The iron doping titanium dioxide was prepared by sol-gel,step precipitation,co-precipitation and immersion methods,respectively.The photocatalytic activities of these prepared samples were evaluated in X-3B dispersion...The iron doping titanium dioxide was prepared by sol-gel,step precipitation,co-precipitation and immersion methods,respectively.The photocatalytic activities of these prepared samples were evaluated in X-3B dispersion irradiated under UV.The experimental results showed that the immersion method,especially using the nano TiO2 as immersion matrix,greatly enhanced the photocatalytic activity.One fold enhancement in photocatalytic activity was observed in the case of the sample prepared by immersion doping method.This may be attributed to the nano-size effect,the irreversible hole trapper in non-saturated bonding field of Fe3＋ and larger lattice strain.展开更多
Nanosized TiO2 powder with anatase and rutile structures was synthesized by a sol gel method using TiCl4 ethanol solution as a precursor.The grain size ofTiO2 powder was about 63nm after the precursor was calcined at ...Nanosized TiO2 powder with anatase and rutile structures was synthesized by a sol gel method using TiCl4 ethanol solution as a precursor.The grain size ofTiO2 powder was about 63nm after the precursor was calcined at 600℃for 2 hours .The experimental techniques of XRD,TEM and Particle Distribution were used to characterize the synthesized specimens. Various special effects were investigated for their contribution to crystal structure and the size of TiO2 powder .Theformation of anatase as well as the rutile phase of TiO2 was indicted from the XRD when the reaction temperature was above 30℃and when the sol was irradiated by infrared rays .However, an anatase TiO2 powder formed after the heat treatment of the dried gel in a temperature range from 300℃to 500℃.Under the vacuum drying and with the calcined time below 3hours ,the anatase phase was gained .As well as with the increase of gelatinizing time, the anatase TiO2 powder was obtained.展开更多
文摘The iron doping titanium dioxide was prepared by sol-gel,step precipitation,co-precipitation and immersion methods,respectively.The photocatalytic activities of these prepared samples were evaluated in X-3B dispersion irradiated under UV.The experimental results showed that the immersion method,especially using the nano TiO2 as immersion matrix,greatly enhanced the photocatalytic activity.One fold enhancement in photocatalytic activity was observed in the case of the sample prepared by immersion doping method.This may be attributed to the nano-size effect,the irreversible hole trapper in non-saturated bonding field of Fe3＋ and larger lattice strain.
文摘Nanosized TiO2 powder with anatase and rutile structures was synthesized by a sol gel method using TiCl4 ethanol solution as a precursor.The grain size ofTiO2 powder was about 63nm after the precursor was calcined at 600℃for 2 hours .The experimental techniques of XRD,TEM and Particle Distribution were used to characterize the synthesized specimens. Various special effects were investigated for their contribution to crystal structure and the size of TiO2 powder .Theformation of anatase as well as the rutile phase of TiO2 was indicted from the XRD when the reaction temperature was above 30℃and when the sol was irradiated by infrared rays .However, an anatase TiO2 powder formed after the heat treatment of the dried gel in a temperature range from 300℃to 500℃.Under the vacuum drying and with the calcined time below 3hours ,the anatase phase was gained .As well as with the increase of gelatinizing time, the anatase TiO2 powder was obtained.
