Controllable synthesis of TiO2 phase junction and its application in photocatalytic degradation of indoor formaldehyde
The a-TiO2/r-TiO2 phase junction samples are successfully prepared by calcination method.XRD and Raman analysis show that the content of a-TiO2 and r-TiO2 in the sample is adjusted by changing the calcination time.In the experiment of photocatalytic degradation of formaldehyde,the activity of all a-TiO2/r-TiO2 phase junction samples is higher than that of pure a-TiO2 and r-TiO2 samples.The sample with 47.6%a-TiO2+52.4%r-TiO2 show the best activity.After 5 hours of light irradiation,the formaldehyde degradation rate can reach 96.9%,and the reaction rate is 13.6 and 24.5 times higher than that of pure a-TiO2 and r-TiO2 respectively.Surface photovoltage spectroscopy and photocurrent curve analysis show that the main reason for the difference in photocatalytic activity is that a-TiO2/r-TiO2 phase junction could promote the separation efficiency of photogenerated carriers,thereby improving the photocatalytic activity.
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