The Modification Research Of Photocatalytic Performance Of TiO₂ Nanomaterials

TiO₂ has gained wide attention in the field of photodegradable water pollution by virtue of its good photochemical stability and low toxicity,and it can utilize the advantages of sunlight to effectively degrade organic pollutants without secondary pollution.The main purpose of this study is to improve the photocatalytic activity of the modified TiO₂ photocatalyst.The anatase TiO₂ and TiO₂ doped with different molar ratios of Y³⁺and Ce³⁺were prepared by sol-gel method.The prepared TiO₂ catalysts were systematically characterized by scanning electron microscopy?SEM?and ultraviolet-visible spectrophotometer?UV-Vis?.Under the condition of xenon lamp irradiation,the photocatalytic performance of TiO₂catalyst was analyzed by the degradation effect of methylene blue.The main work of this thesis is as follows:?1?For the TiO₂ photocatalyst doped with different molar ratio Y³⁺,the methylene blue is the target degradant,and the optimal doping molar ratio is 0.03.The degradation rate can reach 73.92%in 120 minutes.On this basis,0.03Y³⁺-TiO₂ is used for Li⁺co-doping.Thereby,the photocatalytic efficiency thereof is further improved,so that the degradation rate of the catalyst to methylene blue is as high as 88.12%.?2?For the TiO₂ photocatalyst doped with different molar ratio Ce³⁺,the methylene blue is the target degradant,and the optimum doping molar ratio was0.01,and the degradation rate could reach 93.8%in 150 minutes.On this basis,0.01Ce³⁺-TiO₂ was co-doped with Li⁺,which further improved the photocatalytic efficiency,and the degradation rate of methylene blue was up to 95.4%.