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

Figure 1

Scanning electron microscope images of PS (a) and Na-PS (b) and XRD patterns (c). Note: PS means Pisha sandstone; Na-PS means Pisha sandstone modified with Na⁺.

(a)

(b)

(c)