Investigation of Fe-Doped Graphitic Carbon Nitride-Silver Tungstate as a Ternary Visible Light Active Photocatalyst

Table 2

ANOVA table for degradation of RhB by Fe-g-C₃N₄-Ag₂WO₄

Source	Sum of squares	Df	Mean square	F value	value prob > F
Model	5555.55	14	396.83	62.49	<0.0001	Significant
A-pH	1290.67	1	1290.67	203.25	<0.0001
B-catalyst dose	1232.67	1	1232.67	194.12	<0.0001
C-oxidant dose	192.67	1	192.67	30.34	<0.0001
D-time	1148.17	1	1148.17	180.81	<0.0001
AB	2.25	1	2.25	0.35	0.5605
AC	36.00	1	36.00	5.67	0.0310
AD	30.25	1	30.25	4.76	0.0454
BC	0.000	1	0.000	0.000	1.0000
BD	156.25	1	156.25	24.61	0.0002
CD	4.00	1	4.00	0.63	0.4398
A^2	1211.44	1	1211.44	190.78	<0.0001
B^2	74.30	1	74.30	11.70	0.0038
C^2	390.01	1	390.01	61.42	<0.0001
D^2	141.44	1	141.44	22.27	0.0003
Residual	95.25	15	6.35			Not significant$
Lack of fit	81.92	10	8.19	3.07	0.1136
Pure error	13.33	5	2.67
Cor total	5650.80	29
SD	2.52		R-squared		0.9831
Mean	77.20		Adj R-squared		0.9674
C.V.	3.26		Pred R-squared		0.9131
Press	491.04		Adeq precision		27.897

Significant model terms. $Nonsignificant lack of fit is good. We want the model to fit.