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Table 1
The coded levels of the independent variables
Variables
.
Factors
.
Levels
.
−1 (low)
.
0 (middle)
.
1 (high)
.
pH
X
1
3
5.5
8
Temperature (°C)
X
2
25
35
45
CBZ initial concentration (mgL
−1
)
X
3
5
12.5
20
Adsorbent dosage (mg)
X
4
20
30
40
Variables
.
Factors
.
Levels
.
−1 (low)
.
0 (middle)
.
1 (high)
.
pH
X
1
3
5.5
8
Temperature (°C)
X
2
25
35
45
CBZ initial concentration (mgL
−1
)
X
3
5
12.5
20
Adsorbent dosage (mg)
X
4
20
30
40
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