Synthesis, Characterization And Photocatalytic Degradation Properties Study On The Schiff Bases And Complexes With Furan Rings

Schiff bases containing the group RR1C=NR.2(R, R1, R2=H or else) constitute an important class of compounds which have the unique physical electro-optical properties, biological and pharmacological activities and showed the universal attention by researchers. And many compounds with furan rings showed the particular photoelectricity, antibacterial properties and antiviral. With the rapid development of industry, the plenty of wastewater generated has increased significantly. Based on that TiO2is the highly efficient and excellent photocatalyst under ultraviolet band, Schiff base and benzimidazole with furan rings were used for modifying the surface of TiO2, making a red shift possible and enhancing the photocatalytic activity of TiO2. The wavelength of maximum absorption increases to the visible light.The successful synthesis of the ligands N1,N2-bis((furan-2-yl)methylene)ethyl-1,2-diamine(L1),1-(2-furylmethylene)-2-(2-furyl)benzimidazole(L2), N’,N3-bis((furan-2-y1)methylene)benzene-1,3-diamine(L3), N1,N4-bis((furan-2-yl)methylene)benzene-1,4-diam-ine (L4). L1, L3, L4are Schiff base and L2is benzimidazole with furan rings. And eighteen chelate complexes are reported, respectively. All the synthesized ligands and complexes were characterized by elemental analysis, IR-spectroscopy, UV-vis Spectra, fluorescence properties and thermogravimetric anlysis (TGA), etc. Five of compounds were characterized by the X-ray structure analysis. The X-ray diffraction results of3,4and6reveal that they have intramolecular and intermolecular weak or strong π-π connection. The comparison of three structures and the strong fluorescence intensity studies suggest that the π-π interaction play significant roles in the properties of complexes. These compounds were used for modifying the surface of TiO2, obtained the corresponding catalyst, and IR-spectroscopy, UV-vis diffuse reflectance spectroscopy and Transmission electro microscopy technique were applied to investigate the structures and surface morphologies of the resultant samples. The photocatalytic activity of modified TiO2were evaluated by researching the degradation kinetics of4-nitrophenol(4-NP) in aqueous solution and under UV-visible light. The degradation reaction rate was greatly enhanced, which indicated that modified TiO2were more efficient than pure TiO2in degradation efficiency. This work makes a step toward the design highly active materials for dyed TiO2with Schiff base or benzimidazole containing furan rings. With these features, the dyed TiO2may find more potential applications and expansion in the fields of photocatalytic degradation of pollutants.In conclusion, the new point is using Schiff base and benzimidazole containing furan rings to dye TiO2to enhance the photocatalytic degradation activity. These experimental results will serve as a guide for enhancing the photocatalytic activity of TiO2.