Abstract
The photocatalysed degradation of a herbicide, 5-bromo-3-sec-butyl-6-methyl uracil (bromacil, 1) has been investigated in aqueous suspensions of titanium dioxide under a variety of conditions. The degradation was studied by monitoring the depletion in total organic carbon (TOC) content as a function of irradiation time. The degradation kinetics of the model compound was studied under different conditions such as pH, catalyst concentration, substrate concentration, different types of TiO2 and in the presence of electron acceptors such as hydrogen peroxide (H2O2) and potassium bromate (KBrO3) besides molecular oxygen. The degradation rate was found to be strongly influenced by all the above factors. Higher degradation rate was observed with Degussa P25 as compared with other photocatalysts. The addition of bromate ion has been found to enhance the degradation rate markedly. 5-Hydroxy-3-sec-butyl-6-methyl uracil (2) and diisopropyl urea (16) were identified as the degradation products by GC-MS analysis and probable pathways for the formation of the products have been proposed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.