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 1

Ranges and level of studied parameters in order to design the experiments.

Parameter name	Unit	Symbols	Low	High
Contact time	Min	A	10	90
pH	—	B	3	11
Adsorbent dosage	g	C	0.25	12.25
Initial concentration	Mg/L	D	100	500