School of Chemistry, Northeast Normal University, Changchun 130024, PR China; School of Environment, Northeast Normal University, Changchun 130024, PR China.
School of Environment, Northeast Normal University, Changchun 130024, PR China.
Sci Total Environ. 2019 Mar 15;656:1010-1020. doi: 10.1016/j.scitotenv.2018.11.419. Epub 2018 Nov 29.
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 [Fe(dpbpy)(HO)]/TiO, [Fe(dpbpy)(phen)]/TiO and [Fe(dpbpy)(bpy)]/TiO (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 TiO or 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 TiO by 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.
光催化是消除水体中各种有机污染物的有效策略之一。本文制备了一系列新型复合光催化剂，用于在可见光照射下降解苯酚和诺氟沙星。它们是[Fe(dpbpy)(HO)]/TiO、[Fe(dpbpy)(phen)]/TiO 和 [Fe(dpbpy)(bpy)]/TiO（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均优于纯 TiO 或 P25。苯酚几乎可以完全降解，诺氟沙星（NOR）的活性基团或取代基也可以被破坏，从而大大降低了水中苯酚和诺氟沙星的生物毒性。基于自由基捕获试验和密度泛函理论计算，提出了利用 Fe 配合物提高 TiO 光催化活性和稳定性的可能机制。很明显，Fe-配合物与二氧化钛之间的界面相互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。
