Hydroxyl radical-mediated degradation of salicylic acid and methyl paraben: an experimental and computational approach to assess the reaction mechanisms

  • Evrim Arslan
  • Basak Savun Hekimoglu
  • Sesil Agopcan Cinar
  • Nilsun InceEmail author
  • Viktorya AviyenteEmail author
Research Article


Advanced oxidation processes (AOPs) using various energy sources and oxidants to produce reactive oxygen species are widely used for the destruction of recalcitrant water contaminants. The current study is about the degradation of two emerging pollutants—salicylic acid (SA) and methyl paraben (MP)—by high-frequency ultrasonication followed by identification of the oxidation byproducts and modeling of the reaction mechanisms using the density functional theory (DFT). The study also encompasses prediction of the aquatic toxicity and potential risk of the identified byproducts to some aquatic organisms bussing the ECOSAR (Ecological Structure Activity Relationships) protocol. It was found that the degradation of both compounds was governed by •OH attack and the pathways consisted of a cascade of reactions. The rate determining steps were decarboxylation (~ 60 kcal mol−1) and bond breakage reactions (~ 80 kcal mol−1), which were triggered by the stability of the reaction byproducts and overcome by the applied reaction conditions. Estimated values of the acute toxicities showed that only few of the byproducts were harmful to aquatic organisms, implying the environmental friendliness of the experimental method.


PPCPs –OH DFT Sonolysis Reaction mechanism AOPs ECOSAR 



The experimental part of the study was funded by Boğazici University Research Fund (BAP) through Project 18Y00D1.

Supplementary material

11356_2019_6048_MOESM1_ESM.docx (18 mb)
ESM 1 (DOCX 18464 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of ChemistryBoğaziçi UniversityIstanbulTurkey
  2. 2.Institute of Environmental SciencesBoğaziçi UniversityIstanbulTurkey

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