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International Journal of Photoenergy
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International Journal of Photoenergy
/
2012
/
Article
/
Tab 2
/
Research Article
Simultaneous Photocatalytic Reduction of Cr(VI) and Oxidation of Benzoic Acid in Aqueous N-F-Codoped TiO
2
Suspensions: Optimization and Modeling Using the Response Surface Methodology
Table 2
Analysis of variance (ANOVA) for % removal of Cr(VI).
Source
Sum of
squares
df
Mean
square
value
value
Model
12510.88
9
1390.10
1841.56
<0.0001
-TiO
2
mg L
−1
2504.00
1
2504.00
3317.23
<0.0001
-Cr/BA ratio
4710.52
1
4710.52
6240.35
<0.0001
-pH
3593.50
1
3593.50
4760.57
<0.0001
21.35
1
21.35
28.29
0.0011
2.07
1
2.07
2.74
0.1416
276.95
1
267.95
366.89
<0.0001
22.49
1
22.49
29.79
0.0009
674.33
1
674.33
893.34
<0.0001
294.43
1
294.43
390.05
<0.0001
Residual
5.28
7
0.75
Lack of fit
3.34
5
0.67
0.69
0.6829
Pure error
1.95
2
0.97