Fig. 1. (Color online) Schematic diagram of the composite route at FeOOH@PDI.

Fig. 2. (Color online) (a) FeOOH@PDI, XRD patterns of PDI and FeOOH. (b) Zeta potential for FeOOH, PDI, FeOOH@PDI. (c) 20% FeOOH@PDI, PDI, and FeOOH infrared spectra.

Fig. 3. (Color online) TEM spectrum of (a) 20% FeOOH@PDI and TEM-EDS image of (b)−(f) 20% FeOOH@PDI. (g) PDI and 20% FeOOH@PDI C 1s spectrum.

Fig. 4. SEM images of (a) FeOOH, (b) PDI, and (c) 20% FeOOH@PDI.

Fig. 5. (Color online) (a) and (b) Degradation effects and degradation rate constants of BPA by PDI and FeOOH@PDI. (c) and (d) Degradation effects of different Fenton reaction modes on BPA and degradation rate constants. (e) 20% FeOOH@PDI degradation effect and degradation rate constant of different organic pollutants. (f) Mineralization rate of organic pollutants.

Fig. 6. (Color online) Photo-Fenton degradation of 20 ppm BPA by 20% FeOOH@PDI under different ions and humic acid interference.

Fig. 7. (Color online) (a) Transient photocurrent, (b) electrochemical impedance spectroscopy, (c) steady-state fluorescence (PL), and (d) surface photovoltage (SPV) of PDI and FeOOH@PDI.

Fig. 8. (Color online) (a) Cyclic stability of 20% FeOOH@PDI, (b) valence states, and proportions of Fe on FeOOH@PDI surface before and after the reaction.