The Preparation Of PANI/Fe-N-TiO₂ Composite Materials And Photocatalytic Performance Rresearch

Using the sol-gel method,tetra-n-butyl titanate[Ti?OC₄H₉?₄]as precursor,absolute ethyl alcohol?C₂H₅OH?as solvent,glacial acetic acid?CH₃COOH?as inhibitor,synthesized nanoscale TiO₂ photocatalyst.Under the condition of uv investigate the degradation efficiency of methyl orange simulated organic wastewater,to determine the ratio of reagents by L₉?3⁴?orthogonal experiments.The results show that the Ti?OC₄H₉?₄:C₂H₄O₂:H₂O:C₂H₅OH?mole ratio?=1:7:8:20.Calcination temperature has a significant effect on TiO₂ crystal structure and when the calcination temperature is 400?,anatase type has the highest degree of crystallization.Under ultraviolet light,the optimumt addition amount of nitrogen doped TiO₂prepared by the sol-gel method with the condition of the 400?calcination temperature is 30%?mole ratio?.XRD analysis shows that the nitrogen doping does not affect the change the crystal structure of TiO₂ light catalyst samples,but nitrogen doping can cause suppression of TiO₂ grain growth,making the grain refinement,causing Ti O₂ crystal lattice distortion;DRS analysis shows that the curve of the nitrogen doped TiO₂ photocatalyst samples occurre red shift,improving the photocatalytic properties of TiO₂.On the basis of the best nitrogen doping process,using the sol-gel method with the condition of the 400?calcination temperature,the best addition amount of iron is 0.1%?mole ratio?under ultraviolet light.Under this experimental condition,the best doping amount of iron nitrogen doped TiO₂ photocatalyst is n?TiO₂?:n?Fe?:n?n?=1:30%:0.1%.XRD analysis shows that the iron doping does not affect the change the crystal structure of TiO₂ light catalyst samples,but with the increase of iron doping amount,characteristic peak intensity is decreasing.At the same time doping will cause suppression of TiO₂ grain growth,making the grain refinement and cause TiO₂ crystal lattice distortion;DRS analysis shows that the curve of the iron nitrogen doped TiO₂ photocatalyst sample is further redshift,enhancing absorption of light to visible light which can improve the photocatalytic performance of TiO₂.By in-situ oxidation prepare PANI/Fe-N-TiO₂ catalyst samples,the best addition amount of polyaniline is 2%?mole ratio?under ultraviolet lightt.Under this experimental condition,the PANI/Fe-N-TiO₂ photocatalyst best doping amount is n?TiO₂?:n?Fe?:n?N?:n?PANI?=1:30%:0.1%:2%.XRD analysis shows that the doped polyaniline will not affect change the crystal structure of TiO₂ photocatalyst samples,but as the polyaniline addition can significantly improve the photocatalytic activity of Fe-N-TiO₂ catalyst sample.PANI is a good conductor of hole-transporting,can improve the ability of TiO₂ interface charge transfer and reduce the photoproduction electronic and optical cavity compound rate.