Effective immobilization of gold nanoparticles on core–shell thiol-functionalized GO coated TiO2 and their catalytic application in the reduction of 4-nitrophenol

Kang, Hyuntae; Kim, Miran; Park, Kang Hyun

doi:10.1016/j.apcata.2015.05.032

Cited by 35 publications

(12 citation statements)

References 47 publications

(42 reference statements)

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“…At present, the reduction of 4-NP to 4-aminophenol (4-AP) is the best method for removing the toxic 4-NP [1]. Nevertheless, the reduction is only possible in the presence of catalysts which are often noble metallic nanoparticles (NPs), such as Pt [2,3], Pd [4,5], Au [6][7][8], and Ag [9][10][11] due to their excellent photoelectric properties. However, the agglomeration of noble metallic NPs during the catalytic reaction is inevitable, which leads to a reduction in activity.…”

Section: Introductionmentioning

confidence: 99%

High-efficient catalytic reduction of 4-nitrophenol based on reusable Ag nanoparticles/graphene-loading loofah sponge hybrid

Liu¹,

Zhao²,

Zhou³

et al. 2018

Nanotechnology

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Noble metal nanoparticles (NPs) such as Au and Ag have shown many applications in the field of catalysis, sensing etc. due to their excellent photoelectric properties. But agglomeration and a low recovery rate are big problems for their applications. In this research, a novel Ag NPs/graphene (reduced graphene oxide)-loading loofah sponge (Ag NPs/RGO-LS) was synthesized through a one-step reduction method. Where the RGO is used as a nano-support with the high specific surface area and the high conductivity to prevent the agglomeration of Ag NPs and provide a conductive layer. The natural, green, low-cost and high-yield LS is designed as a macro-support to reduce the loss of Ag NPs during recycling. The as-prepared Ag NPs/RGO-LS is stable, uniform, and exhibits high efficiency and reusability in the catalytic reduction of 4-nitrophenol (4-NP) with a high rate constant of 1.893 min as well as an average conversion of 98% in 6 min during five cycles. The results have not only paved the way for the wide application of Ag NPs but also provide a new road for the application of other metal NPs.

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Section: Introductionmentioning

confidence: 99%

High-efficient catalytic reduction of 4-nitrophenol based on reusable Ag nanoparticles/graphene-loading loofah sponge hybrid

Liu¹,

Zhao²,

Zhou³

et al. 2018

Nanotechnology

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“…This reaction is easy to follow using UV-Visible spectroscopy. 42 The reaction was started by dissolving 4-nitrophenol (0.208 g, 1.5 mmol) in 10 mL of CH 3 OH : H 2 O (3:7), followed by addition of nickel nanocatalyst (300 mg) and NaBH 4 (0.567 g, 10 equiv. 15 mmol).…”

Section: Uv-vis Study Of the Reduction Reactionmentioning

confidence: 99%

Synthesis, characterization, and application of easily accessible resin-encapsulated nickel nanocatalyst for efficient reduction of functionalized nitroarenes under mild conditions

2018

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A novel resin-encapsulated nickel nanocatalyst has been synthesized by a modified impregnation method using nickel acetate tetrahydrate in presence of sodium borohydride as a mild reducing agent. The synthesized nanocatalyst was characterized by field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The concentration of nickel nanoparticles encapsulated on resin was determined by inductively coupled plasma-mass spectroscopy (ICP-MS). Further, synthesized resinencapsulated nickel nanocatalyst was found to be stable and efficient in micromolar concentrations, for the selective reduction of functionalized nitroarenes to corresponding amines in good to high yield, under mild reaction conditions. The nanocatalyst shows excellent reusability.

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“…4-NP exhibits a strong absorption peak at 317 nm, and in this reaction, 4-NP is changed to the 4-nitrophenolate ion, which absorbs strongly at 400 nm in the presence of NaBH 4 as a hydrogen source [17]. As the reduction of 4-nitrophenol proceeded in the presence of the catalyst, the absorption of the 4-nitrophenolate ion at 400 nm gradually decreased, whereas the new absorption peak at 298 nm increased due to the formation of 4-AP [34]. As shown in Figure 7a, the absorption peak of the 4-nitrophenolate ion decreased in intensity by only 5% even after 24 h, which indicates that the reduction of 4-NP proceeded quite slowly without the catalyst.…”

Section: Catalytic Activity Of Pdo/zno@msio 2 Hybrid Nanocatalystmentioning

confidence: 99%

PdO/ZnO@mSiO2 Hybrid Nanocatalyst for Reduction of Nitroarenes

Kim

Muthuchamy

et al. 2018

Catalysts

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Development of a novel approach for synthesizing nanostructured catalysts and achieving further improvements in catalytic activity, effectiveness, and efficiency remains a major challenge. In this report, we describe the preparation of a nanostructured PdO/ZnO@mSiO 2 hybrid nanocatalyst featuring well-dispersed PdO nanoparticles within hollow ZnO@mSiO 2 . The as-prepared PdO/ZnO@mSiO 2 hybrid nanocatalyst exhibited good morphological features, derived from the controlled stepwise synthesis from Pd/PS@ZIF-8@mSiO 2 (PS = polystyrene). The morphology, size, oxidation state, crystallinity, and thermal stability of the prepared PdO/ZnO@mSiO 2 hybrid nanocatalyst were confirmed by a series of physicochemical techniques. The PdO/ZnO@mSiO 2 hybrid nanocatalyst showed very high catalytic efficiency in the reduction of 4-nitrophenol and various nitroarenes under eco-friendly conditions. Therefore, the PdO/ZnO@mSiO 2 hybrid nanocatalyst is a promising alternative catalyst for applications in environmental remediation.

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Effective immobilization of gold nanoparticles on core–shell thiol-functionalized GO coated TiO2 and their catalytic application in the reduction of 4-nitrophenol

Cited by 35 publications

References 47 publications

High-efficient catalytic reduction of 4-nitrophenol based on reusable Ag nanoparticles/graphene-loading loofah sponge hybrid

High-efficient catalytic reduction of 4-nitrophenol based on reusable Ag nanoparticles/graphene-loading loofah sponge hybrid

Synthesis, characterization, and application of easily accessible resin-encapsulated nickel nanocatalyst for efficient reduction of functionalized nitroarenes under mild conditions

PdO/ZnO@mSiO2 Hybrid Nanocatalyst for Reduction of Nitroarenes

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