Synthesis of iron nanoparticles in poly(N-isopropylacrylamide-acrylic acid) hybrid microgels for catalytic reduction of series of organic pollutants: a first approach

Abstract Three different poly(N-isopropylacrylamide-co-acrylic acid) [p(NIPAM-AA)] microgel samples were prepared using a precipitation polymerization method by varying the concentration of NIPAM and AA in aqueous medium. The microgels were used as microreactors to fabricate Ag nanoparticles (NPs) by in situ a reduction method. Fourier transform infrared (FTIR) and UV-visible spectroscopy were used to characterize the pure and hybrid microgels. The hybrid microgels with different AA content were used as catalysts for reduction of nitrobenzene (NB) into aniline. The progress of the reaction was monitored by a UV-visible spectrophotometer. The results show that the value of the apparent rate constant for catalytic reduction of NB decreases from 0.431 min-1 to 0.227 min-1 by increasing AA content from 3 mol% to 7 mol%, respectively. Decrease in apparent rate constant with increase of AA content can be attributed to an increase in hydrophilicity with increase of AA contents of the microgels. The increase in induction period with increase of AA contents indicates that diffusion of NB towards the catalytic surface becomes difficult due to an increase of hydrophilicity.

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Synthesis, characterization and fabrication of copper nanoparticles in N-isopropylacrylamide based co-polymer microgels for degradation of p-nitrophenol

Materials Science-Poland ◽

10.1515/msp-2015-0025 ◽

2015 ◽

Vol 33 (1) ◽

pp. 185-192 ◽

Cited By ~ 25

Author(s):

Zahoor H. Farooqi ◽

Tanzila Sakhawat ◽

Shanza Rauf Khan ◽

Farah Kanwal ◽

Muhammad Usman ◽

...

Keyword(s):

Acrylic Acid ◽

Aqueous Medium ◽

Copper Nanoparticles ◽

Catalytic Reduction ◽

Copper Ions ◽

Effect Of Temperature ◽

Ft Ir ◽

Catalyst Dosage ◽

Hybrid Microgels

AbstractPoly(N-isopropylacrylamide-co-acrylic acid) [P(NIPAM-co-AAc)] microgels were synthesized by precipitation polymerization. Copper nanoparticles were successfully fabricated inside the microgels by in-situ reduction of copper ions in an aqueous medium. The microgels were characterized by Fourier Transform Infrared Spectroscopy (FT-IR) and Dynamic Light Scattering (DLS). Hydrodynamic radius of P(NIPAM-co-AAc) microgel particles increased with an increase in pH in aqueous medium at 25 °C. Copper-poly(N-isopropylacrylamide-co-acrylic acid) [Cu-P(NIPAM-co-AAc)] hybrid microgels were used as a catalyst for the reduction of 4-nitrophenol (4-NP). Effect of temperature, concentration of sodium borohydride (NaBH4) and catalyst dosage on the value of apparent rate constant (kapp) for catalytic reduction of 4-NP in the presence of Cu-P(NIPAM-co-AAc) hybrid microgels were investigated by UV-Vis spectrophotometry. It was found that the value of kapp for catalytic reduction of 4-NP in the presence of Cu-P(NIPAM-co-AAc) hybrid microgel catalyst increased with an increase in catalyst dosage, temperature and concentration of NaBH4 in aqueous medium. The results were discussed in terms of diffusion of reactants towards catalyst surface and swelling-deswelling of hybrid microgels.

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Effect of acrylic acid feed contents of microgels on catalytic activity of silver nanoparticles fabricated hybrid microgels

TURKISH JOURNAL OF CHEMISTRY ◽

10.3906/kim-1406-40 ◽

2015 ◽

Vol 39 ◽

pp. 96-107 ◽

Cited By ~ 27

Author(s):

Zahoor H. FAROOQI ◽

Shanza Rauf KHAN ◽

Robina BEGUM ◽

Farah KANWAL ◽

Ahsan SHARIF ◽

...

Keyword(s):

Silver Nanoparticles ◽

Catalytic Activity ◽

Acrylic Acid ◽

Hybrid Microgels

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Urchin-like hybrid nanostructures of CuOx/Fe2O3 from Cu-mediated pyrolysis of Fe-MOFs for catalytic reduction of organic pollutants

Nanoscale ◽

10.1039/d1nr06142a ◽

2022 ◽

Author(s):

Min Zhang ◽

Aihui Cao ◽

Heng Zhang ◽

Yunlong Zhao ◽

Xintai Su ◽

...

Keyword(s):

Metal Oxides ◽

Organic Pollutants ◽

Catalytic Reduction ◽

Hybrid Nanostructures

MOFs have been widely used as templates to design and construct catalysis materials, such as LDH, metal oxides, and carbon. Herein, we developed a Cu-mediated pyrolysis protocol for the synthesis...

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