Degradation, mineralization of bromoxynil pesticide by heterogeneous photocatalytic ozonation

The photocatalysts of Cs doped bare TiO2, 0.50 and 1.0 wt% were prepared by wet-impregnation method and characterized by XRD, SEM-EDX, TEM, BET, ICP, FTIR, and UV-DRS analyses. The degradation of bromoxynil was investigated under visible irradiation with ozone to compare the efficiency of these photoinduced advanced oxidation techniques. Photocatalysis with 1% Cs/TiO2 was yielded 100% degradation and mineralization of bromoxynil in 2 h at basic pH. The extent of degradation was confirmed by GC-MS. The oxidation products were identified by H-1 NMR and GC-MS spectral analyses. The catalyst is fully recoverable and reusable multiple times with no loss of activity. (C) 2014 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.