Single-atom iron co-catalyst for highly enhancing TiO2 photocatalytic degradation of antibiotics and antibiotic-resistant genes

•The TiO2 decorated with single-atom iron cocatalyst performs enhanced photocatalytic activity.•The enhanced activity depends on the synergistic effect of N-doped biochar and single atom sites on TiO2.•The photocatalyst shows outstanding stability and robust resistance to environmental interference.•A single-atom photocatalyst immobilized film is fabricated for complete removal of various antibiotic pollutants.