Study On Photocatalytic Performance Of Ion-doped Nano-titanium Dioxide Synthesized By Detonation Method

Nano-titanium dioxide is an n-type semiconductor material, due to its appropriate band gap can use sunlight photocatalytic degradation of organic and inorganic pollutants. With cheap, no secondary pollution, stable and easy to control, simple structure, strong oxidizing ability, etc., are widely used in many fields. In recent years, the photocatalytic properties of semiconductors rapid development in environmental protection, health care, self-cleaning and other fields.Band gap of titanium dioxide decided which can only be excited by the sun’s UV with photocatalytic, while UV in sunlight only7%, which greatly reduces the utilization of sunlight. Therefore, changing the structure of the titanium dioxide to improve the photocatalytic activity and improve the utilization of sunlight, has important significance. There are a lot of modified titanium dioxide photocatalytic methods, this paper selected ion doping. Many methods for preparing nano-titanium dioxide is applied to ion doping, but detonation has not yet been applied. So, this paper choose detonation method to prepare ion-doped nano-titanium dioxide to improve its photocatalytic activity.Prepared by the detonation of Zn and Cu doped with different doped concentrations of nano-titanium dioxide. XRD, TEM characterization found that the resulting samples were nanoscale anatase and rutile phase mixed crystal, both ions were doped made anatase content to changes. Series of optical characterization methods found that the band gap, the photocatalytic activity of Cu-doped nano-titanium dioxide has been greatly changed.The samples were made a series of photocatalytic degradation of methyl orange experiment. It was found that:a lower doping concentration of Zn to improve the photocatalytic activity of titanium dioxide, but when the concentration is too high will reduce the photocatalytic activity; the photocatalytic of Cu-doped titanium dioxide enhanced with increasing doping concentration.Explores the effects of titanium dioxide dosage, initial solution pH value, the initial concentration of methyl orange, catalytic time and other factors to the photocatalytic effect. The results showed that:in a certain range the greater the amount of titanium dioxide the photocatalytic effect is better; pH value of acidic, the lower initial concentration of methyl orange, the longer photocatalytic time, the photocatalytic effect will be better. Try to adjust the mass fraction of RDX to control the anatase phase content of the product. Experimental results showed that:due to the detonation process is high temperature, high pressure, high detonation velocity, transient response characteristics, it is difficult to control the anatase content of the product by RDX mass fraction.