In this work, we have successfully synthesized pure-phase bismuth ferrite (BiFeO3) particles through chemical co-precipitation route with composite precipitants. The TG-DSC suggests select 600 degrees C as calcination temperature. The X-ray diffraction pattern confirms the perovskite structure of BFO. The scanning electron microscope (SEM) image shows that the particle size of BFO lies between 100 and 150 nm. UV-Vis diffuse reflectance spectra shows the band gap energy of the BFO samples is less than 2.2 eV. In addition, methyl orange was chosen as a dye water pollution to evaluate its degradation by as-synthesized BFO particles under visible light irradiation. The photocatalysis results reveal that the degradation efficiency of 97.06% to methyl orange occurred with BFO particles prepared with NH3 center dot H2O/NH4HCO3 equal to 1:1 under visible light irradiation.