3D hierarchical Fe-doped Bi4O5I2 microflowers as an efficient Fenton photocatalyst for tetracycline degradation over a wide pH range

•Fe-doped Bi4O5I2 microflower was prepared as theFentonphotocatalyst.•High photo-Fenton activity fortetracyclinedegradation at pH 3.0–9.0.•Synergistic effects ofphotocatalysisand Fenton reaction for tetracycline removal.•Superiority of Fe-doping results from the improved charge separation.•The photocatalyst is found to be stable and efficient for several repeated cycles.