物理化学学报 >> 2013, Vol. 29 >> Issue (01): 157-166.doi: 10.3866/PKU.WHXB201210152

催化和表面科学 上一篇    下一篇

改性PTFE纤维金属配合物的制备及其光催化降解性能

丁志忠1, 董永春1,2, 李冰1, 李淼1   

  1. 1 天津工业大学纺织学院纺织化学与生态研究中心, 天津 300387;
    2 福州大学光催化国家重点实验室培育基地, 福州 350002
  • 收稿日期:2012-08-20 修回日期:2012-10-15 发布日期:2012-12-14
  • 通讯作者: 董永春 E-mail:dyefib@yahoo.com.cn
  • 基金资助:

    天津市应用基础与前沿技术重点研究计划(11JCZDJC24600)和国家自然科学基金(2020773093)资助项目

Preparation of Grafted PTFE Fiber Metallic Complexes and Their Photocatalytic Degradation Abilities

DING Zhi-Zhong1, DONG Yong-Chun1,2, LI Bing1, LI Miao1   

  1. 1 Division of Textile Chemistry & Ecology, School of Textiles, Tianjin Polytechnic University, Tianjin 300387, P. R. China;
    2 State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou 350002, P. R. China
  • Received:2012-08-20 Revised:2012-10-15 Published:2012-12-14
  • Supported by:

    The project was supported by the Tianjin Municipal Science and Technology Committee for a Research Program of Application Foundation and Advanced Technology (11JCZDJ24600) and National Natural Science Foundation of China (20773093).

摘要:

使用聚丙烯酸接枝改性聚四氟乙烯(PAA-g-PTFE)纤维分别与Fe3+及其与Cu2+的混合物反应制备改性PTFE纤维铁和铁铜双金属配合物, 并分别使用傅里变换叶红外(FTIR)光谱和紫外-可见(UV-Vis)漫反射光谱(DRS)对两种配合物的化学结构和光吸收性能进行表征. 然后将两种配合物分别作为非均相光Fenton 反应催化剂应用于典型偶氮染料活性蓝222氧化降解反应中, 考察和比较了二者在不同pH介质中对降解反应的催化作用. 结果表明, 在有或无Cu2+的存在条件下, 一个Fe3+能够与三个PAA-g-PTFE表面的6个羧基发生反应形成配合物, 并且它们在紫外和可见光区表现出好的光吸收特性. 当两种金属离子共存时Cu2+比Fe3+更容易与PAA-g-PTFE发生配位反应形成铁铜双金属配合物. 在可见光辐射下PAA-g-PTFE铁配合物对不同pH水溶液中染料降解反应均表现出显著的催化作用, 但是溶液pH的升高不利于配合物催化活性的发挥. 而配合物中铁离子含量提高特别是引入Cu2+作为助金属离子能够较大幅度地改善其在高pH范围内的催化活性和重复利用性.

关键词: 聚四氟乙烯纤维, 金属配合物, 配位结构, 光催化, Fenton反应, 染料降解

Abstract:

Polyacrylic acid grafted polytetrafluoroethylene (PAA-g-PTFE) fibers were coordinated with Fe3+ ions and with a mixture of Cu2+ and Fe3+ ions to prepare PAA-g-PTFE Fe and Cu-Fe bimetallic complexes. The chemical structures and light adsorption properties of the complexes were characterized using Fourier transform infrared (FTIR) spectrometry and UV-Vis diffuse reflection spectroscopy (DRS), respectively. The complexes were used as heterogeneous photo-Fenton catalysts in the oxidative degradation of the azo dye, Reactive Blue 222, in different pH aqueous media. The results indicate that Fe3+ coordinates with six carboxyl groups grafted on the surface of PAA-g-PTFE in the presence or absence of Cu2+ ion, and improved light adsorption properties are achieved in the UV and visible regions. When both metal ions coexist in solution, the Cu2+ ion coordinates more easily with PAA-g-PTFE than Fe3+ to produce a PAA-g-PTFE Cu-Fe bimetallic complex. Moreover, PAA-g-PTFE Fe significantly increases the degradation of Reactive Blue 222 in the pH range 3-9 under visible irradiation. However, at high pH conditions (> 7) the catalytic ability is reduced. Increasing the Fe content, and especially incorporating Cu2+ ions in the complex, dramatically improves the catalytic reusability at high pH value.

Key words: Polytetrafluoroethylene fiber, Metallic complex, Coordination structure, Photocatalysis, Fenton reaction, Dye degradation

MSC2000: 

  • O643.2