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Acta Phys. Chim. Sin.  2013, Vol. 29 Issue (12): 2513-2522    DOI: 10.3866/PKU.WHXB201310233
THERMODYNAMICS, KINETICS, AND STRUCTURAL CHEMISTRY     
Coordination Kinetics of Fe3+ with Membranes Based on Modified PAN Nanofibers with Different Diameters, and Catalytic Effect of Their Complexes on Decomposition of Organic Dye
ZHAO Xue-Ting1, DONG Yong-Chun1,2, CHENG Bo-Wen1, KANG Wei-Min1
1 Division of Textile Chemistry & Ecology, School of Textiles, Tianjin Polytechnic University, Tianjin 300387, P. R. China;
2 Key Laboratory of Advanced Textile Composites, Ministry of Education, Tianjin Polytechnic University, Tianjin 300387, P. R. China
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Abstract  

Membranes produced from modified polyacrylonitrile (PAN) nanofibers with different diameters were prepared by electrospinning and amidoximation. They were then used as ligands to coordinate with Fe3+ for preparing modified PAN nano-fibrous membrane Fe complexes. The coordination kinetics of three modified PAN nano-fibrous membranes with Fe3+ were studied, and the effects of temperature and the Fe3+ initial concentration on the coordination kinetics were also examined. Finally, the catalytic activities of the three modified PAN nano- fibrous membrane Fe complexes were evaluated as heterogeneous Fenton catalysts in the degradation of an organic dye. The effect of fiber diameter on the catalytic activity of the complexes was investigated. The results indicated that within the observed temperature and concentration ranges, the equilibrium data for the coordination of Fe3+ with the modified PAN nano-fibrous membranes correlated with the Langmuir and Freundlich isotherm equations, but the coordination kinetics showed better agreement with the Lagergren second-order equation. Modified PAN nanofibrous membranes with small diameters showed higher Fe- coordinating capacities and reaction rate constants under the same conditions, indicating that they reacted with Fe3+ more easily than the others did. Better catalytic activities for dye degradation were found for the three modified PAN nanofibrous membrane Fe complexes in the dark, and these were further improved by light irradiation. The catalytic activities of the complexes were significantly affected by the nanofiber diameter. The complex prepared using a modified PAN nanofibrous membrane with fibers of an appropriate diameter exhibited the best catalytic activity.



Key wordsPAN nano-fibrous membrane      Fe3+      Coordination kinetics      Photocatalysis      Fenton reaction      Dye degradation     
Received: 12 August 2013      Published: 23 October 2013
MSC2000:  O643  
Fund:  

The project was supported by the Tianjin Municipal Science and Technology Committee for a Research Program of Application Foundation and Advanced Technology, China (11JCZDJC24600, 11ZCKFGX03200) and National Natural Science Foundation of China (20773093, 51102178).

Corresponding Authors: DONG Yong-Chun     E-mail: dye@tjpu.edu.cn
Cite this article:

ZHAO Xue-Ting, DONG Yong-Chun, CHENG Bo-Wen, KANG Wei-Min. Coordination Kinetics of Fe3+ with Membranes Based on Modified PAN Nanofibers with Different Diameters, and Catalytic Effect of Their Complexes on Decomposition of Organic Dye. Acta Phys. Chim. Sin., 2013, 29(12): 2513-2522.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201310233     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2013/V29/I12/2513

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