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Table 2 Experimental design matrix and responses for the preparation of Dialium Guineense pods activated carbon (DGPAC)

From: Screening of factors that influence the preparation of Dialium guineense pods active carbon for use in methylene blue adsorption: a full factorial experimental design

Run order

[Activating agent] M

Activation time (min)

Activating agent

Yield (%)

Adsorption capacity (mg/g)

1

1

90

NaOH

32.40

4.607

2

5

90

H3PO4

23.45

5.513

3

5

30

NaOH

26.00

9.628

4

5

30

H3PO4

27.99

7.003

5

3

60

NaOH

27.26

4.550

6

1

30

NaOH

41.24

2.920

7

1

90

H3PO4

32.74

2.700

8

5

90

NaOH

25.14

9.534

9

1

30

H3PO4

44.58

2.365

10

3

60

H3PO4

30.72

2.090