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1 实验部分
1.1 试剂与仪器
1.2 催化剂制备
1.3 甲基橙降解实验
2 结果与讨论
2.1 铜铈复合氧化物中矿物相形态
Fig. 1 Mineral phases of Cu-Ce composite oxides with different Cu/Ce ratios

2.2 铜铈复合氧化物中元素化学形态
Fig. 2 XPS spectra of Cu-Ce composite oxide

2.3 铜铈复合氧化物对甲基橙的脱色效果
Fig. 3 Decolorization of methyl orange with the addition of Cu-Ce composite oxides with different Cu/Ce ratios
Fig. 3 Decolorization of methyl orange with the addition of Cu-Ce composite oxides with different Cu/Ce ratios

Fig. 4 Decolorization of methyl orange with the addition of TBA and Cu-Ce composite oxides with different Cu/Ce ratios
Fig. 4 Decolorization of methyl orange with the addition of TBA and Cu-Ce composite oxides with different Cu/Ce ratios

2.4 投加量和pH对铜铈复合氧化物甲基橙脱色的影响
Fig. 5 Decolorization efficiency of methyl orange and the degradation kinetic constant with different amounts of oxide with Cu/Ce=1
Fig. 5 Decolorization efficiency of methyl orange and the degradation kinetic constant with different amounts of oxide with Cu/Ce=1

Fig. 6 Decolorization efficiency of methyl orange, reaction kinetic constants and concentrations of Cu and Ce at different pHs
Fig. 6 Decolorization efficiency of methyl orange, reaction kinetic constants and concentrations of Cu and Ce at different pHs

2.5 机理分析
Fig. 7 Effect of nitrogen, TBA and KBr on the catalytic decolorization of methyl orange with Cu-Ce composite oxides
Fig. 7 Effect of nitrogen, TBA and KBr on the catalytic decolorization of methyl orange with Cu-Ce composite oxides

Fig. 8 Changes of COD during the catalytic decolorization of methyl orange with Cu-Ce composite oxides
Fig. 8 Changes of COD during the catalytic decolorization of methyl orange with Cu-Ce composite oxides

Fig. 9 Recycling of Cu-Ce composite oxides

Cu++O2→O2·−
| (1) |
O·−2+Cu+2H+→H2O2
| (2) |
H2O2+Cu+→Cu3++·OH
| (3) |
Br−+Cu3+→Br·+Cu2+
| (4) |
Br−+Br·→Br2·−
| (5) |
e−+O2→O2·−
| (6) |
O2·−+H+→HO2·
| (7) |
2HO2·→H2O2+O2
| (8) |
H2O2+e−→·OH+OH−
| (9) |