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Table 1

The coded levels of the independent variables

VariablesFactorsLevels
−1 (low)0 (middle)1 (high)
pH X1 5.5 
Temperature (°C) X2 25 35 45 
CBZ initial concentration (mgL−1X3 12.5 20 
Adsorbent dosage (mg) X4 20 30 40 
VariablesFactorsLevels
−1 (low)0 (middle)1 (high)
pH X1 5.5 
Temperature (°C) X2 25 35 45 
CBZ initial concentration (mgL−1X3 12.5 20 
Adsorbent dosage (mg) X4 20 30 40 
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