3 years ago

Chemically clean synthesis and characterization of graphene oxide-poly(acrylic acid–sodium styrene sulfonate) composite thermostable elastic gel encapsulating copper nanoparticles for efficient catalytic reduction of 4-nitrophenol

Chemically clean synthesis and characterization of graphene oxide-poly(acrylic acid–sodium styrene sulfonate) composite thermostable elastic gel encapsulating copper nanoparticles for efficient catalytic reduction of 4-nitrophenol
Lalit Varshney, Y. K. Bhardwaj, Jhimli Paul Guin
The thermostable chemically blended elastic poly-(acrylic acid–sodium-styrene-sulfonate–graphene oxide) super-absorbent hydrogel was synthesized by additive-free gamma-radiation induced polymerization followed by crosslinking method. It showed the best swelling ratio in water due to its porous nature. The composite material adsorbed 98 mg/g Cu(II) at room temperature from the aqueous solution of Cu(II) at pH 5 by the chemi-adsorption of Cu(II) ions at several energetically heterogeneous functional groups. The copper nanoparticles (CuNPs) of size 12 ± 8 nm had been synthesized in situ by chemical reduction of the pre-adsorbed Cu(II) ions. The functional groups of composite hydrogel served as complexing agent and nano-reaction sites. Avoiding any pre-reduction induction time, the inexpensive CuNPs catalytically completely decolorized the aqueous solution of 4-nitrophenol (4-NP) within 60 s in the presence of NaBH4 at a promising calculated rate constant (9.0 × 10−2/s) ever reported in the literatures. It is in contrast to the commonly noticeable phenomenon for other CuNPs-based catalysis of 4-NP. The composite hydrogel matrix helped to retain the catalytic activity of CuNPs and simultaneously it helped in the osmotic inclusion of 4-NP into the reaction cites. This composite hydrogel synthesized through a chemically clean method could be utilized for efficient conversion of hazardous chemical 4-NP to industrially important chemical 4-aminophenol. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46200.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/app.46200

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