Preparation of CeO_2 with different morphologies and its application to catalytic ozonation of lemon yellow solutions

摘要

Taking Ce(NO_3)_3-6H_2O as cerium source, CeO_2 nanosheets, CeO_2 nanorods and CeO_2 nanotubes were prepared using hydrothemal process. Characterization of chemical structure and surface properties for these materials was carried out and their efficacy in the catalytic ozonation degradation of wastewater was investigated. The results showed that the surface morphology played great role in the removal of organic compounds. It was found that the CeO_2 nanotubes showed superior catalytic activity. When 0.5 g of CeO_2 nanotubes and 15 mg/min of ozone were applied in catalytic ozonation, the mineralization rate reached 97% after 2 h treatment for 1L of model wastewater containing lemon yellow with 100 mg/LTOC.