Preparation and photocatalytic performance of Fe (III)-amidoximated PAN fiber complex for oxidative degradation of azo dye under visible light irradiation

被引:137
作者
Dong, Yongchun [1 ,2 ]
Han, Zhenbang [1 ]
Liu, Chunyan [1 ,2 ]
Du, Fang [1 ]
机构
[1] Tianjin Polytech Univ, Sch Text Sci & Engn, Div Text Chem & Ecol, Tianjin 300160, Peoples R China
[2] Fuzhou Univ, State Key Lab Breeding Base Photocatalysis, Fuzhou 350002, Peoples R China
关键词
PAN fiber; Ferric ion; Photocatalysis; Azo dye; Degradation; HYDROGEN-PEROXIDE; FENTON DEGRADATION; ORANGE-II; IRON-OXIDE; PART; DECOMPOSITION; KINETICS; IONS; PHOTODEGRADATION;
D O I
10.1016/j.scitotenv.2010.01.020
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Polyacrylonitrile (PAN) fiber was modified with hydroxylamine hydrochloride to introduce amidoxime groups onto the fiber surface These amidoxime groups were used to react with Fe (III) ions to prepare Fe (III)-amidoximated PAN fiber complex, which was characterized using SEM, XRD, FTIR, XPS. DMA. and DRS respectively. Then the photocatalytic activity of Fe-AO-PAN was evaluated in the degradation of a typical azo dye, C. I. Reactive Red 195 in the presence of H2O2 under visible light irradiation. Moreover, the effect of the Fe content of Fe-AO-PAN on dye degradation was also investigated The results indicated that Fe (Ill) ions can crosslink between the modified PAN fiber chains by the coordination of Fe (III) ions with the amino nitrogen atoms and hydroxyl oxygen atoms of the amidoximation groups to form Fe (III)-amidoximated PAN fiber complex, and the Fe content of which is mainly determined by Fe (III) ions and amidoximation groups Fe (III)-amidoximated PAN fiber complex is found to be activated in the visible light region Moreover, Fe (III)-amidoximated PAN fiber complex shows the catalytic activity for dye degradation by H2O2 at pH = 60 in the dark, and can be significantly enhanced by increasing light irradiation and Fe content, therefore, it can be used as a new heterogeneous Fenton photocatalyst for the effective decomposition of the dye in water In addition. ESR spectra confirm that Fe (III)-amidoximated PAN fiber complex can generate more center dot OH radicals from H2O2 under visible light irradiation, leading to dye degradation A possible mechanism of photocatalysis is proposed. (C) 2010 Elsevier B V All rights reserved
引用
收藏
页码:2245 / 2253
页数:9
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