Fly ash supported Pd–Ag bimetallic nanoparticles exhibiting a synergistic catalytic effect for the reduction of nitrophenol

Maity, Niladri; Sahoo, Anupam; Boddhula, Rajkumar; Chatterjee, Saurav; Patra, Srikanta; Panda, Binod Bihari

doi:10.1039/d0dt01899f

Cited by 19 publications

(11 citation statements)

References 66 publications

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“…400 nm decreased gradually and the intensity of a new peak at ca. 300 nm increased with time, revealing the hydrogenation of 4-NP and the formation of 4-aminophenol (4-AP). ,− After adding 2 mg of SNTs/Pd-Fe/NC, 4-NP in 3 mL of a reaction solution (20 mM) was completely converted into 4-AP in 70 s with NaBH 4 (100 equiv) as a reductant. The activity of SNTs/Pd-Fe/NC was evaluated in a turnover frequency (TOF) value, which was calculated as high as 401.28 min –1 .…”

Section: Resultsmentioning

confidence: 99%

Substrate-Assisted Encapsulation of Pd-Fe Bimetal Nanoparticles on Functionalized Silica Nanotubes for Catalytic Hydrogenation of Nitroarenes and Azo Dyes

Zhang

Qiu

Sun

et al. 2021

ACS Appl. Nano Mater.

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Strengthening the physical and chemical interaction between the metal and support of metal-based catalysts is one of the most effective ways to enhance their catalytic performance in heterogeneous organic catalysis. Therefore, the catalysts may possess high catalytic performance if they are designed as a confined structure, such as a metal species@support material. However, the encapsulation method usually suffers from a complicated preparation route. In this work, an encapsulated bimetallic catalyst is prepared, and its catalytic performance is evaluated in the hydrogenation of nitroarenes and azo dyes. Specifically, with the developed substrate-assisted encapsulation strategy, bimetallic Pd-Fe nanoparticles are facilely trapped between amine-functionalized silica nanotubes (SNTs) and polydopamine (PDA)-derived N-doped carbon (NC) layers. The resultant SNTs/Pd-Fe/NC bimetallic catalyst exhibits excellent catalytic efficiency toward hydrogenation of nitroarenes and azo dyes due to the unique microstructures. Typically, in catalytic reduction of 4-nitrophenol, the turnover frequency is as high as 401.28 min −1 , which is the highest performance among the recently reported noble-metal nanoparticle-based catalysts. Furthermore, the current strategy is beneficial for further design and preparation of active and stable catalysts with broad applications.

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Section: Resultsmentioning

confidence: 99%

Substrate-Assisted Encapsulation of Pd-Fe Bimetal Nanoparticles on Functionalized Silica Nanotubes for Catalytic Hydrogenation of Nitroarenes and Azo Dyes

Zhang

Qiu

Sun

et al. 2021

ACS Appl. Nano Mater.

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“…55 Such shifting of binding energy is indicative of charge transfer between contacting Pd and Ag atoms due to the formation of alloy structure. 19,29,56,57 For the bimetallic Pd−Ag alloy system, Pd and Ag atoms are reported to lose s and p (non-d electrons) but gain d electrons. 58 Such changes in charge distribution in the bimetallic alloy system were reported to be beneficial to achieve better catalytic activity compared with monometallic analogues.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Tuning Pd-to-Ag Ratio to Enhance the Synergistic Activity of Fly Ash-Supported Pd_xAg_y Bimetallic Nanoparticles

Maity,

Mishra,

Barman

et al. 2023

ACS Omega

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Fly ash (FA)-supported bimetallic nanoparticles (Pd x Ag y /FA) with varying Pd:Ag ratios were prepared by coprecipitation of Pd and Ag involving in situ reduction of Pd(II) and Ag(I) salts in aqueous medium. All the supported nanoparticles were thoroughly characterized with the aid of powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), electron microscopy (field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM)), and elemental analyses, which include inductively coupled plasma-optical emission spectroscopy (ICP-OES) and energy-dispersive X-ray spectroscopy (EDS). A gradual broadening and shifting of PXRD peaks, ascribable to Ag, to higher angles with an increase in the Pd:Ag ratio affirms the alloying of interface between Pd and Ag nanoparticles. The coexistence of Pd and Ag was further confirmed by EDS elemental mapping as well as by the presence of bimetallic lattices on the FA surface, as evident from the high-resolution TEM analysis. The dependency of crystallite size and average size of bimetallic nanoparticles on Ag loading (mol %) was elucidated with the help of a combination of PXRD and TEM studies. Based on XPS analysis, the charge transfer phenomenon between contacting Pd−Ag sites could be evident from the shifting of 3d core electron binding energy for both Pd and Ag compared with monometallic Pd and Ag nanoparticles. Following a pseudo-first-order reaction kinetics, all the nanocatalysts were able to efficiently reduce 4-nitrophenol into 4-aminophenol in aqueous NaBH4. The superior catalytic performance of the bimetallic nanocatalysts (Pd x Ag y /FA) over their monometallic (Pd100/FA and Ag100/FA) analogues has been demonstrated. Moreover, the tunable synergistic effect of the bimetallic systems has been explored in detail by varying the Pd:Ag mol ratio in a systematic manner which in turn allowed us to achieve an optimum reaction rate (k = 1.050 min–1) for the nitrophenol reduction using a Pd25Ag75/FA system. Most importantly, all the bimetallic nanocatalysts explored here exhibited excellent normalized rate constants (K ≈ 6000–15,000 min–1 mmol–1) compared with other supported bimetallic Pd–Ag nanocatalysts reported in the literature.

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“…Subsequently, the adsorbed active hydrogen species would attack the nitro (–NO 2 ) group of 4-nitrophenolate following several steps involving successive intermediates such as nitrosophenolate and hydroxyl aminophenolate, thus inducing reduction to the amino group (–NH 2 ). 64…”

Section: Application In Catalytic Reduction Of Nitrophenol and Dye De...mentioning

confidence: 99%

“…Subsequently, the adsorbed active hydrogen species would attack the nitro (-NO 2 ) group of 4-nitrophenolate following several steps involving successive intermediates such as nitrosophenolate and hydroxyl aminophenolate, thus inducing reduction to the amino group (-NH 2 ). 64 Similar to the reduction process of 4-NP, the degradation process of RhB is also an electron transfer phenomenon. Here also, borohydride ions (BH 4…”

Section: Recyclability and Stabilitymentioning

confidence: 99%

Fabrication of tailored rod-shaped carbon nitride, g-C₃N₄, decorated with MoSe₂ flowers for the catalytic reduction of nitrophenol, organic dye degradation and biocompatibility studies

et al. 2022

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Fly ash supported Pd–Ag bimetallic nanoparticles exhibiting a synergistic catalytic effect for the reduction of nitrophenol

Abstract: Coal fly ash (FA) supported Pd-Ag bimetallic nanoparticles (FA-Pd-Ag) was prepared by reducing Pd(II) and Ag(I) salts together onto the dispersed solid support in aqueous medium. Electron microscope analysis (FE-SEM,...

Cited by 19 publications

References 66 publications

Substrate-Assisted Encapsulation of Pd-Fe Bimetal Nanoparticles on Functionalized Silica Nanotubes for Catalytic Hydrogenation of Nitroarenes and Azo Dyes

Substrate-Assisted Encapsulation of Pd-Fe Bimetal Nanoparticles on Functionalized Silica Nanotubes for Catalytic Hydrogenation of Nitroarenes and Azo Dyes

Tuning Pd-to-Ag Ratio to Enhance the Synergistic Activity of Fly Ash-Supported Pd_xAg_y Bimetallic Nanoparticles

Fabrication of tailored rod-shaped carbon nitride, g-C₃N₄, decorated with MoSe₂ flowers for the catalytic reduction of nitrophenol, organic dye degradation and biocompatibility studies

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Fly ash supported Pd–Ag bimetallic nanoparticles exhibiting a synergistic catalytic effect for the reduction of nitrophenol

Abstract: Coal fly ash (FA) supported Pd-Ag bimetallic nanoparticles (FA-Pd-Ag) was prepared by reducing Pd(II) and Ag(I) salts together onto the dispersed solid support in aqueous medium. Electron microscope analysis (FE-SEM,...

Cited by 19 publications

References 66 publications

Substrate-Assisted Encapsulation of Pd-Fe Bimetal Nanoparticles on Functionalized Silica Nanotubes for Catalytic Hydrogenation of Nitroarenes and Azo Dyes

Substrate-Assisted Encapsulation of Pd-Fe Bimetal Nanoparticles on Functionalized Silica Nanotubes for Catalytic Hydrogenation of Nitroarenes and Azo Dyes

Tuning Pd-to-Ag Ratio to Enhance the Synergistic Activity of Fly Ash-Supported PdxAgy Bimetallic Nanoparticles

Fabrication of tailored rod-shaped carbon nitride, g-C3N4, decorated with MoSe2 flowers for the catalytic reduction of nitrophenol, organic dye degradation and biocompatibility studies

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Tuning Pd-to-Ag Ratio to Enhance the Synergistic Activity of Fly Ash-Supported Pd_xAg_y Bimetallic Nanoparticles

Fabrication of tailored rod-shaped carbon nitride, g-C₃N₄, decorated with MoSe₂ flowers for the catalytic reduction of nitrophenol, organic dye degradation and biocompatibility studies