Abstract: PANI/F-BiPO4 heterojunction composite photocatalyst was fabricated via a facile hydrothermal method followed by chemisorption method .The structures, morphologies , light absorption properties and surface chemical composition of the samples were studied by X-ray diffraction ( XRD ) , field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance spectrophotometer (DRS) and X-ray photoelectron spectroscopy ( XPS) .The photocatalytic activity of PANI/F-BiPO4 was investigated by degradation of RhB in the visible light .Besides , the photocatalytic mechanism was discussed .It was found that PANI/F-BiPO4 exhibited strong absorbance because of the heterostructure formed at their interface.At the same time, a built-in electric field was built due to the effective migration of carrier between PANI and F-BiPO4 , which favors the rapid separation of photogenerated holes and electrons .The results show that PANI/F-BiPO4 composite shows excellent photocatalytic activity under the visible light . The degradation rate of 40 mg/L RhB can be up to 98.7; after 4 hour of visible light irradiation .

Key words: PANI/F-BiPO4 heterojunction composite photocatalyst was fabricated via a facile hydrothermal method followed by chemisorption method .The structures, morphologies , light absorption properties and surface chemical composition of the samples were studied by X-ray diffraction ( XRD ) , field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance spectrophotometer (DRS) and X-ray photoelectron spectroscopy ( XPS) .The photocatalytic activity of PANI/F-BiPO4 was investigated by degradation of RhB in the visible light .Besides , the photocatalytic mechanism was discussed .It was found that PANI/F-BiPO4 exhibited strong absorbance because of the heterostructure formed at their interface.At the same time, a built-in electric field was built due to the effective migration of carrier between PANI and F-BiPO4 , which favors the rapid separation of photogenerated holes and electrons .The results show that PANI/F-BiPO4 composite shows excellent photocatalytic activity under the visible light . The degradation rate of 40 mg/L RhB can be up to 98.7; after 4 hour of visible light irradiation .