The Co3O4/CN-xCeO2 (x=0, 3, 6) composites for photocatalytic degradation of HCHO under visible-light irradiation: Performance and characterization

摘要

The Co3O4/CN-xCeO2 (x = 0, 3, 6) composites for enhanced photocatalytic degradation of formaldehyde (HCHO) performance were prepared by hydrothermal-calcination method. The structure, microstructure and surface functional groups of samples were investigated by using the X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy and Fourier transform infrared spectrometer, and the degradation mechanism of Co3O4/CN-3CeO2 was also discussed this paper. The results showed that the Co3O4/CN-3CeO2 sample could degrade 91.5 of HCHO within 9 h which was 190 higher than that of the CN, and maintained excellent performance for 24 h. The sample was in the form of irregular block-based flakes and particles, the specific surface area was 111.92 m(2)/g which was 2.5 times than that of the CN sample. The sample was composed of CN and Co3O4 phases, existed O-H, N-H, C=O, C-N, Co-O, Ce-O functional group and mesoporous structure with pore size distribution of 2 to 20 nm.