The BiOCl powders prepared by the hydrolysis method were investigated with the X-ray diffractometry（XRD）,scanning electron microscopy（SEM） and differential thermal analysis（TG？DTA）.The results show that the powders are of the tetragonal primitive crystal structure,composed of homogeneous particles of fine ferrite plates,and stable in the temperature range of 40？600 ℃.In addition,the photocatalytic activity of BiOCl powders was evaluated by methyl orange（MO） in aqueous solution illuminated by xenon-lamp,and the effect of the BiOCl amount on the photocatalytic activity was investigated.Moreover,the photocatalytic properties of BiOCl and TiO2-P25 were also compared.The results show that the favorite amount of BiOCl powders is 1.0 g/L for the MO degradation,and the photocatalytic activity of the BiOCl catalyst is comparable to the TiO2-P25 catalyst under the same experiment condition.
