Column Adsorption Studies for the Removal of Cr(VI) Ions by Ethylamine Modified Chitosan Carbonized Rice Husk Composite Beads with Modelling and Optimization

Table 3

Model summary statistics for percentage removal of Cr(VI) using EAM-CCRCBs.

Source	Standard deviation	𝑅^2	Adj 𝑅^2	Predicted 𝑅^2	Press	Comments
Linear	7.26	0.8050	0.7684	0.6944	1322.16
2F1	7.75	0.8194	0.7360	0.6138	1671.08
Quadratic	3.28	0.9751	0.9527	0.7936	893.29	Suggested
Cubic	3.7	0.9998	0.9994	0.9811	8.96	Aliased