Metal nanoparticles catalyzed reduction of 4-nitrophenol to 4-aminophenol in presence of NaBH4

February 23, 2024

• Title:       

  Metal nanoparticles catalyzed reduction of 4-nitrophenol to 4-aminophenol in presence of NaBH4

• Image Source:

  Green synthesis of gold, silver, platinum, and palladium nanoparticles reduced and stabilized by sodium rhodizonate and their catalytic reduction of 4-nitrophenol and methyl orange

• Mark:

  Scheme 2

• Associated context:

  The catalytic activity of the nanoparticles was evaluated by a reduction  reaction, Scheme 2. The reaction was the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in presence of excess NaBH₄. For the reduction of 4-NP, in a standard quartz cuvette 1 mL of 4-NP aqueous solution (0.2 mM) was mixed with 50 µL of NPs stock solution. Afterwards, 0.5 mL of freshly prepared NaBH₄ aqueous solution (5mg NaBH₄ in 0.5 ml of water) was added into the quartz cuvette and  the reaction course was monitored, every 30 second, by using the UV-Vis spectrophotometer.  The UV-Vis spectrophotometer monitored the time-dependent lowering of the absorbance of 4-nitrophenolate at 400 nm. It is worth mentioning that the 4-NP reacts with NaBH₄ to yield 4-nitrophenolate, which shows strong absorption band centred at 400 nm.