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

Table 4

Multiple regression consequence of the terms for the quadratic model.

Factor	Coefficient estimate	Effect	Sum of squares	PC
Intercept	71.84
dosage	23.21	27.30	6463.52	32.77
concentration	-10.64	5.74	1358.94	6.89
reaction time	17.88	16.20	3836.33	19.45
pH	-18.63	17.59	4163.43	21.11
	-1.0000	0.05	4.00	0.02
	2.87	0.42	32.95	0.17
	4.88	1.21	95.26	0.48
	-8.06	3.29	259.69	1.32
	0.7825	0.03	2.45	0.01
	-6.23	1.97	155.13	0.79
	-11.29	6.46	826.20	4.19
	-8.53	3.69	472.34	2.39
	-16.23	13.35	1708.82	8.66
	-7.31	2.71	346.70	1.76