Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin

Figure 4

Influence of pH on the adsorption capacities of Cr(III) (a) or Cr(VI) (b) onto kaolin. Note: the lowercase letters in figure above are the 5% significant level by using LSD method under the same Cr treatment, but under different pH (adsorption conditions:  mg·L⁻¹ for Cr(III),  mg·L⁻¹ for Cr(VI),  mL,  g, temperature = 25°C, and equilibrium time = 120 min).

(a)

(b)