Green and practical TEMPO-functionalized activated carbon as a durable catalyst for continuous aerobic oxidation of alcohols

Zhang, Chenghao; huang, Mengmeng; Yin, Jianjun; Lou, Fengyan; Chen, Xingkun; Zhang, Jisong

doi:10.1016/j.jcat.2022.08.010

Cited by 12 publications

(11 citation statements)

References 49 publications

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“…14,94 A nitroxide radical also exhibited a good turnover of over 10 2 as a catalyst for alcohol oxidation. 105 Besides chemical stability, the physical design of electrodes is sometimes crucial. Radical molecules must stay on current collectors in the electrodes of regular batteries, sensors, and catalysts; dissolution in the electrolyte will spoil the redox function.…”

Section: Characterization Of Redox Reactionsmentioning

confidence: 99%

“…Careful design of radical molecules and electrochemical systems enables long-term cyclability of redox systems. For instance, over 1000 charge/discharge cycles were achieved with TEMPO as the active material in redox flow cells (capacity decay of >99.993% per cycle) owing to the bistabilities of the redox couple. , A nitroxide radical also exhibited a good turnover of over 10 2 as a catalyst for alcohol oxidation …”

Section: Introductionmentioning

confidence: 99%

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Redox: Organic Robust Radicals and Their Polymers for Energy Conversion/Storage Devices

Hatakeyama-Sato,

Oyaizu

2023

Chem. Rev.

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Persistent radicals can hold their unpaired electrons even under conditions where they accumulate, leading to the unique characteristics of radical ensembles with open-shell structures and their molecular properties, such as magneticity, radical trapping, catalysis, charge storage, and electrical conductivity. The molecules also display fast, reversible redox reactions, which have attracted particular attention for energy conversion and storage devices. This paper reviews the electrochemical aspects of persistent radicals and the corresponding macromolecules, radical polymers. Radical structures and their redox reactions are introduced, focusing on redox potentials, bistability, and kinetic constants for electrode reactions and electron self-exchange reactions. Unique charge transport and storage properties are also observed with the accumulated form of redox sites in radical polymers. The radical molecules have potential electrochemical applications, including in rechargeable batteries, redox flow cells, photovoltaics, diodes, and transistors, and in catalysts, which are reviewed in the last part of this paper.

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Section: Characterization Of Redox Reactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Redox: Organic Robust Radicals and Their Polymers for Energy Conversion/Storage Devices

Hatakeyama-Sato,

Oyaizu

2023

Chem. Rev.

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“…TON is defined as the number of substrate moles that 1 mol of catalyst can convert into products, whereas TOF is simply computed as TON/reaction time. [ 162,212–230 ]…”

Section: Dye Degradation Using Green (Plant) Mnpsmentioning

confidence: 99%

“…TON is defined as the number of substrate moles that 1 mol of catalyst can convert into products, whereas TOF is simply computed as TON/reaction time. [162,[212][213][214][215][216][217][218][219][220][221][222][223][224][225][226][227][228][229][230] For example, My-Thao and his coworkers [162] biogenically synthesized Au and Ag NPs using waste Passiflora edulis fruit peels. The green spherical NPs were evaluated for catalytic activity against four common dye pollutants (MO, EY, Rh6G, and RhB).…”

Section: Aumentioning

confidence: 99%

Phytogenically bioengineered metal nanoarchitecture for degradation of refractory dye water pollutants: A pragmatic minireview

Emmanuel

Adesibikan

Saliu

2022

Applied Organom Chemis

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The present scenario of water insecurity (poor availability and accessibility to clean and healthy water when needed) denotes the preponderance of environmental damage caused by effluents or waste runoff from industries, such as the dye and textile industries. The polluted waters have led to terrible and sonorous negative impacts on the ecosystem and econetworking, thus, urging for a sustainably suitable substitute to tackle and annul the noxious environmental constraint posse by the hazardous dye effluent. Several chemical and physical methods for treating dye effluent are now in use, but they are time‐consuming, expensive, and inefficient. Interestingly, nanoparticles have egressed as a superior answer for efficient dye removal and degradation, because of their chemical reactivity and exceptional surface characteristics. As a result, the use of metal nanomaterials in the treatment of dye runoffs has been thoroughly investigated. The study used major scientific databases such as SciFinder, Scopus, PubMed, Google Scholar, and Science Direct to conduct a comprehensive review of publicly available literature. Degradation, dye effluent, green metal nanoparticles, and water pollution were the keywords used to find scholarly papers. Efforts were made to figure out and explain the mechanism of dye effluent degradation, how long the degradation will take and how effective the use of plant biosynthesized metal nanoparticles for dye removal is. In addition, the role of bimetallic nanoparticles has also been investigated with remarkable feat from literature. The current level of knowledge about the mechanism and the use of plant biogenic metal nanoparticles in common dye effluent treatment is summarized in this paper.

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“…Therefore, there is an urgent need to investigate and implement environmentally friendly, efficient, and mild oxidants in alcohol oxidation reactions. Recently, stable nitroxide radicals such as 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) have received great attention due to their metal-free, low toxicity, reversible redox behavior, and high efficiency for the selective oxidation of alcohols. − Many alcohol oxidation methods are known for selectively oxidizing primary alcohols to aldehydes or ketones, but the Anelli–Montanari oxidation system is a prominent and widely applied method. , …”

Section: Introductionmentioning

confidence: 99%

TEMPO-Grafted Polystyrene/Polymethacrylate Organosiloxane Janus Nanohybrids as Efficient Pickering Interfacial Catalyst for Selective Aerobic Oxidation of Cinnamyl Alcohol

Mohamad Ali,

Yu,

Tao

et al. 2024

ACS Appl. Mater. Interfaces

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The novel 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) groups immobilized on functional polymers or nanoparticles emerged as potential Pickering interfacial catalysts (PICs) for effective catalysis in biphasic systems. In this study, a snowman-shaped Janus-structured polymer with TEMPO-anchored nanohybrid particles (SM-JPP-TEMPO) was prepared and employed as a potential PIC in the Anelli–Montanari system for the selective oxidation of alcohol. The amphiphilic character of SM-JPP-TEMPO particles plays a dual role as an emulsifier and catalyst in the Pickering emulsion. As a result, it enables smaller droplets (102 μm) at the water-in-oil (W/O) interface and reduces the interfacial tension from 26.58 to 17.38 mN/m, which improves the stability of the Pickering emulsion system. This constructed Pickering emulsion microreactor offers a larger interface contact area and shortens the mass transfer distance of the substrate of cinnamyl alcohol, which significantly enhances the catalytic conversion at the Anelli–Montanari oxidation system, thus achieving remarkable conversion efficiency of (92.3%) with excellent selectivity (99%) in static (stirring-free) condition. It was found that the Janus nanohybrid catalyst (SM-JPP-TEMPO) enhanced 1.29-fold catalytic efficiency compared to the TEMPO grafted spherical polystyrene nanoparticle (PS-NPs-TEMPO) catalyst (72%). Moreover, after seven consecutive cycles, the Janus nanocatalyst (SM-JPP-TEMPO) maintained the conversion significantly. Hence, these results collectively highlight that the amphiphilic SM-JPP-TEMPO catalyst provides an efficient and eco-friendly strategy for the intensification of liquid–liquid biphasic reaction systems for potential applications in industries.

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Green and practical TEMPO-functionalized activated carbon as a durable catalyst for continuous aerobic oxidation of alcohols

Cited by 12 publications

References 49 publications

Redox: Organic Robust Radicals and Their Polymers for Energy Conversion/Storage Devices

Redox: Organic Robust Radicals and Their Polymers for Energy Conversion/Storage Devices

Phytogenically bioengineered metal nanoarchitecture for degradation of refractory dye water pollutants: A pragmatic minireview

TEMPO-Grafted Polystyrene/Polymethacrylate Organosiloxane Janus Nanohybrids as Efficient Pickering Interfacial Catalyst for Selective Aerobic Oxidation of Cinnamyl Alcohol

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