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The photocatalytic degradation of amino and nitro substituted stilbenesulfonic acids by TiO2/UV and Fe2+/H2O2/UV under aqueous conditions

Authors
Journal
Dyes and Pigments
0143-7208
Publisher
Elsevier
Publication Date
Volume
77
Issue
3
Identifiers
DOI: 10.1016/j.dyepig.2007.08.011
Keywords
  • Stilbenesulfonic Acids
  • Fluorescent Whitening Agents
  • Photocatalysis
  • Tio2/Uv
  • Fe2+/H2O2/Uv
  • Photodegradation

Abstract

Abstract The photodegradation products of 4,4′-dinitrostilbene-2,2′-disulfonic acid (DNSDA), 4-amino-4′-nitrostilbene-2,2′-disulfonic acid (ANSDA) and 4,4′-diaminostilbene-2,2′-disulfonic acid (DASDA) imparted by UV, TiO 2/UV and Fe 2+/H 2O 2/UV were characterized by IC, HPLC and LC-ESI-MS/MS. Direct photolysis with UV light allowed the transformation of trans-isomers to the corresponding cis-isomers followed by degradation to aromatic aldehydes and carboxylic acids. Whilst both TiO 2/UV and Fe 2+/H 2O 2/UV processes mineralized the model compounds, Fe 2+/H 2O 2/UV process was more rapid than TiO 2/UV.

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