Oxidized Renewable Materials for the Removal of Cobalt(II) and Copper(II) from Aqueous Solution Using in Batch and Fixed-Bed Column Adsorption

Table 5

Results of 2² experimental design for adsorption of Cu²⁺ and Co²⁺ on SBox adsorbent in a fixed-bed column at 25°C.

Number of experiment	Independent variable		Cu^2+		Co^2+
	1	−1	−1	0.261	0.40	0.091	0.23
2	−1	1	0.237	0.73	0.088	0.82
3	1	−1	0.554	1.50	0.224	0.68
4	1	1	0.428	1.41	0.220	1.58
5	0	0	0.316	1.61	0.203	2.12
6	0	0	0.345	1.54	0.195	1.39
7	0	0	0.347	1.67	0.192	1.71