Copper nanoparticles grafted on carbon microspheres as novel heterogeneous catalysts and their application for the reduction of nitrophenol and one-pot multicomponent synthesis of hexahydroquinolines

Pasinszki, Tibor; Krebsz, Melinda; Lajgut, Győző György; Kocsis, Tünde; Kótai, László; Kauthale, Sushama S.; Tekale, Sunil U.; Pawar, Rajendra P.

doi:10.1039/c7nj03562d

Cited by 48 publications

(24 citation statements)

References 20 publications

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“…The Cu-NP/C catalyst was prepared as described in our previous papers. 35,37 General procedure for the synthesis of spirooxoindole derivatives:…”

Section: Methodsmentioning

confidence: 99%

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A ONE POT THREE-COMPONENT SYNTHESIS OF SPIROOXOINDOLES USING Cu-NANOPARTICLES GRAFTED ON CARBON MICROSPHERES AS CATALYST

Kaminwar¹,

Patwari²,

Goskulwad³

et al. 2019

ECB

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The copper nanoparticles grafted on carbon microsphere is employed for an efficient one-pot three-component synthesis of spirooxoindole derivatives involving isatin, malononitrile and enolizable ketones such as 3-methyl-1-phenyl-2-pyrazolin-5-one, 3-methyl-1-(2chlorophenyl)-2-pyrazoline 5-one, 4-hydroxy-6-methyl-2-pyrone and 1-methyl-4-hydroxyquinoline-2-one. The cheap starting material, easy separation, high catalytic efficiency and reusability of the catalyst for several times without loss of its efficiency, good yield of products, and simple workup are promising features of the reaction in 1:1 (v/v) aqueous-alcoholic medium.

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“…The Cu-NP/C catalyst was prepared as described in our previous papers. 35,37 General procedure for the synthesis of spirooxoindole derivatives:…”

Section: Methodsmentioning

confidence: 99%

“…copper nanoparticles grafted on carbon microsphere find alternatives to these problems. 35,36 In the present work, an effective, copper nanoparticle grafted on carbon microsphere catalysed method for the one-pot synthesis of spirooxoindole derivatives in aqueous ethanol is reported herein (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

A ONE POT THREE-COMPONENT SYNTHESIS OF SPIROOXOINDOLES USING Cu-NANOPARTICLES GRAFTED ON CARBON MICROSPHERES AS CATALYST

Kaminwar¹,

Patwari²,

Goskulwad³

et al. 2019

ECB

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“…4-nitrophenol is typically removed from the wastewater by various processes including adsorption, degradation, and electrochemical treatment, and so on [29]. On the other hand, the catalytic reduction of 4-nitrophenol and other nitro-aromatics to amino-phenols has gained significant interest in the scientific community [30]. The catalytic reduction of nitrophenols to amino-phenols is an important class of reaction due to the significance of amino-phenols as intermediates in various processes [31].…”

Section: Catalytic Properties Of Au-zromentioning

confidence: 99%

Facile Sonochemical Preparation of Au-ZrO2 Nanocatalyst for the Catalytic Reduction of 4-Nitrophenol

et al. 2020

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High-intensity ultrasonic waves have great potential for the green synthesis of various nanomaterials under mild conditions and offer an excellent alternative for hazardous chemical methods. Herein a facile approach for the eco-friendly synthesis of Au-ZrO2 nanocatalyst with a high catalytic activity using a facile ultrasonic method is presented. Gold (Au) in the nanosize regime was successfully deposited on the surface of solvothermally synthesized monodispersed ZrO2 nanoparticles (ZrO2 NPs) in a very short period of time (5 min) at room temperature. Spherical shape small size Au nanoparticles that are uniformly dispersed on the surface of ZrO2 nanoparticles were obtained. Notably, in the absence of ZrO2 nanoparticles, HAuCl4 could not be reduced, indicating that nano-sized ZrO2 not only acted as support but also helped to reduce the gold precursor at the surface. The as-prepared Au-ZrO2 nanocatalyst was characterized by various techniques. The Au-ZrO2 nanocatalyst served as a highly efficient reducing catalyst for the reduction of 4-nitrophenol. The reaction time decreased with increasing the amount of catalyst.

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“…The loaded resin, 2-3 grams placed into a porcelain combustion boat, was carbonized in a very slow, high-purity nitrogen stream in a horizontally aligned quartz tube using a tube furnace (see also Refs. [14,15] for more details). The furnace was heated up to the desired temperature in 30 min, kept at this temperature for 4 h, and then left to cool down naturally.…”

Section: Experimental Materials and Synthesis Of Carbon Microspheresmentioning

confidence: 99%

“…All post-treatments have been rejected in this work for cost efficiency; therefore, surface functionalization and carbon matrix generation have been designed to occur simultaneously in one step. Since we have observed recently that appropriately cross-linked polystyrene-based ion exchange resins retain their spherical shape during carbonization [14,15], an iminodiacetate-functionalized resin was used as the carbon source in our current work. Saturating this resin with a trivalent metal cation requires the presence of a counteranion in the matrix for charge balance; therefore, we expected that saturation with iron(III) sulfate would provide both the sulfur and iron sources for iron sulfide nanoparticle (NP) formation both in the body and more importantly on the surface of carbon microspheres.…”

Section: Introductionmentioning

confidence: 99%

Carbon microspheres decorated with iron sulfide nanoparticles for mercury(II) removal from water

et al. 2019

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A new and simple method is developed to synthesize carbon microspheres decorated with iron sulfide nanoparticles for mercury ion removal from water. The synthesis is based on carbonizing polystyrene–divinylbenzene-based and iron(III) sulfate-loaded cation exchange resins between 500 and 1000 °C. The phase composition, surface area, and morphology of these materials are characterized by various spectroscopic and diffraction techniques, including Mössbauer spectroscopy, powder X-ray diffraction, Raman and scanning electron microscopy, and BET analysis. Pyrrhotite is found to be the dominant iron-containing phase. The adsorption performance of microspheres for mercury ion removal from water is studied as a function of adsorbent load and contact time at pH 6.5 using a solution of 40 mg dm−3 mercury ion. Pyrrhotite nanoparticles played a key role in mercury ion removal amounting to 70–90% of the extracted amount. A high adsorption capacity of 104 mg of mercury/g of adsorbent at an adsorbent load of 0.33 g dm−3 is achieved, and the removal kinetics could be well fitted with a pseudo-second-order kinetic model, indicating chemical sorption. The synthetic method is easy to scale up for large-scale production and materials are easy to handle, which is significant for large-scale environmental applications.

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Copper nanoparticles grafted on carbon microspheres as novel heterogeneous catalysts and their application for the reduction of nitrophenol and one-pot multicomponent synthesis of hexahydroquinolines

Abstract: Carbon microsphere-supported Cu nanoparticles were fabricated, characterized, and applied for synthesis.

Cited by 48 publications

References 20 publications

A ONE POT THREE-COMPONENT SYNTHESIS OF SPIROOXOINDOLES USING Cu-NANOPARTICLES GRAFTED ON CARBON MICROSPHERES AS CATALYST

A ONE POT THREE-COMPONENT SYNTHESIS OF SPIROOXOINDOLES USING Cu-NANOPARTICLES GRAFTED ON CARBON MICROSPHERES AS CATALYST

Facile Sonochemical Preparation of Au-ZrO2 Nanocatalyst for the Catalytic Reduction of 4-Nitrophenol

Carbon microspheres decorated with iron sulfide nanoparticles for mercury(II) removal from water

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