Table 5. Central Composite Design of Three Different Parameters with Experimental and Predicted Percentage Yield.

initial conc. (ppm) X1	time (min) X2	temp. (°C) X3	sorption experimental for BB1 (%)	sorption predicted by RSM for BB1 (%)	sorption experimental for BO2 (%)	sorption predicted by RSM for BO2 (%)
60.00	60.00	35.00	78.50	82.15	88.75	86.16
36.21	83.78	43.91	87.47	89.85	92.40	90.30
60.00	20.00	35.00	85.86	86.10	83.10	84.70
60.00	60.00	35.00	79.11	82.15	79.50	86.10
83.80	36.20	26.08	81.85	83.50	90.10	89.20
36.20	36.20	43.90	83.62	84.10	88.60	89.50
20.00	100.0	50.00	82.50	81.81	84.20	83.10
100.00	60.00	35.00	84.23	86.85	88.70	90.80
20.00	100.0	20.00	79.25	76.40	82.50	80.20
60.00	60.00	20.00	61.25	63.54	74.50	76.50
36.20	83.80	26.08	79.25	81.30	89.25	88.80
60.00	100.0	35.00	87.95	89.35	89.25	88.85
60.00	60.00	50.00	92.58	90.40	93.80	91.70
83.80	83.80	26.08	86.25	84.30	95.70	96.90
36.200	36.20	26.08	81.25	83.30	83.20	81.18
83.78	83.78	43.91	93.75	91.50	96.60	94.80
83.78	36.20	43.91	90.12	89.30	90.20	89.10
20.00	60.00	35.00	57.25	61.06	60.50	62.30
60.00	60.00	60.23	81.51	85.65	85.60	86.90
20.00	20.00	50.00	65.42	60.27	70.20	67.30