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(a) Pseudo-first-order model, (b) Pseudo-second-order model, and (c) Intra-particle diffusion model of Cr(VI) adsorption at 10, 50, and 100 mg/L: W = 0.2 g, T = 30 °C, t = 4 h, pH = 2. (d) Langmuir and Freundlich isotherm model, (e) Temkin isotherm model of Cr(VI) adsorption onto CKB at 20, 30, and 40 °C, respectively, with the initial concentration of Cr(VI) at 10, 20, 40, 60, 80, 100, 150, and 200 mg/L: W = 0.2 g, t = 4 h, pH = 2.
