摘要 : Due to the large diameter and small surface, the contaminant degradation by conventional calcium peroxide (CaO_2) is slow with high dosage required. The aggregation of conventional CaO_2 also makes it difficult to operate. Nanosca... 展开 Due to the large diameter and small surface, the contaminant degradation by conventional calcium peroxide (CaO_2) is slow with high dosage required. The aggregation of conventional CaO_2 also makes it difficult to operate. Nanoscale CaO_2 was therefore synthesized and applied to remove toluene in this study. Prepared from nanoscale Ca(OH)_2 and H_2O_2 in the ratio of 1:7, the finely dispersed nanoscale CaO_2 particles were confirmed by the scanning electron microscope to be in the range of 100-200 nm in size. Compared to their non nanoscale counterparts, the synthesized nanoscale CaO_2 demonstrated a superior performance in the degradation of toluene, which could be eliminated in 3 d at pH 6. The oxidation products of toluene were analyzed to include benzyl alcohol, benzaldehyde and three cresol isomers. With the addition of 2-propanol, hydroxyl radicals were indicated as the main reactive oxygen species in the oxidation of toluene by nanoscale CaO_2. Superoxide radicals were also investigated as the marker of nanoscale CaO_2 in the solution. Our study thus provides an important insight into the application of nanoscale CaO_2 in the removal of toluene contaminants, which is significant, especially for controlling the petroleum contaminations. 收起