New catalytic route: Hydrogels as templates and reactors for in situ Ni nanoparticle synthesis and usage in the reduction of 2- and 4-nitrophenols

Şahiner, Nurettin; Özay, Hava; Özay, Özgür; Aktaş, Nahit

doi:10.1016/j.apcata.2010.07.004

Cited by 253 publications

(114 citation statements)

References 25 publications

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“…Therefore Ni nanoparticles show a rapid reduction of 4-NP as compared to Co nanoparticles. Sahiner et al (25,41) synthesized Co-p(AMPS) and Ni-p(AMPS) catalysts and used them for the reduction of 2-NP and 4-NP. They observed that Ni nanoparticles fabricated in hydrogels are a more efficient catalyst for the reduction of 4-nitrophenol as compared to Co nanoparticles fabricated in hydrogels.…”

Section: Catalytic Activity Of Hybrid Microgelsmentioning

confidence: 99%

“…easily fix the nanoparticles within microgels. Hybrid microgels are extensively used as catalysts for the reduction of nitroarenes (4,25,41), nitriles (aliphatic and aromatic) (42) and coupling reactions (43). To the best of our knowledge, no researcher has yet studied the catalysis of p-nitrophenol (4-NP) by using Co and Ni nanoparticles fabricated in poly(N-isopropylacrylamide-co-methacrylic acid) [p(NIPAM-co-MAA)] hybrid microgels.…”

Section: Introductionmentioning

confidence: 99%

“…Nabid et al (42) used nickel-iron oxide-(3-aminopropyl)triethoxysilane-poly (4-vinylpyridine) [Ni-Fe 3 O 4 -SiO 2 -P4VP] hybrid microgels for the catalytic reduction of nitriles. Sahiner et al (25,41) studied the catalytic reduction of ortho-nitrophenol (2-NP) and 4-NP by using nickel-poly(2-acrylamido-2-methyl-1-propansulfonic acid) [Ni-p(AMPS)] and cobalt-poly(2-acrylamido-2-methyl-1-propansulfonic acid) [Co-p(AMPS)] hybrid microgels. Nickel-poly(acrylic acid) hybrid spherical polyelectrolyte brushes were used by Zhu et al (44) for the catalytic reduction of 4-NP.…”

Section: Introductionmentioning

confidence: 99%

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Cobalt and nickel nanoparticles fabricated p(NIPAM-co-MAA) microgels for catalytic applications

et al. 2014

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Abstract:In this research work, multi-responsive poly(Nisopropylacrylamide-co-methacrylic acid) copolymer microgels were synthesized via emulsion polymerization in aqueous medium. Then, nickel and cobalt nanoparticles were fabricated within these microgels by in situ reduction of metal ions using sodium borohydride (NaBH 4 ) as a reducing agent. Fourier transform infrared spectroscopy was used to characterize these microgels. The pH sensitivity of these copolymer microgels was studied using dynamic light scattering technique (DLS). DLS studies revealed that the hydrodynamic radius of these microgels increased with the increase in pH of the medium at 25°C. The catalytic activity of hybrid microgels for the reduction of p-nitrophenol (4-NP) to p-aminophenol (4-AP) was investigated by UV-visible spectrophotometery. The value of apparent rate constant of reaction was found to change linearly with catalyst dosage. The nickel-based hybrid system was found to be five times more efficient as a catalyst compared to the cobalt-based hybrid system for the reduction of 4-NP to 4-AP in aqueous medium.

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Section: Catalytic Activity Of Hybrid Microgelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cobalt and nickel nanoparticles fabricated p(NIPAM-co-MAA) microgels for catalytic applications

et al. 2014

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“…Silver (Ag), 8,9 platinum (Pt), 10 copper (Cu), 11,12 nickel (Ni), 13,14 iron (Fe), 15 and gold (Au) 16,17 metal nanoparticles have been extensively used as catalysts in various reactions. For example, p-nitrophenol (p-NP), 9,18 nitrobenzene (NB), 19,20 o-nitrophenol (o-NP) 21,22 and m-nitrophenol 22 can be reduced in aqueous medium using metal nanoparticles as catalysts.…”

Section: −7mentioning

confidence: 99%

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

Farooqi¹,

Khan²,

Begum³

et al. 2015

Turk J Chem

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Abstract:We synthesized poly(N-isopropylacrylamide-co-acrylic acid) microgels with 1, 3, 5, and 7 mol percentage of acrylic acid. Silver nanoparticles were fabricated inside these microgels at room temperature. Pure microgels were characterized by Fourier transform infrared (FTIR) spectroscopy and dynamic light scattering (DLS). Hybrid microgels were characterized by UV-Visible spectroscopy. The size of the silver nanoparticles increased with an increase in the content of acrylic acid. Catalytic activity of these hybrid microgels was investigated using UV-Visible spectrophotometry.Induction time decreased from 8.8 to 2.6 min and the value of apparent rate constant decreased from 0.226 to 0.109 min −1 , when the content of acrylic acid was increased from 1 to 7 mol %. This decrease in induction time was due to decrease in the surface area of nanoparticles present within the microgels with an increase in the feed contents of acrylic acid. The decrease in the value of apparent rate constant was due to an increase in the size of nanoparticles fabricated within the microgels with an increase in mol percentage of acrylic acid. The linear relation between apparent rate constant and feed contents of acrylic acid can be used for quantitative analysis of contents of acrylic acid present in polymer microgels.

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“…Similarly, the absorption maxima of 4-NP changed from 318 to 400 nm because of conversion of 4-NP into 4-nitropheolate ion in the presence of NaBH 4 , and is presented in Figure 4B. 35 It was also investigated that neither metal nanoparticles nor NaBH 4 alone can degrade the 4-NP a sharp decrease in absorption maxima was observed for 4-nitrophenolate ions as shown in Figure 5A-C. The peak that appeared at 300 nm is assigned to the formation of 4-aminophenols.…”

Section: Catalytic Activities Of Cu Pd and Their Bimetallic Pd@cu Namentioning

confidence: 99%

Synthesis, structural characterization and catalytic application of citrate-stabilized monometallic and bimetallic palladium@copper nanoparticles in microbial anti-activities

Ullah

Khan²,

Sohail³

et al. 2017

IJN

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In this research work, copper (Cu), palladium (Pd) and their bimetallic palladium@ copper (Pd@Cu) nanoparticles were synthesized using trisodium citrate as a stabilizing agent using the known chemical reduction method. The synthesized Cu, Pd and Pd@Cu nanoparticles were characterized by the ultraviolet–visible spectroscopy, scanning electron microscopy and X-ray diffraction spectroscopy, respectively. The different volumes of trisodium citrate were used for the stability of synthesized monometallic Cu, Pd and bimetallic Pd@Cu nanoparticles. The synthesized Cu, Pd and their bimetallic Pd@Cu nanoparticles were used as catalysts for the reduction of 4-nitrophenol in the presence of NaBH 4 . The bimetallic Pd@Cu nanoparticles had efficient catalytic activities with a high rate constant (1.812 min −1 ) as compared to monometallic Cu (0.3322 min −1 ) and Pd (0.2689 min −1 ) nanoparticles, respectively. The correlation coefficient ( R 2 ) was found to be 0.99 for these three nanoparticles. Meanwhile, the effect of Cu, Pd and bimetallic Pd@Cu nanoparticles was checked on the physiology of specific different micro-organism strains. The bimetallic Pd@Cu nanoparticles reported the maximum resistance at maximum level the growth of bacterial strain and had observed a smooth antibacterial graph than the monometallic analogs.

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New catalytic route: Hydrogels as templates and reactors for in situ Ni nanoparticle synthesis and usage in the reduction of 2- and 4-nitrophenols

Cited by 253 publications

References 25 publications

Cobalt and nickel nanoparticles fabricated p(NIPAM-co-MAA) microgels for catalytic applications

Cobalt and nickel nanoparticles fabricated p(NIPAM-co-MAA) microgels for catalytic applications

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

Synthesis, structural characterization and catalytic application of citrate-stabilized monometallic and bimetallic palladium@copper nanoparticles in microbial anti-activities

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