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Discoloration of the RhB solution by the application of the activated carbon obtained by the pyrolysis of the straw pellet and chemical activation with KOH (the sample to KOH mass ratio of 1:2). The numbered pictures represent various dosages of activated carbon: no. 2–6 depict 2.7, 4.1, 11.2, 15.3 and 20.6 mg, respectively, used for sorption of 30 mg/dm3 of Rhodamine B at 25 °C.
