BiOClxBr1 xcatalysts were synthesized through an alcoholysis method and characterized by X-ray difraction(XRD),transmission electron microscopy(TEM),high-resolution transmission electron microscopy(HRTEM),and difuse reflectance spectroscopy(DRS).The as-prepared photocatalysts were found to be tetragonal crystal structure and lamellar plate morphology.Their band gaps were between 3.44 and 2.83 eV.The efect of light response on the photocatalytic activity of BiOClxBr1 xwas investigated by degradation of Rhodamine B(RhB).Complete removal of RhB from water was realized under simulated sunlight irradiation for 50 min with BiOCl0.5Br0.5.Mechanism studies showed that photogenerated holes and superoxide anion radicals played important roles in RhB photodegradation.The results of chemical oxygen demand(COD)confrmed RhB mineralization.The efect of light response on the activity of BiOClxBr1 xwas further investigated under monochromatic light irradiation,and BiOCl0.5Br0.5catalyst exhibited the highest activity.Furthermore,BiOCl0.5Br0.5exhibited high stability,suggesting its practical application for the removal of RhB pollutant from water.
