Preparation, Characterization, and Activity Evaluation of CuO/F-TiO₂ Photocatalyst

Figure 9

Effect of ball milling time on the changes of PL spectra. (a) 6 h, (b) 3 h, (c) 12 h, (d) 24 h, (e) 1 h, (f) pure terephthalic acid.