Basic concepts and recent advances in nitrophenol reduction by gold- and other transition metal nanoparticles

Zhao, Pengxiang; Feng, Xing‐Wen; Huang, Dajian; Yang, Guohai; Astruc, Didier

doi:10.1016/j.ccr.2015.01.002

Cited by 717 publications

(541 citation statements)

References 211 publications

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“…As can be seen in the inset, the size of nanoparticles do not exceed 10 nm, which is almost Unauthenticated Download Date | 5/13/18 3:26 AM 4NP, not to its conversion to 4-aminophenol. According to the literature, the smaller the metallic NPs are, the higher catalytic activity they show 2, 3 . Here, the average size obtained from XRD results is c.a 60 nm for Au NPs and 80 nm for Ag NPs, and from SEM images it can be seen, that the size distribution is wide.…”

Section: Study On the Catalytic Performance Of Graphene Hydrogelsmentioning

confidence: 99%

“…Ascorbic acid (AA) was chosen as a reductant of graphene oxide as well as metal ions to form nanoparticles. The previously prepared GO suspension (8 ml, 1 mg/ml) was mixed in a vial with metal precursor, that is HAuCl 4 , AgNO 3 or CuCl 2 and was sonicated for 1 minute. The HAuCl 4 , AgNO 3 or CuCl 2 were weighted in such amounts to keep the same metal content in all hydrogels, that is 1:1 w/w GO to metal.…”

Section: Synthesis Of Graphene Hydrogel/nps Compositesmentioning

confidence: 99%

“…The previously prepared GO suspension (8 ml, 1 mg/ml) was mixed in a vial with metal precursor, that is HAuCl 4 , AgNO 3 or CuCl 2 and was sonicated for 1 minute. The HAuCl 4 , AgNO 3 or CuCl 2 were weighted in such amounts to keep the same metal content in all hydrogels, that is 1:1 w/w GO to metal. After addition of the excess of the reducing agent (32 mg AA) the vials were sealed and heated up in an oil bath up to 90°C.…”

Section: Synthesis Of Graphene Hydrogel/nps Compositesmentioning

confidence: 99%

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Graphene hydrogels with embedded metal nanoparticles as efficient catalysts in 4-nitrophenol reduction and methylene blue decolorization

Żelechowska

Kondratowicz

Gazda

2016

Polish Journal of Chemical Technology

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Synthesis and characterization of the graphene hydrogels with three different metallic nanoparticles, that is Au, Ag and Cu, respectively is presented. Synthesized in a one-pot approach graphene hydrogels with embedded metallic nanoparticles were tested as heterogeneous catalysts in a model reaction of 4-nitrophenol reduction. The highest activity was obtained for graphene hydrogel with Cu nanoparticles and additional reaction of methylene blued degradation was evaluated using this system. The obtained outstanding catalytic activity arises from the synergistic effect of graphene and metallic nanoparticles. The hydrogel form of the catalyst benefi ts in the easiness in separation from the reaction mixture (for example using tweezers) and reusability.

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Section: Study On the Catalytic Performance Of Graphene Hydrogelsmentioning

confidence: 99%

Section: Synthesis Of Graphene Hydrogel/nps Compositesmentioning

confidence: 99%

Section: Synthesis Of Graphene Hydrogel/nps Compositesmentioning

confidence: 99%

See 1 more Smart Citation

Graphene hydrogels with embedded metal nanoparticles as efficient catalysts in 4-nitrophenol reduction and methylene blue decolorization

Żelechowska

Kondratowicz

Gazda

2016

Polish Journal of Chemical Technology

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“…The present model has been designed to describe the well-studied core-shell systems [8,9], but is equally adapted to the study of systems where catalytic centers are embedded in homogeneous microgels [14]. Up to now, most of the experimental work has been done using the reduction of 4-nitrophenol by borohydride ions in aqueous solution [15,16]. This reaction can be regarded as a model reaction [17], since it can be monitored with high precision thus leading to very accurate kinetic data.…”

Section: Introductionmentioning

confidence: 99%

Reaction rate of a composite core–shell nanoreactor with multiple nanocatalysts

Galanti

Fanelli

Angioletti‐Uberti

et al. 2016

Phys. Chem. Chem. Phys.

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We present a detailed theory for the total reaction rate constant of a composite core-shell nanoreactor, consisting of a central solid core surrounded by a hydrogel layer of variable thickness, where a given number of small catalytic nanoparticles are embedded at prescribed positions and are endowed with a prescribed surface reaction rate constant. Besides the precise geometry of the assembly, our theory accounts explicitly for the diffusion coefficients of the reactants in the hydrogel and in the bulk as well as for their transfer free energy jump upon entering the hydrogel shell. Moreover, we work out an approximate analytical formula for the overall rate constant, which is valid in the physically relevant range of geometrical and chemical parameters. We discuss in depth how the diffusion-controlled part of the rate depends on the essential variables, including the size of the central core. In particular, we derive some simple rules for estimating the number of nanocatalysts per nanoreactor for an efficient catalytic performance in the case of small to intermediate core sizes. Our theoretical treatment promises to provide a very useful and flexible tool for the design of superior performing nanoreactor geometries and with optimized nanoparticle load.

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“…[18][19][20][21] Some instances of the use of 4-nitrophenol reduction in previous classical reaction tests to evaluate catalytic properties of many nanosized metals, and similar kinetic studies with silver nanoparticles dispersed in other conducting matrices, are given in the following literature. [22][23][24] The dispersion of silver nanoparticles on nanosized [C 60 ]fullerene nanowhiskers is attractive for catalytic applications. 5,25) Therefore, here, we prepared hybrid nanocomposites with [C 60 ]fullerene nanowhiskers and silver nanoparticles using the liquid-liquid interfacial precipitation (LLIP) method, and investigated the characterization of [C 60 ]fullerene nanowhisker-silver nanoparticle composites and their catalytic activity for reduction of 4-nitrophenol in the presence of sodium borohydride.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Activity for Reduction of 4-Nitrophenol with [C<sub>60</sub>]Fullerene Nanowhisker-Silver Nanoparticle Composites

2016

Mater. Trans.

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Silver nanoparticle solution was prepared by the addition of silver nitrate (AgNO 3 ), trisodium citrate dihydrate (C 6 H 5 Na 3 O 7 ·2H 2 O), sodium borohydride (NaBH 4 ), cetyltrimethyl ammonium bromide ((C 16 H 33 )N(CH 3 ) 3 Br), and ascorbic acid (C 6 H 8 O 6 ), which was subsequently added to distilled water. The resulting solution was subjected to ultrasonic irradiation for 3 h. [C 60 ]fullerene nanowhisker-silver nanoparticle composites were prepared using C 60 -saturated toluene, silver nanoparticle solution, and isopropyl alcohol by the liquid-liquid interfacial precipitation (LLIP) method. The product of [C 60 ]fullerene nanowhisker-silver nanoparticle composites was con rmed by x-ray diffraction, Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. The activity of [C 60 ]fullerene nanowhisker-silver nanoparticle composites as a catalyst was characterized by the reduction of 4-nitrophenol by UV-vis spectroscopy.

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Basic concepts and recent advances in nitrophenol reduction by gold- and other transition metal nanoparticles

Cited by 717 publications

References 211 publications

Graphene hydrogels with embedded metal nanoparticles as efficient catalysts in 4-nitrophenol reduction and methylene blue decolorization

Graphene hydrogels with embedded metal nanoparticles as efficient catalysts in 4-nitrophenol reduction and methylene blue decolorization

Reaction rate of a composite core–shell nanoreactor with multiple nanocatalysts

Catalytic Activity for Reduction of 4-Nitrophenol with [C<sub>60</sub>]Fullerene Nanowhisker-Silver Nanoparticle Composites

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