Cr(VI) Adsorption on Red Mud Modified by Lanthanum: Performance, Kinetics and Mechanisms
Fig 1
Effects of some operational conditions on Cr(VI) removal and adsorption capacity.
(a) The effect of dose (temperature = 25°C, pH = 7, Cr(VI) concentration = 40 mg/L, time = 3 h); (b) The effect of temperature (dosage = 4 g/L, pH = 7, Cr(VI) concentration = 40 mg/L, time = 3 h); (c) The effect of pH (dosage = 4 g/L, temperature = 25°C, Cr(VI) concentration = 40 mg/L, time = 3 h); (d) The effect of initial Cr(VI) concentration (dosage = 4 g/L, temperature = 25°C, pH = 7, time = 3 h); (e) The effect of contact time (dosage = 4 g/L, temperature = 25°C, pH = 7, Cr(VI) concentration = 40 mg/L).