Preparation And Photocatalytic Degradation Performance Of Ag/AgBr/TiO₂ Nanocomposite

With rapid development of industry and technology,it can inevitably cause a harmful effect on the environment and human.To overcome these problems,developing the promising catalysts is essential.Titanium dioxide is widely used due to its well stability,low cost,no toxicity and good photocatalytic performance.However,TiO₂ only responses to ultraviolet light because of wide band gap.Preparing Ti³⁺ self-doped TiO₂ nanoparticles and Ag/Ag Br/TiO₂ improved the photocatalytic activity of degrading organic dye in this paper.X-ray diffraction,scanning electron microscopy and UV-vis spectrophotometer were used to characterize the crystal structure,morphology and the light absorption property of samples.Degrading organic dye in the visible light and comparing their photocatalytic performance.The possible phocatalytic mechanism is propo sed in detail.Self-doping TiO₂ with Ti³⁺ nanoparticles were prepared by solvent method.TiO₂ nanoparticles showed response to visible light.Temperature,titanium precursor and solvent had great influence on the crystal structure,particle size and morphology of TiO₂.TiO₂ with tetrabutyl titanate as titanium precursor,ethylene glycol as solvent and temperature at 200 ℃ showed the highest photocatalytic activity with degradation efficiency up to 97.6% toward degradation of Rh B in visible light.The stability was very well.The holes played important role in degradation of Rh B.Ag/Ag Br/TiO₂ nanocomposites were prepared by deposition-precipitation,photoreduction method.With the modification amount of Ag/AgBr in the Ag/AgBr/TiO₂ increased,the photocatalytic activity of Ag/Ag Br/TiO₂ gradually enhanced in comparision with TiO₂.70-Ag showed the highest photocatalytic activity with degradation efficiency up to 95.4% toward degradation of MO in visible light.The stability was very well.It was 6.36-fold higher activity than TiO₂.The holes played important role in degradation of MO.