Removal of Cd(II) and Cu(II) from Aqueous Solution by Na⁺-Modified Pisha Sandstone

Figure 5

Effect of concentration on the adsorption capacity of PS and Na-PS towards Cd(II) (a and b) and Cu(II) (c and d) ions. Note: PS means Pisha sandstone; Na-PS means Pisha sandstone modified with Na⁺.

(a)

(b)

(c)

(d)