Coumarin-based quantification of hydroxyl radicals and other reactive species generated on excited nitrogen-doped TiO2

In order to extend the photoactivity of titanium dioxide into visible region, highly porous nitrogen-doped TiO2 catalysts (NTiO2) were successfully synthesized by a modified co-precipitation method with ammonium hydroxide as nitrogen source. Different approaches such dosing reagents and temperature synthesis, calcination period tested examine optimum outcome regarding photocatalytic OH radical formation under UV light. Coumarin traditional probe for this purpose was applied; measuring luminescence 7-hydroxycoumarin produced in reaction radicals, beside other hydroxylated derivatives. Only few percentages coumarin molecules reacted while most them underwent reactions photogenerated species electrons (anaerobic/aerobic) superoxide anion radicals (aerobic). Accordingly, our observations suggest that can also be used quantify reactive species. The results obtained from difference between amounts degraded derivatives formed during experiments. These coumarin-based quantifications applied characterization prepared (NTiO2). addition, material analysis (X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectrometry, Fourier transform infrared spectroscopy) showed crystallinity content found crucial features performance catalysts.