Photocatalytic degradation of benzenesulfonate on colloidal titanium dioxide

Erzsébet Szabó-Bárdos, Otília Markovics, O. Horváth, Norbert Toro, G. Kiss

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Titanium dioxide-mediated photocatalyzed degradation of benzenesulfonate (BS) was investigated by monitoring chemical oxygen demand (COD), total organic carbon (TOC) content, sulfate concentration, pH as well as the absorption and emission spectral changes in both argon-saturated and aerated systems. Liquid chromatography-mass spectrometry analysis was utilized for the detection of intermediates formed during the irradiation in the UVA range (λmax = 350 nm). The results obtained by these analytical techniques indicate that the initial step of degradation is hydroxylation of the starting surfactant, resulting in the production of hydroxy- and dihydroxybenzenesulfonates. These reactions were accompanied by desulfonation, which increases [H+] in both argon-saturated and aerated systems. In accordance with our previous theoretical calculations, the formation of ortho- and meta-hydroxylated derivatives is favored in the first step. The main product of the further oxygenation of these derivatives was 2,5-dihydroxy-benzesulfonate. No decay of the hydroxy species occurred during the 8-h irradiation in the absence of dissolved oxygen. In the aerated system much more efficient desulfonation and hydroxylation, moreover, a significant decrease of TOC took place at the initial stage. Further hydroxylation led to cleavage of the aromatic system, due to the formation of polyhydroxy derivatives, followed by ring fission, resulting in the production of aldehydes and carboxylic acids. Total mineralization was achieved by the end of the 8-h photocatalysis. It has been proved that in this photocatalytic procedure the presence of dissolved oxygen is necessary for the cleavage of the aromatic ring because hydroxyl radicals photochemically formed in the deaerated system too alone are not able to break the C-C bonds.

Original languageEnglish
Pages (from-to)1617-1628
Number of pages12
JournalWater Research
Volume45
Issue number4
DOIs
Publication statusPublished - Feb 2011

Fingerprint

Hydroxylation
argon
Titanium dioxide
cleavage
total organic carbon
dissolved oxygen
irradiation
Dissolved oxygen
Organic carbon
Derivatives
Degradation
degradation
Argon
oxygenation
carboxylic acid
hydroxyl radical
aldehyde
Irradiation
chemical oxygen demand
surfactant

Keywords

  • Benzenesulfonate
  • Intermediates
  • Oxidative degradation
  • Oxygenation
  • Photocatalysis
  • Titanium dioxide

ASJC Scopus subject areas

  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Ecological Modelling

Cite this

Photocatalytic degradation of benzenesulfonate on colloidal titanium dioxide. / Szabó-Bárdos, Erzsébet; Markovics, Otília; Horváth, O.; Toro, Norbert; Kiss, G.

In: Water Research, Vol. 45, No. 4, 02.2011, p. 1617-1628.

Research output: Contribution to journalArticle

Szabó-Bárdos, Erzsébet ; Markovics, Otília ; Horváth, O. ; Toro, Norbert ; Kiss, G. / Photocatalytic degradation of benzenesulfonate on colloidal titanium dioxide. In: Water Research. 2011 ; Vol. 45, No. 4. pp. 1617-1628.
@article{75fde6e151a54fc89b8f88da608a09eb,
title = "Photocatalytic degradation of benzenesulfonate on colloidal titanium dioxide",
abstract = "Titanium dioxide-mediated photocatalyzed degradation of benzenesulfonate (BS) was investigated by monitoring chemical oxygen demand (COD), total organic carbon (TOC) content, sulfate concentration, pH as well as the absorption and emission spectral changes in both argon-saturated and aerated systems. Liquid chromatography-mass spectrometry analysis was utilized for the detection of intermediates formed during the irradiation in the UVA range (λmax = 350 nm). The results obtained by these analytical techniques indicate that the initial step of degradation is hydroxylation of the starting surfactant, resulting in the production of hydroxy- and dihydroxybenzenesulfonates. These reactions were accompanied by desulfonation, which increases [H+] in both argon-saturated and aerated systems. In accordance with our previous theoretical calculations, the formation of ortho- and meta-hydroxylated derivatives is favored in the first step. The main product of the further oxygenation of these derivatives was 2,5-dihydroxy-benzesulfonate. No decay of the hydroxy species occurred during the 8-h irradiation in the absence of dissolved oxygen. In the aerated system much more efficient desulfonation and hydroxylation, moreover, a significant decrease of TOC took place at the initial stage. Further hydroxylation led to cleavage of the aromatic system, due to the formation of polyhydroxy derivatives, followed by ring fission, resulting in the production of aldehydes and carboxylic acids. Total mineralization was achieved by the end of the 8-h photocatalysis. It has been proved that in this photocatalytic procedure the presence of dissolved oxygen is necessary for the cleavage of the aromatic ring because hydroxyl radicals photochemically formed in the deaerated system too alone are not able to break the C-C bonds.",
keywords = "Benzenesulfonate, Intermediates, Oxidative degradation, Oxygenation, Photocatalysis, Titanium dioxide",
author = "Erzs{\'e}bet Szab{\'o}-B{\'a}rdos and Ot{\'i}lia Markovics and O. Horv{\'a}th and Norbert Toro and G. Kiss",
year = "2011",
month = "2",
doi = "10.1016/j.watres.2010.11.045",
language = "English",
volume = "45",
pages = "1617--1628",
journal = "Water Research",
issn = "0043-1354",
publisher = "Elsevier Limited",
number = "4",

}

TY - JOUR

T1 - Photocatalytic degradation of benzenesulfonate on colloidal titanium dioxide

AU - Szabó-Bárdos, Erzsébet

AU - Markovics, Otília

AU - Horváth, O.

AU - Toro, Norbert

AU - Kiss, G.

PY - 2011/2

Y1 - 2011/2

N2 - Titanium dioxide-mediated photocatalyzed degradation of benzenesulfonate (BS) was investigated by monitoring chemical oxygen demand (COD), total organic carbon (TOC) content, sulfate concentration, pH as well as the absorption and emission spectral changes in both argon-saturated and aerated systems. Liquid chromatography-mass spectrometry analysis was utilized for the detection of intermediates formed during the irradiation in the UVA range (λmax = 350 nm). The results obtained by these analytical techniques indicate that the initial step of degradation is hydroxylation of the starting surfactant, resulting in the production of hydroxy- and dihydroxybenzenesulfonates. These reactions were accompanied by desulfonation, which increases [H+] in both argon-saturated and aerated systems. In accordance with our previous theoretical calculations, the formation of ortho- and meta-hydroxylated derivatives is favored in the first step. The main product of the further oxygenation of these derivatives was 2,5-dihydroxy-benzesulfonate. No decay of the hydroxy species occurred during the 8-h irradiation in the absence of dissolved oxygen. In the aerated system much more efficient desulfonation and hydroxylation, moreover, a significant decrease of TOC took place at the initial stage. Further hydroxylation led to cleavage of the aromatic system, due to the formation of polyhydroxy derivatives, followed by ring fission, resulting in the production of aldehydes and carboxylic acids. Total mineralization was achieved by the end of the 8-h photocatalysis. It has been proved that in this photocatalytic procedure the presence of dissolved oxygen is necessary for the cleavage of the aromatic ring because hydroxyl radicals photochemically formed in the deaerated system too alone are not able to break the C-C bonds.

AB - Titanium dioxide-mediated photocatalyzed degradation of benzenesulfonate (BS) was investigated by monitoring chemical oxygen demand (COD), total organic carbon (TOC) content, sulfate concentration, pH as well as the absorption and emission spectral changes in both argon-saturated and aerated systems. Liquid chromatography-mass spectrometry analysis was utilized for the detection of intermediates formed during the irradiation in the UVA range (λmax = 350 nm). The results obtained by these analytical techniques indicate that the initial step of degradation is hydroxylation of the starting surfactant, resulting in the production of hydroxy- and dihydroxybenzenesulfonates. These reactions were accompanied by desulfonation, which increases [H+] in both argon-saturated and aerated systems. In accordance with our previous theoretical calculations, the formation of ortho- and meta-hydroxylated derivatives is favored in the first step. The main product of the further oxygenation of these derivatives was 2,5-dihydroxy-benzesulfonate. No decay of the hydroxy species occurred during the 8-h irradiation in the absence of dissolved oxygen. In the aerated system much more efficient desulfonation and hydroxylation, moreover, a significant decrease of TOC took place at the initial stage. Further hydroxylation led to cleavage of the aromatic system, due to the formation of polyhydroxy derivatives, followed by ring fission, resulting in the production of aldehydes and carboxylic acids. Total mineralization was achieved by the end of the 8-h photocatalysis. It has been proved that in this photocatalytic procedure the presence of dissolved oxygen is necessary for the cleavage of the aromatic ring because hydroxyl radicals photochemically formed in the deaerated system too alone are not able to break the C-C bonds.

KW - Benzenesulfonate

KW - Intermediates

KW - Oxidative degradation

KW - Oxygenation

KW - Photocatalysis

KW - Titanium dioxide

UR - http://www.scopus.com/inward/record.url?scp=78651445029&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78651445029&partnerID=8YFLogxK

U2 - 10.1016/j.watres.2010.11.045

DO - 10.1016/j.watres.2010.11.045

M3 - Article

C2 - 21185053

AN - SCOPUS:78651445029

VL - 45

SP - 1617

EP - 1628

JO - Water Research

JF - Water Research

SN - 0043-1354

IS - 4

ER -