Preparation and Characterization of Chitosan/Feldspar Biohybrid as an Adsorbent: Optimization of Adsorption Process via Response Surface Modeling

Table 6

The experiment (𝐸) and the coded (𝐶) values of the independent process variables in the validation model and corresponding values of the response variable.

Exp. number	pH		Temperature (°C)		Dose (g/L)		Dye concentration (mg/L)		Adsorption (mg/g)
	𝐸	𝐶	𝐸	𝐶	𝐸	𝐶	𝐸	𝐶	Exp.	Pred.
1	4	−1.5	20	−1.5	5	−1.5	75	0	12.65	12.44
2	10	1.5	25	−1	11	1.5	100	1	4.021	4.148
3	8	0.5	40	0.5	9	0.5	100	1	2.140	2.335
4	6	0.5	30	−0.5	5	−1.5	25	−2	3.205	3.028