Photodegradation kinetics of organophosphorous with hydroxyl radicals: Experimental and theoretical study


Creative Commons License

AYDOĞDU Ş. , HATİPOĞLU A. , Eren B., YALÇIN GÜRKAN Y.

JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, vol.86, no.10, pp.955-969, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 86 Issue: 10
  • Publication Date: 2021
  • Doi Number: 10.2298/jsc210409056a
  • Journal Name: JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Aquatic Science & Fisheries Abstracts (ASFA), CAB Abstracts, Central & Eastern European Academic Source (CEEAS), Chemical Abstracts Core, Communication Abstracts, Food Science & Technology Abstracts, Metadex, Directory of Open Access Journals, Civil Engineering Abstracts
  • Page Numbers: pp.955-969
  • Keywords: UV-light, TiO2, heterogenous catalysis, DFT, CPCM, GAS-PHASE REACTIONS, PHOTOCATALYTIC DEGRADATION, ADVANCED OXIDATION, AQUEOUS-SOLUTION, AZINPHOS-METHYL, MECHANISM, PESTICIDES, TIO2, THERMOCHEMISTRY, CHLORPYRIFOS
  • Yıldız Technical University Affiliated: Yes

Abstract

The presence of organophosphorus compounds (OPs) in the environmental counterparts has become an important problem because of their toxicity. In this study, the photocatalytic degradation reactions of the three OPs with hydroxyl radical were investigated by both experimental and quantum chemical methods. Photocatalytic degradation kinetics of the examined organophosphorus compounds were investigated under UV-A irradiation using TiO2 as the photocatalyst. The effects of the initial concentrations on the degradation rate have been examined. There was an observable loss of OPs in the presence of TiO2 photocatalyst under UV-A at 0.2 g TiO2 per 100 mL. The quantum chemical calculations have been carried out by the density functional theory (DFT) at B3LYP/6-31g(d) level. The reaction pathways were modelled to find the most probable mechanism for OPs with the OH radical and to determine the primary intermediates. The rate constants of the eight reaction paths were calculated by the transition state theory. Conductor-like polarizable continuum model (CPCM) was used as the solvation model with the intention of understanding the water effect. The theoretical results were in agreement with experimental ones.