2014-01-13 Online:2014-08-10 Published:2019-08-01
  • Contact: DONG Yongchun E-mail:teamdong@sina.cn
  • Supported by:
    Supported by the Tianjin Municipal Science and Technology Committee for a Research Program of Application Foundation and Advanced Technology, China(No.11JCZDJ24600) and the National Natural Science Foundation of China(No;20773093)

摘要:

分别使用具有相似羧基含量的海藻纤维、 丙烯酸接枝改性聚四氟乙烯纤维和聚丙烯纤维(PAA-g-PP 和PAA-g-PTFE)3种含羧酸纤维与Fe3+进行配位反应, 研究和比较了反应的动力学特性及影响因素. 将3种含羧酸纤维铁配合物分别作为非均相Fenton反应催化剂应用于染料降解反应中, 分析和评价了其配位结构和表面性能对催化活性的影响. 结果表明, 在所涉及的温度和浓度范围内, 3种含羧酸纤维与Fe3+的反应均很好地符合Langmuir等温吸附模型和Lagergren准二级动力学方程. Fe3+初始浓度的增加会降低反应速率常数, 而反应温度的升高则会增加配合物中Fe3+的配合量. 在相同反应条件下, 海藻纤维比PAA-g-PP和PAA-g-PTFE更容易与Fe3+发生反应, 且反应速率常数和Fe3+配合量按照下列顺序排列: 海藻纤维>PAA-g-PP>PAA-g-PTFE. 3种含羧酸纤维铁配合物都能够在染料氧化降解反应中作为非均相Fenton催化剂, 且紫外光比可见光更能够提高其催化活性. 海藻纤维铁配合物比其它2种含羧酸纤维铁配合物具有更好的催化作用, 这与三者在配位结构和表面性能之间的显著差异有关.

关键词: 海藻纤维, 羧基, 铁离子, 配位反应, 催化活性, 染料降解, 配位反应动力学

Abstract:

Three carboxylic fibers including alginate fiber, polyacrylic acid grafted polypropylene and polyte-trafluoroethylene fibers(PAA-g-PP and PAA-g-PTFE) with similar carboxyl contents were coordinated with Fe3+, respectively to prepare the different Fe(Ⅲ)-carboxylic fiber complexes. The coordinating kinetics of three carboxylic fibers with Fe3+ was compared, and the effecting factors were also examined. And the catalytic performance of three Fe(Ⅲ)-carboxylic fiber complexes was then evaluated as the heterogeneous Fenton catalysts in the dye degradation in water. The results indicated that within the observed temperature and concentration range, the coordination of carboxylic fiber with Fe3+showed better agreement with Langmuir isotherm equation and Lagergren second order equation. Increasing Fe3+initial concentration led to a low coordination rate constant. Higher temperature increased the Fe content of the resulting complexes. Alginate fiber reacted more easily with than PAA-g-PP and PAA-g-PTFE at the same conditions. Moreover, their coordination rate constants and Fe contents were ranked as follow: alginate fiber >PAA-g-PP >PAA-g-PTFE. Three Fe(Ⅲ)-carboxylic fiber complexes acted as the heterogeneous Fenton catalysts for dye degradation. UV irradiation could more significantly enhance the catalytic capacity of the complexes than visible irradiation. Fe(Ⅲ)-alginate fiber complex has a higher catalytic performance than the other Fe(Ⅲ)-carboxylic fiber complexes with similar Fe content, which is in relation to the big difference in coordinating structure and surface property between them.

Key words: Alginate fibers, Carboxyl group, Ferric ion, Coordination, Catalysis, Dye degradation, Coordination kinetics

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