Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic Studies

Figure 5

Scanning electron microscopy of rice husk treated with NaOH: (a) and (b) external part (×200), (c) external part (×1200), and (d) internal part (×200).

(a)

(b)

(c)

(d)