Gaseous La/Eu/Er Permeation Of TiO₂ And Photocatalytic Properties

The TiO2 semiconductor has excellent photocatalytic performance, and is widely used in wastewater treatment. But the wide energy gap and the recombination of e- /h + pairs greatly decrease the photocatalysis efficiency of TiO 2 . So TiO 2 must be modified to improve its photocatalytic performance.In this experiment, the anatase TiO2 was the study object as the photo catalyst to decolorized Methyl Orange(MO) and the effects of pH value, initial solution concentration and calcined condition on photocatalytic oxidation MO of unpermeated TiO2 were studied. And the rare earth permeation techniques of TiO 2 are analyzed. The effect of the permeation technics of TiO 2 with LaCl3, EuCl 3 and ErCl3 on photocatalytic properties and the mechanism of decolorization for MO were elementarily studied. The main contents of experiment were as follow:The results showed that the effect of pH value on the rate of MO decolorization was obvious, the rate of MO decolorization in the acid solution was bigger than that in the alkaline and neutral solution. The bigger the intial solution concentration was, the more the MO reaction amout in unit time, but the rate of MO decolorization reduced. When the unpermeation TiO2 calcined at 600℃, the photocatalytic property declined.Non-detection of lanthanon compounds in the XRD detection results showed that the content have ounce; XPS detection results reviewed that La, Eu and Er elements were the tervalent ions in TiO 2 , with the most Ti 4+ and a little of Ti3+ on the surface of TiO 2 ; The responding photocatalytic wavelength of LaCl3, EuCl 3 , ErCl 3 permeated to TiO2 powder had intensity adsorbance in visible range, owing to the reduction of originate energy that electron transition needed. Rare earth ions permeated in TiO2 had higher photocatalytic activity and they actted as sensible and assitant catalyst; FT-IR detection results reviewed that MO was decomposed in conjugatedπbond structure of nitrogen in the acid.The photocatalytic activities of permeation TiO2 were measured and the results reviewed that the photocatalytic property was intensively improved, and the degree was obviously affected by the condition of permeation. When the...