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Naphthotriazole derivatives : synthesis and fluorescence properties
Campos, Ana M. F. Oliveira; Rodrigues, Lígia M.; Esteves, Ana Paula; Silva, Marília E.; Sivasubramanian, Aravind; Hrdina, Radim; Soares, Graça M. B.Eight fluorescent compounds containing a naphthotriazole moiety substituted at position 2 by a (vinylsulfonyl)aryl group or its precursors, containing hydroxyl or sulphonic groups or N-methylglycine, were prepared and characterized. The products were recovered in moderate yields after column chromatography or recrystallization and identified by proton and carbon nuclear magnetic resonance spectroscopy. Double r...
Photocatalytic treatment of C. I. Reactive Red 2
Campos, Ana M. F. Oliveira; Gonçalves, M. Sameiro T.; Pinto, Elisa M. M. S.; Amorim, M. T. Pessoa de; Hrdina, Radim; Machalicky, OldrichPolychromatic photo degradation of C.I. Reactive Red 2 in aqueous solutions was studied in the presence of TiO2. The influence of several factors, such as pH value, irradiation time, amount of dye and TiO2 was observed in the process. The dye degradation was monitored by visible absorption spectroscopy and Chemical Oxygen Demand (COD) determinations. It was found, that the mineralization of the dye strongly dep...
Photocatalytic decolourisation of textile azo dyes
Miranda, Teresa; Soares, Graça M. B.; Campos, Ana M. F. Oliveira; Kaja, Martin; Hrdina, Radim; Machalicky, OldrichFour model dyes were synthesised using classical preparative techniques. They represent the molecular structures frequently used in the production of industrial textile mordant dyes. Dyes decolourisation was developed in a lab-scale thin film photoreactor equipped with a white lamp and quartz tube, in the presence of different semiconductors, such as TiO2, ZnO and Fe2O3. The quantum yields of photochemical degr...
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