Preparation And Photocatalytic Property Of Pyrochlore Bi_2ti_2o_7 And (bi, La)_2ti_2o_7 Films

摘要

Dopant-free Bi_2Ti_2O_7 thin films with pyrochlore structure and La-doped bismuth titanate thin films have been fabricated by means of chemical solution decomposition, and characterized by X-ray diffraction, atomic force microscopy, scanning electron microscopy and UV-Vis spectrophotometry in this study. Their photocatalytic activities have been evaluated by photodegrading methyl orange solution, and the optimum processing parameters for the highest photocatalytic activity have been found. Moreover, the effects of La-doping on the phase transformation and the photocalalytic activity have been studied. It has been deduced from the experiment result that substituted La~(3+) ions can act as a stabilizer of Aurivillus phase BLT and a grain-growth inhibitor in BLT thin films.