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Table 2

BBD matrix with four independent variables (expressed coded) and two response (qe ± SD and R% ± SD)

Run no.Initial pH of solution (pH)Initial dye concentration (C0: mg/L)Adsorbent dosage (d: g/L)Temperature (T: °C)Adsorption efficiency
x1 (coded)x2 (coded)x3 (coded)x4 (coded)R%qe (mg/g)
−1 −1 76.48 ± 0.02 34.8 ± 0.02 
+1 −1 98.62 ± 0.01 44.8 ± 0.01 
−1 46.02 ± 0.01 126.0 ± 0.01 
+1 82.72 ± 0.05 226.0 ± 0.05 
−1 −1 53.98 ± 0.02 472.3 ± 0.02 
−1 88.57 ± 0.02 70.2 ± 0.02 
−1 70.38 ± 0.06 616.0 ± 0.06 
80.25 ± 0.02 77.5 ± 0.02 
−1 −1 37.82 ± 0.01 60.2 ± 0.01 
10 −1 76.45 ± 0.02 122.0 ± 0.02 
11 −1 63.79 ± 0.03 101.0 ± 0.03 
12 80.43 ± 0.03 128.0 ± 0.03 
13 −1 −1 72.32 ± 0.01 181.0 ± 0.01 
14 −1 59.46 ± 0.02 892.0 ± 0.02 
15 −1 97.76 ± 0.02 24.4 ± 0.02 
16 82.93 ± 0.01 124.0 ± 0.01 
17 −1 −1 41.12 ± 0.02 360.0 ± 0.02 
18 −1 98.52 ± 0.06 862.0 ± 0.06 
19 −1 59.77 ± 0.03 60.0 ± 0.03 
20 92.64 ± 0.02 81.1 ± 0.02 
21 −1 −1 95.48 ± 0.03 42.0 ± 0.03 
22 −1 83.25 ± 0.04 170.0 ± 0.04 
23 −1 93.04 ± 0.01 46.0 ± 0.01 
24 61.39 ± 0.03 240.0 ± 0.03 
25 73.30 ± 0.05 115.0 ± 0.05 
26 72.20 ± 0.04 115.0 ± 0.04 
27 73.30 ± 0.01 34.8 ± 0.01 
Run no.Initial pH of solution (pH)Initial dye concentration (C0: mg/L)Adsorbent dosage (d: g/L)Temperature (T: °C)Adsorption efficiency
x1 (coded)x2 (coded)x3 (coded)x4 (coded)R%qe (mg/g)
−1 −1 76.48 ± 0.02 34.8 ± 0.02 
+1 −1 98.62 ± 0.01 44.8 ± 0.01 
−1 46.02 ± 0.01 126.0 ± 0.01 
+1 82.72 ± 0.05 226.0 ± 0.05 
−1 −1 53.98 ± 0.02 472.3 ± 0.02 
−1 88.57 ± 0.02 70.2 ± 0.02 
−1 70.38 ± 0.06 616.0 ± 0.06 
80.25 ± 0.02 77.5 ± 0.02 
−1 −1 37.82 ± 0.01 60.2 ± 0.01 
10 −1 76.45 ± 0.02 122.0 ± 0.02 
11 −1 63.79 ± 0.03 101.0 ± 0.03 
12 80.43 ± 0.03 128.0 ± 0.03 
13 −1 −1 72.32 ± 0.01 181.0 ± 0.01 
14 −1 59.46 ± 0.02 892.0 ± 0.02 
15 −1 97.76 ± 0.02 24.4 ± 0.02 
16 82.93 ± 0.01 124.0 ± 0.01 
17 −1 −1 41.12 ± 0.02 360.0 ± 0.02 
18 −1 98.52 ± 0.06 862.0 ± 0.06 
19 −1 59.77 ± 0.03 60.0 ± 0.03 
20 92.64 ± 0.02 81.1 ± 0.02 
21 −1 −1 95.48 ± 0.03 42.0 ± 0.03 
22 −1 83.25 ± 0.04 170.0 ± 0.04 
23 −1 93.04 ± 0.01 46.0 ± 0.01 
24 61.39 ± 0.03 240.0 ± 0.03 
25 73.30 ± 0.05 115.0 ± 0.05 
26 72.20 ± 0.04 115.0 ± 0.04 
27 73.30 ± 0.01 34.8 ± 0.01 
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