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Core‐shell microgel stabilized silver nanoparticles for catalytic reduction of aryl nitro compounds
Author(s) -
Naseem Khalida,
Begum Robina,
Farooqi Zahoor H.,
Wu Weitai,
Irfan Ahmad
Publication year - 2020
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.5742
Subject(s) - chemistry , sodium borohydride , catalysis , fourier transform infrared spectroscopy , nuclear chemistry , silver nanoparticle , borohydride , reducing agent , nitro , inorganic chemistry , nanoparticle , dynamic light scattering , organic chemistry , chemical engineering , alkyl , engineering
Silver nanoparticles loaded into shell of poly (styrene‐N‐isopropylmethacrylamide‐co‐acrylic acid) core shell [P (SNA‐CS)] gel particles were synthesized and analyzed by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), ultraviolet–visible spectroscopy (UV–vis) and dynamic light scattering (DLS). Catalytic activity of Ag@P (SNA‐CS) particles was investigated by reducing p‐nitroaniline (p‐NA) into p‐aminoaniline (p‐AA) in the presence of sodium borohydride (NaBH 4 ) reductant. Molecules of the substrate adsorbed on the surface of silver nanoparticles interact with borohydride ions (BH 4 − ) to form p‐AA. Other nitroarenes like o‐nitroaniline (o‐NA), p‐nitrophenol (p‐NP) o‐nitrophenol (o‐NP), 2,4‐dinitrophenol(2,4‐DNP) were also reduced into their corresponding aryl amines using Ag@P (SNA‐CS) composite microgels as catalyst. Reported catalyst efficiently reduced the nitro aromatic compounds individually as well as simultaneously at ambient temperature. Effect of different reaction conditions (catalyst dose, concentration of NaBH 4 and concentration of p‐NA) on reaction completion time, value of apparent rate constant (k app ) and reduction efficiency of the catalyst for reduction of p‐NA was also demonstrated. Ag@P (SNA‐CS) catalyst was found to be able to retain activity up to four cycles.