Abstract: As a natural organic matter, humic acids (HA) are very difficult to be removed by conventional drinking water treatment processes, and pose a variety of problems during the treatment operation. Ion-doped TiO₂ nanotubes were synthesized via a hydrothermal method and characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and specific surface area analyses. HA were treated by photocatalytic ozonation process, and the effects of the TiO₂ nanotubes on HA removal efficiency were observed. The results indicated that, 1)compared with ozonation alone, the HA removal efficiencies through ultraviolet radiation and TiO₂ catalysis were higher. The HA removal efficiency through photocatalytic ozonation process was 42.1% in the presence of Fe³⁺-doped TiO₂ nanotubes calcined at 500 ℃, 92.2% higher than with ozonation alone. 2)The optimized catalyst was 1.0% Fe³⁺-doped TiO₂ nanotubes calcined at 550 ℃. 3)In addition, the removal efficiency of HA was higher than that of TOC, especially in the first 10 min. 4)The HA removal efficiency in the presence of the activated carbon supported Fe³⁺-doped TiO₂ nanotubes was 97.7%, when the catalyst was used for the first time, while that in the presence of the ceramsite supported Fe³⁺-doped TiO₂ nanotubes was 85.1%. After use for four times, the HA removal efficiencies changed to 82.8% and 73.9% for the ceramsite and activated carbon supported catalysts, respectively. The results show that the HA removal efficiency in the presence of activated carbon supported Fe³⁺-doped TiO₂ nanotubes was higher than that in the presence of ceramsite supported Fe³⁺-doped TiO₂ nanotubes, and the two catalysts had a high catalytic activity after repeatedly being used four times.