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1 材料与方法
1.1 实验材料及试剂
Table 1 Basic chemical composition of attapulgite
Table 1 Basic chemical composition of attapulgite
% | ||||
SiO2 | Al2O3 | K2O | Mg2O | Fe2O3 |
55.62 | 9.71 | 0.95 | 9.92 | 1.99 |
1.2 实验仪器
1.3 实验方法
1.3.1 催化剂的制备
1.3.2 废水的催化氧化实验方法
2 结果与讨论
2.1 凹凸棒土(ATP)与活性炭的比例对COD去除率的影响
Fig. 1 Effect of proportion of ATP and activated carbon on COD and color removal rate
Fig. 1 Effect of proportion of ATP and activated carbon on COD and color removal rate
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2.2 pH值的影响
Fig. 2 Effect of pH on COD and color removal rate
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2.3 H2O2加入量的影响
H2O2+⋅OH→H2O+HO2⋅ | (1) |
HO2⋅+⋅OH→H2O+O2 | (2) |
Fig. 3 Effect of H2O2 dosage on COD and color removal rate
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2.4 催化剂加入量的影响
Cu2++H2O2→Cu++HO2⋅+H+ | (3) |
Cu++H2O2→Cu2++⋅OH+OH− | (4) |
HO2+H2O2→O2+⋅OH | (5) |
Cu++⋅OH→Cu2++OH− | (6) |
Fig. 4 Effect of catalyst dosage on COD and color removal rate
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2.5 正交实验优化
2.5.1 正交实验结果分析
Table 2 Results of orthogonal experiment and range analysis
Table 2 Results of orthogonal experiment and range analysis
序号 | (A)催化剂载体比例 | (B)pH | (C)c/c0 | (D)时间/min | COD去除率/% |
1 | 2:1 | 4 | 0.5 | 60 | 78.44 |
2 | 2:1 | 5 | 1 | 90 | 77.57 |
3 | 2:1 | 6 | 2 | 120 | 84.95 |
4 | 1:1 | 4 | 1 | 120 | 82.23 |
5 | 1:1 | 5 | 2 | 60 | 75.81 |
6 | 1:1 | 6 | 0.5 | 90 | 82.64 |
7 | 1:2 | 4 | 2 | 90 | 92.35 |
8 | 1:2 | 5 | 0.5 | 120 | 80.97 |
9 | 1:2 | 6 | 1 | 60 | 60.72 |
k1 | 80.3 | 84.3 | 80.7 | 71.7 | |
k2 | 80.2 | 78.1 | 73.5 | 84.2 | |
k3 | 78.0 | 76.1 | 84.4 | 82.7 | |
R | 2.3 | 8.2 | 10.9 | 12.5 | |
Q | A1 | B1 | C3 | D2 |
2.5.2 正交实验方差分析
Table 3 Variance analysis of orthogonal experimental results
Table 3 Variance analysis of orthogonal experimental results
方差来源 | 偏差平方和 | 自由度 | F比 | 临界值 | 显著性 |
(A)催化剂载体比例 | 10.29 | 2 | 0.07 | 1.90 | 不显著 |
(B)pH | 110.63 | 2 | 0.76 | 1.90 | 不显著 |
(C)c/cO | 183.11 | 2 | 1.25 | 1.90 | 不显著 |
(D)时间 | 281.49 | 2 | 1.92 | 1.90 | 显著 |
误差 | 585.52 | 8 |
2.5.3 催化剂金属离子溶出
Fig. 5 Leaching of copper and manganese ions in catalyst
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2.6 催化剂的表征
2.6.1 SEM分析
Fig. 6 SEM images of attapulgite and catalyst
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2.6.2 XRD图谱分析
Fig. 7 XRD patterns of attapulgite and the catalyst
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2.7 催化剂的重复使用效果
Fig. 8 Effect of cycle times of catalyst on COD removal rate
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