One-Step Synthesis of Spherical γ-Fe₂O₃ Nanopowders and the Evaluation of Their Photocatalytic Activity for Orange I Degradation

Figure 4

XRD patterns of γ-Fe₂O₃ powders prepared under the following conditions: (a) various pH values at 60°C for 6 h; (b) various reaction temperatures at pH of 6.0 for 6 h; (c) various reaction times at 60°C and pH of 6.0.

(a)

(b)

(c)