Catalytic Reduction of Toxic Nitroarenes in Aqueous Medium Using Worm‐Like Rhodium Nanoparticles

George, Ajith; Selvan, Dhanashree; Mandal, Sukhendu

doi:10.1002/slct.201701643

Cited by 12 publications

(5 citation statements)

References 25 publications

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“…5c), a similar to the trend observed for Pt nanoparticles. 78 As mentioned above, some reports revealed that CO oxidation on hcp Ru nanoparticles begins from oxidation of Ru(001) to a RuO 2 (110) layer, and a subsequent CO oxidation occurs on RuO 2 (110). In a case of fcc Ru nanoparticles, the dominant facet is (111), which has the lowest surface energy.…”

Section: Co Oxidationmentioning

confidence: 97%

“…Very promising catalysts for this process are rhodium nanoparticles (oen supported). [107][108][109][110][111] It is worth mentioning that the reduction of nitro compounds can be oen easily monitored by simple UV-Vis absorption measurements. For example, in a case of reduction of 4-nitrophenol, an initial solution of 4-nitrophenol exhibits pale yellow color (the absorption band at 316 nm).…”

Section: Reduction Reactionsmentioning

confidence: 99%

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Formation and selected catalytic properties of ruthenium, rhodium, osmium and iridium nanoparticles

2022

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Section: Co Oxidationmentioning

confidence: 97%

Section: Reduction Reactionsmentioning

confidence: 99%

Formation and selected catalytic properties of ruthenium, rhodium, osmium and iridium nanoparticles

2022

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“…The reduction process was carried out according to the chemical reactions (4) and ( 5), but the equilibria ( 6) and ( 7) must also be considered, in which either the hydration water of osmium nanoparticles or the one resulting from reaction can participate. The reduction of nitro derivatives with osmium compounds is very well known [32,33,66], but the study of this process on osmium nanoparticles with hydrogen gas is much less approached, the in-situ generation of molecular hydrogen especially with sodium borohydride being preferred [67,68].…”

Section: Reduction Of P-nitrophenol With Molecular Hydrogen With Osmium Nanoparticles-polypropylene Hollow Fibers Composite Membranesmentioning

confidence: 99%

“…The reduction of nitro derivatives with osmium compounds is very well known [32,33,66], but the study of this process on osmium nanoparticles with hydrogen gas is much less approached, the in-situ generation of molecular hydrogen especially with sodium borohydride being preferred [67,68].…”

Section: Reduction Of P-nitrophenol With Molecular Hydrogen With Osmium Nanoparticles-polypropylene Hollow Fibers Composite Membranesmentioning

confidence: 99%

Osmium Nanoparticles-Polypropylene Hollow Fiber Membranes Applied in Redox Processes

et al. 2021

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Composite membranes play a very important role in the separation, concentration, and purification processes, but especially in membrane reactors and membrane bioreactors. The development of composite membranes has gained momentum especially through the involvement of various nanoparticles, polymeric, oxide, or metal, that have contributed to increasing their reactivity and selectivity. This paper presents the preparation and characterization of an active metal nanoparticle-support polymer type composite membrane, based on osmium nanoparticles obtained in situ on a polypropylene hollow fiber membrane. Osmium nanoparticles are generated from a solution of osmium tetroxide in tert-butyl alcohol by reduction with molecular hydrogen in a contactor with a polypropylene membrane. The composite osmium-polypropylene hollow fiber obtained membranes (Os-PPM) were characterized from the morphological and structural points of view: scanning electron microscopy (SEM), high resolution SEM (HR-SEM), energy dispersive spectroscopy analysis (EDAX), X-ray diffraction analysis (XRD), Fourier transform Infrared (FTIR) spectroscopy, thermal gravimetric analysis, and differential scanning calorimetry (TGA, DSC). The process performance was tested in a redox process of p-nitrophenol and 10-undecylenic (10-undecenoic) acid, as a target substance of biological or biomedical interest, in solutions of lower aliphatic alcohols in a membrane contactor with a prepared composite membrane. The characteristics of osmium nanoparticles-polypropylene hollow fiber membranes open the way to biological and biotechnological applications. These membranes do not contaminate the working environment, operate at relatively low temperatures, provide a large contact area between reactants, allow successive oxidation and reduction operations in the same module, and help to recover the reaction mass by ultrafiltration. The results obtained show that the osmium-polypropylene composite membrane allows the reduction of p-nitrophenol or the oxidation of 10-undecylenic acid, the conversion depending on the concentration in the lower aliphatic alcohol, the nature of the lower aliphatic alcohol, and the oxidant or reducing flow through the membrane contactor.

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“…Of course, the hydrogenation of nitro derivatives or related compounds with hydrogen gas in a non-aqueous heterogeneous medium is widely studied and accepted, especially when osmium complexes with various ligands are used as catalysts [65,66]. Also, the reduction of nitro derivatives in aqueous medium with atomic hydrogen (proton and electron) coming from a metal in contact with an acid or base is very much studied [67]. 3).…”

mentioning

confidence: 99%

Reactional Processes on Osmium–Polymeric Membranes for 5–Nitrobenzimidazole Reduction

et al. 2021

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Membranes are associated with the efficient processes of separation, concentration and purification, but a very important aspect of them is the realization of a reaction process simultaneously with the separation process. From a practical point of view, chemical reactions have been introduced in most membrane systems: with on-liquid membranes, with inorganic membranes or with polymeric and/or composite membranes. This paper presents the obtaining of polymeric membranes containing metallic osmium obtained in situ. Cellulose acetate (CA), polysulfone (PSf) and polypropylene hollow fiber membranes (PPM) were used as support polymer membranes. The metallic osmium is obtained directly onto the considered membranes using a solution of osmium tetroxide (OsO4), dissolved in tert–butyl alcohol (t–Bu–OH) by reduction with molecular hydrogen. The composite osmium–polymer (Os–P)-obtained membranes were characterized in terms of the morphological and structural points of view: scanning electron microscopy (SEM), high-resolution SEM (HR–SEM), energy-dispersive spectroscopy analysis (EDAX), Fourier Transform Infra-Red (FTIR) spectroscopy, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The process performance was tested for reduction of 5–nitrobenzimidazole to 5–aminobenzimidazole with molecular hydrogen. The paper presents the main aspects of the possible mechanism of transformation of 5–nitrobenzimidazole to 5–aminobenzimidazole with hydrogen gas in the reaction system with osmium–polymer membrane (Os–P).

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Catalytic Reduction of Toxic Nitroarenes in Aqueous Medium Using Worm‐Like Rhodium Nanoparticles

Cited by 12 publications

References 25 publications

Formation and selected catalytic properties of ruthenium, rhodium, osmium and iridium nanoparticles

Formation and selected catalytic properties of ruthenium, rhodium, osmium and iridium nanoparticles

Osmium Nanoparticles-Polypropylene Hollow Fiber Membranes Applied in Redox Processes

Reactional Processes on Osmium–Polymeric Membranes for 5–Nitrobenzimidazole Reduction

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