Abstract
A kind of heterogeneous catalysts is fabricated in situ by the decomposition of cobalt nitrate through heat and crystal growth of cobalt oxide (Co3O4) on the surface of expanded graphite (EG) in 1-hexanol solvent. The Co3O4/EG catalyst can activate peroxymonosulfate for the degradation of Orange II in water. The test results of X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy (Raman), scanning electron microscopy, and high resolution transmission electron microscopy show that the Co3O4/EG catalysts are EG decorated homogenously with well-dispersed Co3O4 nanoparticles. The Co3O4/EG catalysts exhibit an unexpectedly high catalytic activity than Co3O4 or EG alone in the degradation of Orange II in water by advanced oxidation processes based on sulfate radicals, and 100% decomposition can be achieved in 8 min. These phenomena suggest that there is a synergistic catalytic activity between Co3O4 and EG.
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