Interactions between Phosphoric/Tannic Acid and Different Forms of FeOOH

Figure 3

X-ray diffraction patterns of different forms of FeOOH. ◆: -FeOOH; ▼: -FeOOH; ●: -FeOOH; ■: -FeOOH.

(a)

(b)

(c)

(d)