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Adsorption kinetics of MB on OOP at pH 7 and at a temperature of 20 °C. The adsorbent mass was kept at 1 g L−1 while the MB concentration varied from 5 to 460 mg L−1; 5 (black), 10 (red), 20 (blue), 50 (green), 100 (pink), 200 (yellow), and 460 mg L−1 (grey).
