改性PTFE纤维金属配合物的制备及其光催化降解性能

Polyacrylic acid grafted polytetrafluoroethylene (PAA-g-PTFE) fibers were coordinated with Fe + ions and with a mixture of Cu + and Fe + 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 Fe + coordinates with six carboxyl groups grafted on the surface of PAA-g-PTFE in the presence or absence of Cu + ion, and improved light adsorption properties are achieved in the UV and visible regions. When both metal ions coexist in solution, the Cu ion coordinates more easily with PAA-g-PTFE than Fe 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 Cu ions in the complex, dramatically improves the catalytic reusability at high pH value. [Article] doi: 10.3866/PKU.WHXB201210152 www.whxb.pku.edu.cn 物理化学学报(Wuli Huaxue Xuebao) Acta Phys. -Chim. Sin. 2013, 29 (1), 157-166 January Received: August 20, 2012; Revised: October 15, 2012; Published on Web: October 15, 2012. ∗Corresponding author. Email: dyefib@yahoo.com.cn; Tel: +86-22-83955359. The project was supported by the Tianjin Municipal Science and Technology Committee for a Research Program of Application Foundation and Advanced Technology, China (11JCZDJ24600) and National Natural Science Foundation of China (20773093). 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(20773093)资助项目 C Editorial office of Acta Physico-Chimica Sinica 157 Vol.29 Acta Phys. -Chim. Sin. 2013