Surface properties and photoactivity of TiO_2 treated with lectron beam

摘要

The improvement of the TiO_2-photoactivitiy by electron beam treatment (1 MeV) as a function of the absorbed radiation dose (MGy) is reported.The radiation-induced effects in the TiO_2 crystal structure,e.g.change of the Ti~(3+)/ Ti~(4+) ratio,increase of the photoactivity,etc.were investigated.Three methods were implemented in this respect: for the change of the TiO_2 crystal structure X-ray photoelectron spectroscopy and photoluminescence spectroscopy were applied.The photocatalytic activity of the EB-treated TiO_2 was tested by taking the degree of methylene blue photodegradation as a measure of the achieved effect.The obtained experimental data of all testing methods showed that in TiO_2 at an absorbed dose of 0.5 MGy optimum changes in crystal structure of the catalyst occur,resulting in the highest photocatalytic efficiencies.