Table 1 The actual and coded values of independent variables.

From: 4-Chlorophenol adsorption from water solutions by activated carbon functionalized with amine groups: response surface method and artificial neural networks

Variables

Unit

Range and level

 − α (− 1)

 + α (+ 1)

pH

–

3

11

Contact time (X3),

min

10

60

Adsorbent dosage

g/L

0.1

1

4-Chlorophenol concentration

Mg/L

20

200

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