噻吩醛缩乙二胺席夫碱及其配合物的合成与光催化性能

基于TiO₂光催化性能的染料敏化改性,采用2-噻吩甲醛缩合乙二胺合成了席夫碱配体L,并与金属配合得到了金属配合物ZnLCl₂](1),NiL'(NO₃)₂](2)(L'为单噻吩醛缩乙二胺),对配体L、配合物1 和2进行了X射线单晶衍射结构分析。 用合成的配体和配合物修饰TiO₂得到相应的复合光催化剂L-TiO₂、1-TiO₂和2-TiO₂,并进行了红外光谱、紫外-可见漫反射光谱、粉末X射线衍射图谱等表征,研究了这3种光催化剂降解水中有机污染物4-硝基酚(4-NP)和罗丹明B(RhB)的催化活性。 结果表明,1-TiO₂、2-TiO₂可以有效的降解4-NP和RhB,降解率可达90%以上。

Synthesis and Photocatalysis of Metal Complexes with Schiff Base Derived from 2-Thiophene Carboxaldehyde and Ethylenediamine

The ligand N,N'-bis(thiophenaldehyde) ethylenediamine(L) obtained by the condensation between 2-thiophene carboxaldehyde and ethylenediamine were used for synthesis of new complexes ZnLCl₂](1) and NiL'(NO₃)₂](2)(L'-thiophenaldehyde-ethylenediamine). The structures of these complexes and ligand were characterized by single crystal X-ray analysis. These compounds were used for modifying the surface of TiO₂. The obtained photocatalysts(L-TiO₂, 1-TiO₂, 2-TiO₂) were characterized by IR spectra, UV-Vis diffuse reflectance spectroscopy and XRD. Their photocatalytic activities in the photodegradation of 4-nitrophenol(4-NP) and Rhodamine B(RhB) were evaluated under UV-visible light irradiation. The results revealed higher photocatalytic activities of 1-TiO₂ and 2-TiO₂ than that of bare TiO₂. In addition, the degradation rate can reach above 90%.