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The electrochemical treatment of CI Direct Red 81 and CI Direct Black 36 solutions using platinum and mercury electrodes was investigated. Additionally, the electrochemical oxidation at the titanium electrode coated with TiO2/RuO2 was studied. The optimal electrochemical parameters applied for photoelectrochemical oxidation increased the effectiveness of the dyes’ decolorisation and mineralisation.

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Novel dyes based on a 3-formyl-2(1H)-quinolone skeleton were synthesised and characterised using 1 H nuclear magnetic resonance spectroscopy and mass spectrometry. The spectroscopic properties of these dyes, such as their absorption spectra, emission spectra, and quantum fluorescence yields, were also examined. The behaviour of the obtained compounds at a pH of 7.4 in the absence and in the presence of thiol amino acids, such as L-cysteine, L-glutathione, and N-acetyl-L-cysteine, were studied. The spectroscopic responses of the tested dyes towards other amino acids were also investigated. A reference compound was synthesised to understand the reaction mechanism between the thiols and the obtained dyes. The experimental results show that the synthesised dyes have the potential to act as sensors for thiols. Coloration TechnologySociety of Dyers and Colourists 157

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