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Reductant‐Free and In‐Situ Green Synthesis of Ag Nanoparticles on Fe 3 O 4 @Nanocellulose and Their Catalytic Activity for the Reduction of Dyes
Author(s) -
Heidari Hannaneh,
Aliramezani Fatemeh
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202004579
Subject(s) - methyl orange , catalysis , nuclear chemistry , fourier transform infrared spectroscopy , materials science , nanocellulose , spectroscopy , adsorption , analytical chemistry (journal) , nanocomposite , selective catalytic reduction , cellulose , chemistry , chemical engineering , nanotechnology , photocatalysis , organic chemistry , physics , quantum mechanics , engineering
In this work, magnetic nanofibrillated cellulose (Fe 3 O 4 @NFC) was prepared and used as green support and reducing agent for the facile synthesis of silver nanoparticles (Ag NPs) by the reflux and hydrothermal methods. The structure of the as‐prepared composites was characterized by various spectroscopic techniques including X‐ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, energy dispersive spectroscopy, inductively coupled plasma atomic emission spectroscopy, vibrating sample magnetometer, and nitrogen adsorption‐desorption isotherms. The catalytic activity of synthetic nanocomposites by the reflux (Fe 3 O 4 @NFC/Ag‐1) and hydrothermal (Fe 3 O 4 @NFC/Ag‐2) methods was investigated in the removal of organic dyes. Moreover, the effects of catalyst amounts, pH values, and drying process on the catalytic activity were also evaluated. The results indicated that the Ag loading and specific surface area of freeze‐dried Fe 3 O 4 @NFC/Ag‐1 were 1.8 wt % and 37 m 2 g −1 , respectively. The catalyst showed the saturation magnetization of 23.5 emu g −1 and could be easily separated and reused again. The freeze‐dried Fe 3 O 4 @NFC/Ag‐1 (0.02 g) synthesized by the reflux method in neutral conditions (pH=7) showed high catalytic activity for the reduction of 4‐nitrophenol (4‐NP), methyl orange (MO), and methylene blue (MB) with rate constants of 40.7×10 −3 s −1 , 7.5×10 −3 s −1 , and 2.9×10 −3 s −1 , respectively.