1. Co3O4 nanocrystals on graphene oxide as a synergistic catalyst for degradation of Orange II in water by advanced oxidation technology based on sulfate radicals
- Author
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Shi, Penghui, Su, Ruijing, Wan, Fengzhi, Zhu, Mincong, Li, Dengxin, and Xu, Shihong
- Subjects
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NANOCRYSTALS , *GRAPHENE , *COBALT oxides , *NANOCOMPOSITE materials , *X-ray photoelectron spectroscopy , *PHOTODEGRADATION , *PHOTOCATALYSIS , *WATER , *OXIDATION , *SULFATES , *RADICALS (Chemistry) - Abstract
Abstract: Graphene oxide and cobalt oxide nanocomposites (Co3O4/GO) are fabricated in situ as heterogeneous catalysts by the decomposition of cobalt nitrate through heat and crystal growth of Co3O4 on the surface of GO sheets in 1-hexanol solvent. The Co3O4/GO catalyst is characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM). Results show that the Co3O4/GO catalysts are large GO sheets decorated homogenously with well-dispersed Co3O4 nanoparticles. Although Co3O4 or GO alone exhibit little catalytic activity, their hybrid (Co3O4/GO) exhibits an unexpectedly high catalytic activity in the degradation of Orange II in water by advanced oxidation technology based on sulfate radicals, and 100% decomposition can be achieved in 6min. These phenomena suggest a synergistic catalytic activity of Co3O4 and GO in the hybrid. [Copyright &y& Elsevier]
- Published
- 2012
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