Abstract: The Co3 O4/NiO precursor sample was synthesized by hydrothermal method using CoCl 2 · 6H2 O, NiCl2 · 6H2 O and hexamethylene tetramine as raw materials .After the heat treatment , the Co3O4/NiO sample was obtained.The Co3O4/NiO sample with different morphologies was prepared by changing calcination temperature . The structures and morphologies of nano-petal Co3 O4/NiO were investigated by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM).The results indicate after the heat treatment at 400 ℃, the asobtained nano-petal Co 3 O4/NiO have porous surfaces with a thickness of about 50 nm.Comparing the degradation efficiency of PB under UV irradiation with nano-petal Co3 O4/NiO, Co3 O4 , NiO and without any catalyst , nano-petal Co3 O4/NiO photocatalysts possess higher photocatalytic efficiency .The results show that after 180 minutes under UV irradiation, the degradation rate of PB is close to 95%.

Key words: Co3 O4/NiO;nano-petal;photocatalysis;Pyronine B