Photocatalytic degradation of 1,5-naphthalenedisulfonate on colloidal titanium dioxide

Erzsébet Szabó-Bárdos, Zoltán Zsilák, G. Lendvay, O. Horváth, Otília Markovics, A. Hoffer, Norbert Töro

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Photocatalytic degradation of 1,5-naphthalenedisulfonate (NDS) was investigated by monitoring the absorption and emission spectral changes, chemical oxygen demand, total organic carbon (TOC) content as well as pH and sulfate concentration. Intermediates formed during the irradiation were also detected by liquid chromatographic-mass spectrometric analysis. The results obtained by the applied analytical techniques clearly indicate that the initial step of degradation is oxygenation (hydroxylation) of the starting surfactant resulting in the formation of an 8-hydroxy derivative, although desulfonation and some mineralization, that is, decrease of TOC indicating carbon dioxide generation, also take place at this stage. Further oxygenation and desulfonation lead to the destruction of the diaromatic naphthalene system, then to ring fission, producing diols, aldehydes, and carboxylic acids on the side-chains. A tentative scheme involving possible pathways of degradation is proposed, taking the intermediates detected by mass spectrometry into consideration. On the basis of the results of quantum chemical calculations, the most possible points of attack by HO radical were identified, supplementing the MS results, and elucidating the initial oxidation step in the degradation of NDS and the benzenesulfonate (BS) intermediate. Thus, in the case of NDS para position is favored for hydroxylation, while for BS, formation of the ortho-hydroxy derivative is preferred.

Original languageEnglish
Pages (from-to)14500-14508
Number of pages9
JournalJournal of Physical Chemistry B
Volume112
Issue number46
DOIs
Publication statusPublished - Nov 20 2008

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titanium oxides
Titanium dioxide
degradation
Degradation
Hydroxylation
Oxygenation
oxygenation
Organic carbon
Derivatives
spectral emission
acids
carbon
Chemical oxygen demand
Naphthalene
Carboxylic Acids
Aldehydes
Carboxylic acids
aldehydes
naphthalene
Carbon Dioxide

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Surfaces, Coatings and Films

Cite this

Photocatalytic degradation of 1,5-naphthalenedisulfonate on colloidal titanium dioxide. / Szabó-Bárdos, Erzsébet; Zsilák, Zoltán; Lendvay, G.; Horváth, O.; Markovics, Otília; Hoffer, A.; Töro, Norbert.

In: Journal of Physical Chemistry B, Vol. 112, No. 46, 20.11.2008, p. 14500-14508.

Research output: Contribution to journalArticle

Szabó-Bárdos, Erzsébet ; Zsilák, Zoltán ; Lendvay, G. ; Horváth, O. ; Markovics, Otília ; Hoffer, A. ; Töro, Norbert. / Photocatalytic degradation of 1,5-naphthalenedisulfonate on colloidal titanium dioxide. In: Journal of Physical Chemistry B. 2008 ; Vol. 112, No. 46. pp. 14500-14508.
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