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

Figure 4

Scanning electron microscopy of the external and internal part of untreated rice husk: (a) external part (×200), (b) external part (×500), (c) external part (×1200), and (d) internal part (×200).

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(b)

(c)

(d)