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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