Novel photocatalytic system Fe-complex/TiO2 for efficient degradation of phenol and norfloxacin in water.
Novel photocatalytic system Fe-complex/TiO2 for efficient degradation of phenol and norfloxacin in water.
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DOI：
10.1016/j.scitotenv.2018.11.419
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
Xinyue Wang;Yin-Xia Sun;Lu Yang;Q. Shang;Dan Wang;T. Guo;Yihang Guo
中科院分区：
文献类型：
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作者：
Xinyue Wang;Yin-Xia Sun;Lu Yang;Q. Shang;Dan Wang;T. Guo;Yihang Guo
光催化是去除水体中各种有机污染物的有效手段之一。本论文制备了一系列新型复合光催化剂，在可见光照射下降解苯酚和诺氟沙星。它们分别是[Fe Ⅱ（dpbpy）2（H2O）2]/TiO 2、[Fe Ⅱ（dpbpy）（phen）2]/TiO 2和[Fe Ⅱ（dpbpy）（bpy）2]/TiO 2（dpbpy：2，2 ′-联吡啶-4，4 ′-二磷酸，phen：1，10-菲咯啉，bpy：2，2-联吡啶）。结果表明，它们的光催化性能和循环稳定性远优于纯TiO 2或P25。苯酚几乎完全被降解，诺氟沙星（NOR）的活性基团或取代基也被破坏，大大降低了苯酚和诺氟沙星在水中的生物毒性。基于自由基捕获实验和密度泛函理论计算，提出了Fe配合物提高TiO 2光催化活性和稳定性的可能机理.可见，铁络合物与二氧化钛之间的界面作用直接影响复合光催化剂的光催化活性和稳定性。配合物的共轭结构起着至关重要的作用。
Photocatalysis is one of the effective strategies to eliminate various organic pollutants in water body. In this paper we have prepared a series of new composite photocatalysts to degrade phenol and norfloxacin under visible light irradiation. They were [FeII(dpbpy)2(H2O)2]/TiO2, [FeII(dpbpy)(phen)2]/TiO2and [FeII(dpbpy)(bpy)2]/TiO2(dpbpy: 2,2′-bipyridine-4,4′-diphosphoric acid, phen: 1,10-phenanthroline, bpy: 2,2-bipyridyl). The results show that their photocatalytic performance and cyclic stability are much better than that of pure TiO2or P25. Phenol can be degraded almost completely and the active groups or substituents of norfloxacin (NOR) can be destroyed also, which greatly reduced the biological toxicity of phenol and norfloxacin in water. The possible mechanisms of improving the photocatalytic activity and stability of TiO2by using Fe-complex are proposed based on free radical capture test and density functional theory calculation. It is clearly that the interfacial interaction between Fe-complex and titanium dioxide directly affects the photocatalytic activity and stability of the composite photocatalyst. The conjugated structure of the complexes plays a crucial role.