Preparation of CeO₂ with different Morphologies and its Application toAastewater Treatment with Catalytic Ozonation

Taking Ce(NO₃)₃·6H₂O as cerium source, CeO₂ nanoplates, CeO₂ nanorods and CeO₂ nanotubes were prepared by 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 and reaction conditions played great role in the removal of organic compounds. It was found that the CeO₂ nanotubes showed superior catalytic activity. When 0.5g of CeO₂ nanotubes and 15mg/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 100mg/L TOC. Therefore, nano-CeO₂ as a new catalyst in catalytic ozonation technology has great prospects.