Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (01): 157-166.doi: 10.3866/PKU.WHXB201210152

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

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).

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