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[Initial Cr(VI) concentration (mg L-1): (●) 20, (△) 60, (◆) 100, (+) 150, (■) 200, (◇) 250, (✳) 400, (▲) 800, (○) 1000;—pseudo-second-order model prediction]. CLB concentration: 1 g L-1; pH = 1.5±0.1; temperature = 28±2°C.
