Preparation and Application of Sustained-Release Potassium Ferrate(VI)

Figure 2

SEM images of Fe₇₀, Fe₆₀, K₂FeO₄, and diatomite samples ((a) K₂FeO₄; (b) diatomite; (c) F₆₀; and (d) F₇₀).

(a)

(b)

(c)

(d)