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Table 2

Experimental range and levels of independent variables

Independent variablesCodeReal values of the coded levels
−1.682− 10+1+1.682
Concentration of H2O2 (M) X1 0.132 0.2 0.3 0.4 0.468 
Dosage of GAC (g/L) X2 39.54 60 90 120 140.46 
Concentration of IPA (M) X3 0.038 0.18 0.39 0.60 0.743 
Independent variablesCodeReal values of the coded levels
−1.682− 10+1+1.682
Concentration of H2O2 (M) X1 0.132 0.2 0.3 0.4 0.468 
Dosage of GAC (g/L) X2 39.54 60 90 120 140.46 
Concentration of IPA (M) X3 0.038 0.18 0.39 0.60 0.743 
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