BiOI synthetized by template and its degradation of organic pollutants under visible light

BiOI nano-plates were synthetized via using surfactants Cetyl pyridine sulfuric acid(CPSA)as templates by the method of hydrothermal. X-ray diffraction(XRD), scanning electron microscope(SEM), transmission electron microscopy(TEM), specific surface area, pore size analyzer(BET)and ultraviolet-visible absorption spectral reflection(UV-Vis) were employed to characterize the catalysts. Under visible irradiation(λ>420nm), BiOI was used to degrade dye Rhodamine B(RhB)and 4-Dichlorophenol(4-CP), which were degraded totally after illuminating 4h and 20h, respectively. Electronic spin capture technology(EPR)and contrast tests by adding scavengers of ·OH, O2- and h+ were employed to prove the oxidation process mainly involved hole direct oxidation. In addition, the changes of infrared spectrometry(IR)and total organic carbon(TOC)were measured, and TOC decreased 90% after lighting 20h.