Highly efficient electrochemical and chemical hydrogenation of 4-nitrophenol using recyclable narrow mesoporous magnetic CoPt nanowires

Serrà, Albert; Alcobé, Xavier; Sort, Jordi; Nogués, J.; Vallés, E.

doi:10.1039/c6ta07149j

Cited by 37 publications

(26 citation statements)

References 60 publications

(62 reference statements)

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“…The high hydrogen evolution can dramatically modify the pH on the electrode interface, promoting the formation mainly of azoxybenzene or aniline. Note that acid conditions are required to assure the formation of 4-AP as a result of the nucleophilic attack by water at the protonated 4-HAP [1,20,[34][35][36][37][38][39]. However, the structural elucidation of the formed by-products is out of the scope of the present study as they are formed in non-adequate working conditions for 4-NP reduction.…”

Section: Influence Of the Applied Potentialmentioning

confidence: 95%

“…Literature findings reveal that 4-NP hydrogenation is a viable alternative to produce 4-AP [20,[34][35][36][37][38][39]. With this mind, we have also analyzed the effect of simultaneous hydrogen evolution during the reduction of 4-NP.…”

Section: Influence Of the Applied Potentialmentioning

confidence: 99%

“…Several methods have been proposed for the partial or total oxidation of 4-NP, including microbial catabolism [9,10], photocatalytic degradation [10][11][12][13], biodegradation [14][15][16], Fenton [17,18] and electrochemical methods [19][20][21]. Alternatively, chemical or electrochemical reduction of 4-NP to 4-aminophenol (4-AP in Scheme 1) is also suggested.…”

Section: Introductionmentioning

confidence: 99%

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Simple Environmentally-Friendly Reduction of 4-Nitrophenol

et al. 2020

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The low molecular-mass organic compound 4-nitrophenol is involved in many chemical processes and is commonly present in soils and in surface and ground waters, thereby causing severe environmental impact and health risk. Several methods have been proposed for its transformation (bio and chemical degradation). However, these strategies not only produce equally or more toxic aromatic species but also require harsh operating conditions and/or time-consuming treatments. In this context, we report a comprehensive and systematic study of the electrochemical reduction of 4-nitrophenol as a viable alternative. We have explored the electrochemical reduction of this pollutant over different metallic and carbonaceous substrata. Specifically, we have focused on the use of gold and silver working electrodes since they combine a high electrocatalytic activity for 4-nitrophenol reduction and a low electrocatalytic capacity for hydrogen evolution. The influence of the pH, temperature, and applied potential have also been considered as crucial parameters in the overall optimization of the process. While acidic media and high temperatures favor the clean reduction of 4-nitrophenol to 4-aminophenol, the simultaneous hydrogen evolution is pernicious for this purpose. Herein, a simple and effective electrochemical method for the transformation of 4-nitrophenol into 4-aminophenol is proposed with virtually no undesired by-products.

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Section: Influence Of the Applied Potentialmentioning

confidence: 95%

Section: Influence Of the Applied Potentialmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simple Environmentally-Friendly Reduction of 4-Nitrophenol

et al. 2020

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“…Core-shell structures [156] and multi-segmented magnetic nanowires [137][138][139][140][157][158][159] have been also investigated. Introducing nanoporosity into the architecture of the magnetic nanowires offers the potential to take advantage of magnetism in applications like catalysis or electrocatalysis [158,160].…”

Section: Magnetic Properties Of Nanowiresmentioning

confidence: 99%

Electrodeposition of Iron-Group Alloys into Nanostructured Oxide Membranes: Synthetic Challenges and Properties

Cesiulis

Tsytsaru

Podlaha

et al. 2018

CNANO

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Background: Quasi-one dimensional nanostructures: nanowires, nanotubes, nanorods, nanobelts/nanoribbons and complex "nanowire-nanoparticle" composites have been synthesized over the years. These nanostructures are particularly appealing due to their specific properties defined by their high aspect ratio: two dimensions are in the nanoscale range and one dimension is in the microscale. Methods:One of the well-designed approaches for the synthesis of such nanostructured materials is template-assisted fabrication combined with electrodeposition. The fabrication approaches for the growth of iron-group alloy nanostructures inside nanoporous oxide membranes by means of different electrodeposition techniques, and the resulting unique properties and potential applications of this type of materials are reviewed. Results:Arrays of nanostructures can be obtained by filling a porous oxide template that contains a large number of straight cylindrical, nano-sized diameter holes. Generalities of metals electrodeposition into nanoporous oxide membranes are discussed. Measures to minimize the nonuniformity of deposits inside pores need to be addressed to thin the barrier layer, to control hydrogen evolution and to improve mass transport inside the pores. Examples of binary and ternary iron group alloys grown inside nanoporous oxide templates are provided. Catalytic hydrogen evolution and methanol oxidation on the nanowires arrays are described. The "sample size effect" on the magnetic properties of materials and the electrodeposition of multilayered structures necessary for giant magnetoresistance (GMR) are discussed in details. Conclusion:Electrodeposition of binary and ternary iron-group alloys confirm that controlling alloy composition inside nanopores is still a challenge. composites [7] have been synthesized over the years. These nanostructures are particularly appealing due to their specific properties defined by their high aspect ratio: two dimensions are in the nanoscale range and one dimension is in the microscale. One of the well-designed approaches for the synthesis of such nanostructured materials is template-assisted fabrication combined with electrodeposition, first reported by Possin [8] in track etched mica films, and expanded upon by others with different materials and templates [2,[9][10][11][12][13][14]. However, the self-organized porous anodic aluminum oxide (AAO) membrane has become one of the most often used templates for tunable synthesis of different nanostructured materials [15,16].

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“…For instance, highly mesoporous Co 3 O 4 nanoflakes synthesized applying a microwave-assisted hydrothermal and low-temperature conversion method produced excellent electrochemical performance as an anode in lithium batteries and as an electrocatalyst in the oxygen evolution reaction (OER) [19]. Mesoporous Rh nanoparticles (NPs) fabricated by conducting chemical reduction on polymeric micelles resulted in an improved catalytic performance for the electro-oxidation of methanol [20], and mesoporous Pt-based nanowires (NWs), which were prepared by means of electrodeposition with enhanced catalytic performance for water decontamination [21][22][23] demonstrate the potential of mesoporous materials. Nanostructured materials, especially inorganic, are expected to, therefore, play an important role in fabricating competitive mesoporous catalysts.…”

Section: Introductionmentioning

confidence: 99%

Microemulsion-Based One-Step Electrochemical Fabrication of Mesoporous Catalysts

Serrà

Vallés

2018

Catalysts

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Electrochemical technology has been proposed as an alternative or complementary method to classical inorganic synthesis for the fabrication of effective metallic solid catalysts. Microemulsion-based electrodeposition is a novel, fast, and one-step procedure to obtain mesoporous catalysts with extraordinarily effective areas, which can be used in heterogeneous catalysis for degradation of pollutants and clean energy production. The fabrication process involves conducting microemulsions containing ionic species (dissolved in aqueous solutions) as precursors of the metallic catalysts. The presence of nanometric droplets of organic or ionic-liquid components in the microemulsion defines the mesoporosity of the catalysts during a one-step electrodeposition process. This method also allows the fabrication of metal catalysts as supported mesoporous films or mesoporous nanowires with very high effective areas. Additionally, reactants have excellent accessibility to the overall surface of the catalysts. The different catalysts fabricated with the help of this technology have been tested for competitive degradation of organic pollutants and anodes' materials for fuel cell devices.

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Highly efficient electrochemical and chemical hydrogenation of 4-nitrophenol using recyclable narrow mesoporous magnetic CoPt nanowires

Abstract: Magnetically actuated CoPt nanowires show extraordinary performance for 4-nitrophenol degradation.

Cited by 37 publications

References 60 publications

Simple Environmentally-Friendly Reduction of 4-Nitrophenol

Simple Environmentally-Friendly Reduction of 4-Nitrophenol

Electrodeposition of Iron-Group Alloys into Nanostructured Oxide Membranes: Synthetic Challenges and Properties

Microemulsion-Based One-Step Electrochemical Fabrication of Mesoporous Catalysts

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