Citation: DING Zhi-Zhong, DONG Yong-Chun, LI Bing, LI Miao. Preparation of Grafted PTFE Fiber Metallic Complexes and Their Photocatalytic Degradation Abilities[J]. Acta Physico-Chimica Sinica, ;2013, 29(01): 157-166. doi: 10.3866/PKU.WHXB201210152 shu

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

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 Date: 20 August 2012
Available Online: 15 October 2012
Fund Project: 天津市应用基础与前沿技术重点研究计划(11JCZDJC24600) (11JCZDJC24600)国家自然科学基金(2020773093)资助项目 (2020773093)

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.
- Polytetrafluoroethylene fiber,
- Metallic complex,
- Coordination structure,
- Photocatalysis,
- Fenton reaction,
- Dye degradation
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