IWA Publishing

Table 2

Model summary statistics for adsorption capacity of biochar for VR3BS dye

Source	Sequential p-value	Lack of fit p-value	R²	Adjusted R²	Predicted R²	Comment
Linear	<0.0001	0.0691	0.9283	0.9169	0.9066
2FI	0.8188	0.0470	0.9377	0.9049	0.8952
Quadratic	<0.0001	0.4867	0.9861	0.9731	0.9492	Suggested
Cubic	0.5839	0.3023	0.9930	0.9710	0.6693	Aliased

Source	Sequential p-value	Lack of fit p-value	R²	Adjusted R²	Predicted R²	Comment
Linear	<0.0001	0.0691	0.9283	0.9169	0.9066
2FI	0.8188	0.0470	0.9377	0.9049	0.8952
Quadratic	<0.0001	0.4867	0.9861	0.9731	0.9492	Suggested
Cubic	0.5839	0.3023	0.9930	0.9710	0.6693	Aliased