Photocatalytic degradation of hexazinone and its determination in water via UPLC-MS/MS

► Photocatalysis of nano-TiO2 is applied for degradation of hexazinone in water. ► Influences of various parameters for the photocatalytic degradation are studied. ► Small photocatalytic degradation by-products are identified ► Total and nontoxic degradation pathway is proposed. ► UPLC-MS/MS analysis method is developed.