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Journal of Advanced Oxidation Technologies

Ed. by Dionysiou, Dionysios D.

2 Issues per year


IMPACT FACTOR 2016: 0.564
5-year IMPACT FACTOR: 0.716

CiteScore 2016: 0.78

SCImago Journal Rank (SJR) 2015: 0.281
Source Normalized Impact per Paper (SNIP) 2015: 0.311

Online
ISSN
2371-1175
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Volume 10, Issue 1 (Jan 2007)

Issues

Enhancement and Modeling of the Photocatalytic Degradation of Benzoic Acid

Nevim San
  • Department of Chemistry, Yıldız Technical University, 34220 Istanbul, Turkey
/ Murat Kılıç
  • Department of Chemistry, Yıldız Technical University, 34220 Istanbul, Turkey
/ Zoya Tuiebakhova
  • Yeditepe University, Chemical Engineering Department, 34755 Istanbul, Turkey
/ Zekiye Çınar
  • Corresponding author
  • Department of Chemistry, Yıldız Technical University, 34220 Istanbul, Turkey
  • Email:
Published Online: 2016-11-30 | DOI: https://doi.org/10.1515/jaots-2007-0108

Abstract

The kinetics of the photocatalytic degradation of benzoic acid in the presence of TiO2 has been investigated experimentally and theoretically. The effects of catalyst loading, initial concentration of benzoic acid and the electron acceptors; H2O2, K2S2O8 and OXONE on the degradation rate have been examined. A pseudo-first order kinetic model has been used to describe the results. With the intention of predicting the primary intermediates and the product distribution, geometry optimizations of the reactants, product radicals and transition state complexes have been performed with the semi-empirical PM3 and DFT/B3LYP/6-31G* methods. Solvation effects have been computed by DFT calculations at the B3LYP/6-31G* level using COSMO as the solvation model. Based on the results of the quantum mechanical calculations, the rate constants of the four possible reaction paths have been calculated by means of Transition State Theory. A branching ratio for each of the reaction paths has been calculated and the product distribution for the degradation reaction has been determined. The results show that ortho-, meta- and para-hydroxybenzoic acids are formed as the primary intermediates in the photocatalytic degradation of benzoic acid.

Keywords: Photocatalytic degradation; hydroxyl radicals; benzoic acid; DFT calculations; COSMO

About the article

Received: 2006-01-03

Accepted: 2006-08-18

Published Online: 2016-11-30

Published in Print: 2007-01-01


Citation Information: Journal of Advanced Oxidation Technologies, ISSN (Online) 2371-1175, ISSN (Print) 1203-8407, DOI: https://doi.org/10.1515/jaots-2007-0108.

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