AC/TiO₂ composite particles were prepared by peptization-reflux method using Ti(OBu)₄ as raw material, and three kinds of samples were obtained by adding phytic acid, BTA and SnCl₄. FE-SEM observation shows the surface of AC is closely coated by TiO₂ about 20-30 nm in size. Spongy TiO₂ coatings were obtained when phytic acid was added, while finer TiO₂ particles were formed on samples with the addition of BTA. XPS of Ti element in three kinds of samples show that the difference in binding energy of Ti 2p_3/2 and Ti 2p_1/2 is about 5.7 eV, indicating the purity of TiO₂ on the surfaces of AC is high. Ramman spectra of TiO₂ particles prepared by blank experiment without AC show that TiO₂ particles are anatase. The photo-catalytic activity and absorptive capability of composite particles are studied by using TNT waste water as target pollutant. The results show that the absorptive capability of composite particles with phytic acid or BTA is slightly higher than that of AC. All samples of AC/TiO₂ have better UV photo-catalytic activity compared with AC, and for AC/TiO₂ particles with BTA the degradation of the TNT reached 99.3%, which was attributed to the synergistc effect of AC and TiO₂.