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NMR analysis of a series of substituted pyrazolo[3,4-d]pyrimidines-4-amines
Rodrigues, Lígia M.; Sivasubramanian, Aravind; Pinto, Elisa M. M. S.; Campos, Ana M. F. Oliveira; Seijas, Julio A.; Vázquez-Tato, M. PilarA series of twenty one substituted pyrazolo[3,4-d]pyrimidines-4-amines were studied by 1H and 13C NMR. The application of two-dimensional techniques, HMQC and HMBC, allowed the complete assignment of the spectra for all the compounds.
Degradation of C.I. Reactive Orange 4 and its simulated dyebath wastewater by h...
Gonçalves, M. Sameiro T.; Pinto, Elisa M. M. S.; Nkeonye, Peter; Campos, Ana M. F. OliveiraThe commercial azo dye C.I. Reactive Orange 4 in its reactive and hydrolysed forms can be efficiently photodegraded, using commercial samples of TiO2 as a photocatalyst. With UV light, aqueous solutions containing only dye and no dyebath additives are decolorised slightly more rapidly with Riedel-de-Häen TiO2 than with Degussa P-25 TiO2 . The rate of decolorisation increases markedly with increasing pH. Sunlig...
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...
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