Table 1. The L₁₆(4⁵) orthogonal array for the experimental design.

ID	Temp.a (°C)	Init. Conc. (mg L−1)	Dosage (g)	pH	Agita. Speed (rpm)	Adsorp. Capacity
						(mg g−1)
1	5	200	0.2	5.5	0	30.67
2	5	500	0.5	6.5	50	38.95
3	5	700	0.7	7.5	100	40.39
4	5	1000	1.0	8.5	150	41.38
5	15	200	0.5	7.5	150	14.81
6	15	500	0.2	8.5	100	100.1
7	15	700	1.0	5.5	50	22.55
8	15	1000	0.7	6.5	0	54.12
9	25	200	0.7	8.5	50	11.33
10	25	500	1.0	7.5	0	19.32
11	25	700	0.2	6.5	100	139.1
12	25	1000	0.5	5.5	150	82.78
13	35	200	1.0	6.5	100	8.41
14	35	500	0.7	5.5	150	25.67
15	35	700	0.5	8.5	0	55.66
16	35	1000	0.2	7.5	50	205.0

^aTemp., Init. Conc., Agita. Speed, and Adsorp. Capacity denote the adsoption temperature, initial concentrations of emulsified oil, speed of agitation, and the adsoption capacity under the designed conditions, respectively.