UV–vis absorption spectra of 4-nitrophenol taken (a) before, (b) after immediate addition of NaBH4, and (c) after 20 min with the addition of NaBH4 and Fe2O3
An aqueous solution of 4-nitrophenol has a maximum absorption at
317 nm, as shown by a trace in Fig. 4 a.
But it has been observed that, after immediate addition of freshly
prepared aqueous solution of NaBH 4 , the peak due to
4-nitrophenol was red shifted from 317 to 400 nm (see
Fig. 4 b).
The UV–vis absorption spectrum after the addition of pure Fe
2 O 3 nanoparticles in the mixture of
4-nitrophenol and NaBH 4 also remains unaltered with
time, as shown in Fig. 4 c, which means that the pure Fe
2 O 3 nanoparticles do not work as catalyst
for this reaction. .
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