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

Table 2

Process control variables and their limits.

Variable	Unit	Notation	Limits
			−2	−1	0	1	2
Initial dye concentration	MgL^−1	𝐶0	25	50	75	100	125
Dose	gL^−1	𝐷	4	6	8	10	12
pH		pH	3	5	7	9	11
Temperature	°C	𝑇	15	25	35	45	55