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Table 1 Levels of factors applied for the preparation of DGP active carbon

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

Factor

Low level (− 1)

High level (+ 1)

[Activating agent] (M)

1

5

Activation time (min)

30

90

Activation agent type

H3PO4

NaOH