Efficient Removal of 2,4-DCP by Nano Zero-Valent Iron-Reduced Graphene Oxide: Statistical Modeling and Process Optimization Using RSM-BBD Approach

Table 1

Independent variables and experimental level in this study.

Independent variable	Factors	Experimental level
		Low (-1)	Middle (0)	High (+1)
Dosage (g/L)	A	0.5	1.0	1.5
Concentration (mg/L)	B	10	25	40
Reaction time (min)	C	1	5.5	10
pH	D	3	7	11