Degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) using UV-illuminated TiO2 suspensions [Degussa P-25 TiO2, Aldrich TiO2 and Indian origin TiO2 (TiO2, SD)] and TiO2 fixed to polyester fabric (PE-PVA-TiO2) or TiO2 layer formed on Ti sheet by name oxidation (Ti/TiO2) has been studied. Mode of adsorption of 2,4-D over TiO2 has been discussed. Significant chemical oxygen demand (COD) has been removed (> 90%) in > 6h irradiation period. The TiO2(SD) catalyst suspensions could be reused to treat fresh doses of 2,4-D. The rate of degradation of 2,4-D followed first-order kinetics. Pyridine is found to inhibit 2,4-D photodegradation strongly.