The photocatalytic degradation of a new insecticide, chlorantraniliprole (CL) was studied in aqueous suspensions of binary (ZnO and Ti02) and ternary (Zn2TiO4) oxides of Zn and Ti under artificial light irradiation (300-460 nm). Photocatalytic experiments showed that the addition of semiconductors, paired with Na2S208 as electron acceptor, greatly improved the elimination of CL in aqueous slurries compared with ZnO and TiO2 alone, and photolytic tests. The reaction rates significantly increased, especially for ZnO/Na2S208 and Ti02/Na2S208 systems with half-lives of 53 and 71 min, respectively. Zn2TiO4/Na2S208 appears to be less effective than ZnO/Na2S208 and Ti02/Na2S208, although it can be used as photocatalyst for CL oxidation (t112 = 462 min). Seven phototransformation products were identified by liquid chromatography tandem mass spectrometry (LC-M52) and liquid chromatography time of flight mass spectrometry (LC-TOF/MS) techniques while its mineralization was followed using dissolved organic carbon (DOC) analysis. The probable photooxidation pathways are proposed and discussed, being hydroxylation and Ndemethylation the major routes of phototransformation observed. (C) 2014 Elsevier B.V. All rights reserved.