Statistical Modeling and Kinetic Studies on the Adsorption of Reactive Red 2 by a Low-Cost Adsorbent: Grape Waste-Based Activated Carbon Using Sulfuric Acid Activator-Assisted Thermal Activation

Table 3

Statistical parameters and ANOVA results using Design-Expert 11.0.0 for the studied variables.

Source	Sum of squares	Df	Mean square	value	value
Model	85022.46	14	6073.03	216.67	<0.0001	Significant
	10906.21	1	10906.21	389.11	<0.0001	Significant
	63.81	1	63.81	2.28	0.1363
	16238.42	1	16238.42	579.35	<0.0001	Significant
	10637.74	1	10637.74	379.53	<0.0001	Significant
AB	1.96	1	1.96	0.0699	0.7923
AC	6761.63	1	6761.63	241.24	<0.0001	Significant
AD	190.80	1	190.80	6.81	0.0113
BC	0.3502	1	0.3502	0.0125	0.9114
BD	27.45	1	27.45	0.9794	0.3261
CD	20.15	1	20.15	0.7189	0.3997
	5.97	1	5.97	0.2128	0.6461
	21.68	1	21.68	0.7734	0.3825
	221.68	1	221.68	7.91	0.0066
	710.92	1	710.92	25.36	<0.0001	Significant
Residual	1765.81	63	28.03
Lack of fit	269.62	10	26.96	0.9551
Pure error	1496.19	53	28.23	0.4925
Cor total	86788.27	77