shows UV–vis-DAD and 1
H-NMR spectra of the samples
obtained at the beginning, at two intermediate times and at the
end of the photodegradation process. Fig. 1a shows a decrease in
the absorbance values, which is much more pronounced in the
visible zone. From this figure it follows that when dyes are
removed, the species that absorb in the UV range remain in
solution, but from the shape of the spectrum the number and
type of substances that cause this signal cannot be deduced.Fig. 1b shows the 1
H-NMR spectra. In the spectrum at time
zero, the chemical shifts between 1 and 4.5 ppm, which are
characteristic of aliphatic protons, can be observed.
shows UV–vis-DAD and 1H-NMR spectra of the samplesobtained at the beginning, at two intermediate times and at theend of the photodegradation process. Fig. 1a shows a decrease inthe absorbance values, which is much more pronounced in thevisible zone. From this figure it follows that when dyes areremoved, the species that absorb in the UV range remain insolution, but from the shape of the spectrum the number andtype of substances that cause this signal cannot be deduced.Fig. 1b shows the 1H-NMR spectra. In the spectrum at timezero, the chemical shifts between 1 and 4.5 ppm, which arecharacteristic of aliphatic protons, can be observed.
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