Fe(bpy)32+ supported on amidoximated PAN fiber as effective catalyst for the photodegradation of organic dye under visible light irradiation
Fe(bpy)32+ supported on amidoximated PAN fiber as effective catalyst for the photodegradation of organic dye under visible light irradiation
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DOI：
10.1016/j.cej.2013.05.006
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发表时间：
2013-07
影响因子：
15.1
通讯作者：
Zhenbang Han;Jia Guo;Wei Li
中科院分区：
文献类型：
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作者：
Zhenbang Han;Jia Guo;Wei Li
将Fe(Bpy)3 2+负载到聚丙烯腈(PAN)纤维上，制备了一种新型的多相Fenton光催化剂，并将其用于可见光下降解有机染料。FTIR、XPS和UV-Vis漫反射光谱分析表明，Fe(Bpy)32+分子在固定在纤维载体上时发生了扭曲，胺基上的单键H与Fe(Bpy)32+发生了相互作用。在可见光照射下，该催化剂在中性pH条件下对罗丹明B的降解和矿化具有很高的效率，并且可以很容易地回收使用，而不会失去任何活性。由于未改性的PAN纤维负载的Fe(Bpy)32+不具有任何光活性，因此认为Fe(Bpy)32+与单键H基团的相互作用是高催化性能的原因。单键H基团与2，2‘-联吡啶配体结合可以为铁(II/III)离子提供一个灵活的双功能配位环境。ESR研究表明，羟基自由基参与了这一光催化过程，并提出了可能的机理。
A novel heterogeneous Fenton photocatalyst was prepared by supporting Fe (bpy) 3 2+ onto amidoximated polyacrylonitrile (PAN) fiber and then used for the degradation of organic dye under visible irradiation. FTIR, XPS and UV–vis diffuse reflectance spectroscopy analyses suggest that the Fe (bpy) 3 2+ molecules were distorted during their immobilization onto the fiber support, and the Osingle bondH groups in amidoxime group had interacted with Fe (bpy) 3 2+. Upon visible light irradiation, the catalyst was found to be highly effective for the degradation and mineralization of Rhodamine B at a neutral pH and could be easily recycled without any loss of activity. The interaction of Osingle bondH groups with Fe (bpy) 3 2+ groups was considered to be responsible for the high catalytic performance since the Fe (bpy) 3 2+ supported on unmodified PAN fiber did not show any photoactivity. The Osingle bondH groups in conjunction with 2, 2′-bipyridine ligands may provide a flexible bifunctional coordination environment for iron (II/III) ions. ESR studies indicate that hydroxyl radicals are involved in this photocatalysis process, and a possible mechanism is proposed.