Effect of particle size and alloying with different metals on 57Fe Mössbauer spectra

Nazir, Rabia; Mazhar, Muhammad; Siddique, M.; Hussain, Syed Tajammul

doi:10.1007/978-3-642-01370-6_10

Cited by 2 publications

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References 20 publications

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“…[33] The doublet is attributed to finer particles in the samples undergoing superparamagnetic relaxation whereas the sextet is assigned to larger particles in the samples showing hyperfine splitting. A similar spectral pattern consisting of a ferromagnetic sextet and superparamagnetic doublet was also observed by Nazir et al [34] for bimetallic FeÀPd system. The significant change observed in the values of IS of S2 as compared to S1 may be attributed to the variation in electron density of the Mö ssbauer nuclide upon amalgamation with Pd, thus corroborating with HRTEM and UV-visible spectroscopic studies.…”

Section: Synthesis and Characterizationsupporting

confidence: 85%

Sustainable Redox Chemistry Route to Multifaceted Fe‐Pd Heteronanostructure: Delving into the Synergistic Influence in Catalysis

Pramanik

Das

et al. 2017

ChemistrySelect

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The biomimetic concept to decipher the ‘enigma of metalloenzymes’ in integrating two metals in designing a heteronanostructure with multifunctional attributes seems inspiring. In this pursuit, we report a versatile route to Fe−Pd heteronanostructure based on the redox chemistry utilizing the galvanic potentials of the metals, in lieu of an external reducing agent used so far. The synergism between two metal centers has been delved into for multifaceted catalytic applications. The synthesized nanomaterial has been extensively characterized by techniques such as UV‐Vis, FTIR, XRD, SEM‐EDX, HRTEM, BET, VSM, ICP and Mössbauer spectroscopy. The formation of the heteronanostructure with Fe and Pd is clearly evident from HRTEM image and EDS mapping analysis. Mössbauer spectra are consistent with the superparamagnetic nature of the material. Fe−Pd heteronanostructure showed excellent aqueous‐phase catalytic activities for Suzuki coupling reactions with challenging substrates like heteroaryl bromides and aryl chlorides, and reductions of 4‐nitrophenol to 4‐aminophenol and Cr(VI) to Cr(III). Interestingly, in all the three catalytic reactions, Fe−Pd heteronanostructure showed superior activity over its monometallic counterpart substantiating to the cooperative influence of the two metals. Low catalyst loading, shorter reaction times, ‘in water’ reactions for synthesis and catalysis and magnetic recyclability form the hallmark features of the heteronanostructure.

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Section: Synthesis and Characterizationsupporting

confidence: 85%

Sustainable Redox Chemistry Route to Multifaceted Fe‐Pd Heteronanostructure: Delving into the Synergistic Influence in Catalysis

Pramanik

Das

et al. 2017

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High-Density Ultra-small Clusters and Single-Atom Fe Sites Embedded in Graphitic Carbon Nitride (g-C₃N₄) for Highly Efficient Catalytic Advanced Oxidation Processes

et al. 2018

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Ultra-small metal clusters have attracted great attention owing to their superior catalytic performance and extensive application in heterogeneous catalysis. However, the synthesis of high-density metal clusters is very challenging due to their facile aggregation. Herein, one-step pyrolysis was used to synthesize ultra-small clusters and single-atom Fe sites embedded in graphitic carbon nitride with high density (iron loading up to 18.2 wt %), evidenced by high-angle annular dark field-scanning transmission electron microscopy, X-ray absorption spectroscopy, X-ray photoelectron spectroscopy, and Fe Mössbauer spectroscopy. The catalysts exhibit enhanced activity and stability in degrading various organic samples in advanced oxidation processes. The drastically increased metal site density and stability provide useful insights into the design and synthesis of cluster catalysts for practical application in catalytic oxidation reactions.

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Effect of particle size and alloying with different metals on 57Fe Mössbauer spectra

Cited by 2 publications

References 20 publications

Sustainable Redox Chemistry Route to Multifaceted Fe‐Pd Heteronanostructure: Delving into the Synergistic Influence in Catalysis

Sustainable Redox Chemistry Route to Multifaceted Fe‐Pd Heteronanostructure: Delving into the Synergistic Influence in Catalysis

High-Density Ultra-small Clusters and Single-Atom Fe Sites Embedded in Graphitic Carbon Nitride (g-C₃N₄) for Highly Efficient Catalytic Advanced Oxidation Processes

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Effect of particle size and alloying with different metals on 57Fe Mössbauer spectra

Cited by 2 publications

References 20 publications

Sustainable Redox Chemistry Route to Multifaceted Fe‐Pd Heteronanostructure: Delving into the Synergistic Influence in Catalysis

Sustainable Redox Chemistry Route to Multifaceted Fe‐Pd Heteronanostructure: Delving into the Synergistic Influence in Catalysis

High-Density Ultra-small Clusters and Single-Atom Fe Sites Embedded in Graphitic Carbon Nitride (g-C3N4) for Highly Efficient Catalytic Advanced Oxidation Processes

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High-Density Ultra-small Clusters and Single-Atom Fe Sites Embedded in Graphitic Carbon Nitride (g-C₃N₄) for Highly Efficient Catalytic Advanced Oxidation Processes