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Photocatalysis of sulfo and carboxy derivatives of indigo in a TiO2 slurry with the use of polychromatic irradiation
Authors: Machalický Oldřich | Lichý Lumír | Tomica Marian | Hrdina Radim | Šolcová O.
Year: 2012
Type of publication: článek v odborném periodiku
Name of source: Reaction Kinetics Mechanisms and Catalysis
Publisher name: Springer
Place: Dordrecht
Page from-to: 63-77
Titles:
Language Name Abstract Keywords
cze Fotokatalýza sulfo a karboxy derivátů indiga v TiO2 suspenzi s použitím polychromatického záření Fotokatalytický rozklad indigo-5,5'-disulfonové kyseliny (indigokarminu) a indigo-6,6'-dikarboxylové kyseliny byl studován s použitím TiO2 suspenze a polychromatického zážení generovaného vysokotlakou Hg lampou. Barviva byla rozpuštěna ve vodném roztoku při pH = 10 a fotolyzována v průtočném fotoreaktoru. Reakční produkty byly stanoveny HPLC, NMR a MS spectroskopií. Dva hlavní produkty získané z indigokarminu (2-amino-5-sulfobenzoová kyselina a isatin-5-sulfonová kyselina) byly detegovány. Fotokatalýza indigo-6,6'-dikarboxylové kyseliny poskytla aminotereftalovou kyselinu a isatin-6-karboxylovou kyselinu. Kvantitativní stanovení bylo provedeno pomocí UV/Vis a HPLC s použitím standardů. Byl navržen i stechiometrický model a kinetický popis fotokatalyzovaného rozkladu sulfo a carboxy indiga. Dále byl studován i vliv hydroxidu a uhličitanu na fotokatalýzu. Fotokatalýza; indigo; TiO2; polychromatické záření
eng Photocatalysis of sulfo and carboxy derivatives of indigo in a TiO2 slurry with the use of polychromatic irradiation The photocatalytic decomposition of indigo-5,5'-disulfonic acid (indigocarmine) and indigo-6,6'-dicarboxylic acid has been studied using TiO2 suspension and the polychromatic irradiation of a high-pressure Hg arc lamp. The dyestuffs were dissolved in aqueous medium at pH = 10 and photolyzed in a back-flow tubular photoreactor. The reaction products were determined by HPLC, NMR and MS spectroscopy. Two main photoproducts obtained from indigocarmine (2-amino-5-sulfobenzoic acid and isatine-5-sulfonic acid) were detected. The photocatalysis of indigo-6,6'-dicarboxylic acid gave aminoterephthalic acid and isatine-6-carboxylic acid as two main products. The quantitative analyses of reaction products were performed with UV/Vis and HPLC using chemical standards. A stoichiometric model and kinetic description of photocatalysis of sulfo and carboxy indigo dyes are suggested. The effect of hydroxide and carbonate anions on the rate of photocatalysis was also studied. HETEROGENEOUS PHOTOCATALYSIS; TITANIUM-DIOXIDE; AZO DYES; DEGRADATION; WATER; DISPERSIONS; Indigo derivatives; 2-Amino-5-sulfobenzoic acid; Aminoterephthalic acid; Isatine derivatives; Kinetics; photocatalysis

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