Adsorptive Removal of Methylene Blue and Crystal Violet onto Micro-Mesoporous Zr₃O/Activated Carbon Composite: A Joint Experimental and Statistical Modeling Considerations

Table 6

Analysis of variance and coefficients of determination.

	Sum of squares	Degrees of freedom	Mean square	Fobs	value
MB adsorption onto Zr3O/AC
Regression	1.8019	9	0.2002	189.4786	<0.0001
Residue	0.0933	8	0.0117
Lack of fit	0.0880	3	0.0293	27.7681	0.00152
Error	0.0053	5	0.0011
Total	1.8952	17
R^2	0.951
R^2A	0.895
CV adsorption onto Zr3O/AC
Regression	348.6312	9	38.7368	6027.5101	<0.0001
Residue	8.0777	8	1.0097
Lack of fit	8.0455	3	2.6818	417.2990	<0.0001
Error	0.0321	5	0.0064
Total	356.7088	17
R^2	0.977
R^2A	0.952