Removal of Pb(II) from Aqueous Solutions with Manganese Oxide-Modified Diatomite

Figure 2

SEM images of Mn/diatomite samples prepared at different KMnO₄/HCl molar ratios: (a, b) 1 : 1; (c, d) 1 : 2; (e, f) 1 : 4 (experimental conditions: hydrothermal time and temperature are 16 h and 80°C, respectively).

(a)

(b)

(c)

(d)

(e)

(f)