LaFeO 3 nanocrystals were synthesized by both citric acid and microemulsion methods. Their structures, sizes and morphologies were investigated by XRD and TEM. All the LaFeO 3 obtained showed catalytic activity in decolorization of some organic dyes under irradiation of mercury lamp.
Pervoskite type oxides LaCoO 3 was prepared by citrate method with the granula of 20 nm-30 nm. With a fluorescent Hg lamp or sunlight as irradiator, the degradation experiments of various water soluble dyes were carried out in the suspension system of LaCoO 3 . The results show that the pervoskite type oxide LaCoO 3 has good photocatalytic activity.Studied by X ray photoelectron spectroscopy and photoacoustic spectra, its photocatalytic activity is found to be related with factors such as the d electron structure of ion Co 3+ ,Co—O binding energy and adsorbed oxygen on the surface etc.
