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

Farooqi, Zahoor H.; Khan, Shanza Rauf; Begum, Robina; Kanwal, Farah; Sharif, Ahsan; Ahmed, Ejaz; Majeed, Shumaila; Ijaz, Kiran; Ijaz, Aysha

doi:10.3906/kim-1406-40

Cited by 40 publications

(19 citation statements)

References 39 publications

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“…This indicates that no unreacted monomer is present in samples of microgels and hybrid microgels. 17 The spectra in Figure 2 are similar, which shows that fabrication of nanoparticles does not alter the bonds of the polymer. However, due to the interaction between the carbonyl group and nanoparticles, the absorption band of the carbonyl group becomes sharper in hybrid microgels as compared to that in pure microgels.…”

Section: Uv-visible Spectra Of P(nipam-co-aaac) Microgels and Ag-p(nisupporting

confidence: 60%

“…10 We recently published the effect of mole percentage of ionic monomer on size of nanoparticles and catalytic activity of Ag-p(NIPAM-co-AAc) hybrid microgels. 17 In continuation of this work, herein we report a new microgel system containing NIPAM and AAAc fabricated with Ag nanoparticles for catalytic reduction of different nitroarenes in aqueous medium.…”

Section: Aam)]mentioning

confidence: 99%

“…Monoatomic silver aggregates to form nanoparticles within sieves of the microgel network; hence reduction occurs in the whole network of the microgel. 17 Therefore, microgels not only act as microreactor for nanoparticle synthesis but also provide stability to nanoparticles. The golden-yellow dispersion formation after addition of NaBH 4 was due to formation of Ag nanoparticles.…”

Section: In Situ Synthesis Of Silver Nanoparticles In P(nipam-co-aaacmentioning

confidence: 99%

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Fabrication of silver nanoparticles in poly (N-isopropylacrylamide-co-allylacetic acid) microgels for catalytic reduction of nitroarenes

Farooqi¹,

Tariq²,

Begum³

et al. 2015

Turk J Chem

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Poly(N-isopropylacrylamide-co-allyl acetic acid) [p(NIPAM-co-AAAc)] microgels were synthesized in aqueous medium by free radical emulsion polymerization using N-isopropylacrylamide as monomer, allylacetic acid as comonomer, and N,N-methylene-bis-acrylamide as cross-linker. Silver nanoparticles were fabricated inside the microgels by in situ reduction of silver ions. Microgels were analyzed by UV-visible spectroscopy, FTIR, XRD, TEM, and DLS. The formation of silver nanoparticles was confirmed by UV-visible spectroscopy. UV-visible spectra of the Ag-poly(Nisopropylacrylamide-co-allyl acetic acid) hybrid microgels showed a prominent absorption peak at about 411 nm. This peak was due to the surface plasmon resonance effect of silver nanoparticles. The hybrid microgels were used as catalyst for the reduction of nitroarenes. The reduction reactions were found to be first order with respect to nitroarenes with the values of apparent rate constant (k app) equal to 0.248, 0.215, and 0.089 min −1 for 4-nitrophenol, 4-nitroaniline, and nitrobenzene respectively at 27 • C in aqueous medium. Silver nanoparticles were found to be a more effective and efficient catalyst for reduction of 4-nitrophenol and 4-nitroaniline as compared to nitrobenzene.

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Section: Uv-visible Spectra Of P(nipam-co-aaac) Microgels and Ag-p(nisupporting

confidence: 60%

Section: Aam)]mentioning

confidence: 99%

Section: In Situ Synthesis Of Silver Nanoparticles In P(nipam-co-aaacmentioning

confidence: 99%

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Fabrication of silver nanoparticles in poly (N-isopropylacrylamide-co-allylacetic acid) microgels for catalytic reduction of nitroarenes

Farooqi¹,

Tariq²,

Begum³

et al. 2015

Turk J Chem

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“…Farooqi et al used Ag-p(NiPA-co-AAc) hybrid microgels with different AAc content for the catalytic reduction of p-nitrophenol [23]. Farooqi et al also monitored catalytic reduction of p-nitrophenol by using Cu-p(NiPA-coAAc) hybrid microgels as catalyst [26].…”

Section: Introductionmentioning

confidence: 99%

“…These microgels stabilize metal NPs inside the network for the long period due to electron donor-acceptor effect [21,22]. The use of metal NPs containing p(NiPA-co-AAc) hybrid microgels is going to increase day by day due to their tunable catalytic activity, easy separation, reusability, excellent stability, non-toxicity, and easy availability [21,[23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of inorganic–organic polymer microgels for catalytic reduction of 4‐nitroaniline in aqueous medium

et al. 2016

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Poly(N‐isopropylacrylamide‐co‐acrylic acid) [p(NiPA‐co‐AAc)] microgel particles were synthesized by free radical precipitation polymerization in aqueous medium. Silver nanoparticles (Ag NPs) were fabricated inside the microgels by in situ reduction method. UV–visible, Fourier transform infrared (FTIR), and dynamic light scattering techniques were used for characterization of pure microgels. The Ag‐p(NiPA‐co‐AAc) hybrid microgels were characterized by UV–visible, FTIR, X‐ray diffraction, and transmission electron microscopy. The hybrid microgel system was used as a catalyst for reduction of 4‐nitroaniline (4‐NA) in aqueous medium. The kinetics of the catalytic reduction of 4‐NA under various conditions of concentration of hybrid microgels, sodium borohydride (NaBH4), and 4‐NA was monitored by UV–visible spectrophotometry. It was found that the value of apparent rate constant (kapp) increases with increase of concentration of NaBH4 and catalyst dosage while it remains constant at various concentrations of 4‐NA. The kinetic data were used to elaborate the conversion of 4‐NA into p‐phenylenediamine on the basis of electron relaying effect of Ag NPs present inside the microgels. POLYM. COMPOS., 39:645–653, 2018. © 2016 Society of Plastics Engineers

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Catalytic reduction of 4‐nitrophenol using silver nanoparticles‐engineered poly(N‐isopropylacrylamide‐co‐acrylamide) hybrid microgels

Begum

Farooqi

Ahmed

et al. 2016

Applied Organom Chemis

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104

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Nearly monodisperse poly(N‐isopropylacrylamide‐co‐acrylamide) [P(NIPAM‐co‐AAm)] microgels were synthesized using precipitation polymerization in aqueous medium. These microgels were used as microreactors to fabricate silver nanoparticles by chemical reduction of silver ions inside the polymer network. The pure and hybrid microgels were characterized using Fourier transform infrared and UV–visible spectroscopies, dynamic light scattering, X‐ray diffraction, thermogravimetric analysis, differential scanning calorimetry and transmission electron microscopy. Results revealed that spherical silver nanoparticles having diameter of 10–20 nm were successfully fabricated in the poly(N‐isopropylacrylamide‐co‐acrylamide) microgels with hydrodynamic diameter of 250 ± 50 nm. The uniformly loaded silver nanoparticles were found to be stable for long time due to donor–acceptor interaction between amide groups of polymer network and silver nanoparticles. Catalytic activity of the hybrid system was tested by choosing the catalytic reduction of 4‐nitrophenol as a model reaction under various conditions of catalyst dose and concentration of NaBH4 at room temperature in aqueous medium to explore the catalytic process. The progress of the reaction was monitored using UV–visible spectrophotometry. The pseudo first‐order kinetic model was employed to evaluate the apparent rate constant of the reaction. It was found that the apparent rate constant increased with increasing catalyst dose due to an increase of surface area as a result of an increase in the number of nanoparticles.

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

Cited by 40 publications

References 39 publications

Fabrication of silver nanoparticles in poly (N-isopropylacrylamide-co-allylacetic acid) microgels for catalytic reduction of nitroarenes

Fabrication of silver nanoparticles in poly (N-isopropylacrylamide-co-allylacetic acid) microgels for catalytic reduction of nitroarenes

Synthesis and characterization of inorganic–organic polymer microgels for catalytic reduction of 4‐nitroaniline in aqueous medium

Catalytic reduction of 4‐nitrophenol using silver nanoparticles‐engineered poly(N‐isopropylacrylamide‐co‐acrylamide) hybrid microgels

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