Synthesis and catalytic practicality of titania@ITO-grown nanoflakes: an excellent candidate for isopropanol conversion to acetone

Pato, Abdul Hameed; Balouch, Aamna; Talpur, Farah Naz; Abdullah, .; Mahar, Ali Muhammad; Shah, Muhammad Tariq; Kumar, Aneel; Fahad,; Qasim, Sana; Gabole, Asif Ali

doi:10.1007/s13204-019-01200-4

Cited by 13 publications

(5 citation statements)

References 56 publications

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“…Apart from the ELHP, an IPA-acetone fluid pair is also of interest to the fuel cell community, as efficient interconversion of these species is required for the proper functioning of IPA based fuel cells. , Several catalysts that facilitate the oxidation of alcohols to their corresponding carbonyl products have been reported in the literature. , However, most of them require precise temperature, pressure control, and/or the use of expensive bimetallic catalysts. ,− Stable organic nitroxyl radicals, particularly 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO), have emerged as environmentally benign molecular catalysts for the efficient oxidation of alcohols. − In addition, TEMPO and its derivatives are promising catholytes for use in aqueous redox-flow batteries due to their high solubility and redox reversibility . These properties make the organic nitroxyl radical an ideal candidate for potential use in an ELHP.…”

Section: Introductionmentioning

confidence: 99%

Highly Selective TEMPO Catalyzed Bulk Electrooxidation of Isopropanol to Acetone for Application in Electrochemical Heat Pumping

Mishra

Kim

Zorigt

et al. 2023

ACS Sustainable Chem. Eng.

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Air conditioning, space heating, and refrigeration account for approximately 40% of electricity usage in the U.S. residential and commercial building sector. Therefore, the development of more energy efficient heat pump technologies remains an ongoing pursuit with widespread practical implications. Electrochemical looping heat pump (ELHP) technology has emerged as an attractive alternative to conventional vapor compression systems (VCS), theoretically promising significant improvements in both performance and energy consumption. However, efficient ELHPs require selective facilitation of redox reactions that interconvert working fluids with minimal energy input. In this work, we report on the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) mediated oxidation of isopropanol (IPA) to acetone as a promising system for ELHP. We characterized the performance of seven different TEMPO derivatives for mediated electrocatalytic IPA to acetone conversion. 4-Methoxy-TEMPO emerged as the most promising candidate which selectively oxidized IPA to acetone in basic pH as confirmed via electrochemical methods and 13 C NMR. Coupling experimental results with DigiElch simulations helped in characterizing the rate constant for the reaction as 6 M −1 s −1 and a turnover frequency of 3.1 s −1 at pH 10. Bulk electrolysis measurements followed by 13 C NMR highlighted the selectivity of the catalyst (∼100%), even at IPA concentrations as high as 0.5 M IPA, making them ideal for use in practical ELHP. This work introduces a methodology to identify suitable catalysts for efficient ELHP and other bulk conversion methods based on concepts of highly selective mediated electrocatalysis.

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Section: Introductionmentioning

confidence: 99%

Highly Selective TEMPO Catalyzed Bulk Electrooxidation of Isopropanol to Acetone for Application in Electrochemical Heat Pumping

Mishra

Kim

Zorigt

et al. 2023

ACS Sustainable Chem. Eng.

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“…Amongst the various nanostructured heterogeneous photocatalyst, the exceptional ones are metal oxide and metal chalcogenide nanostructures which are broadly exploited for the almost complete degradation and reduction of hazardous dyes and other organic pollutants (Adekunle et al 2020;Fahad et al 2020;Mal et al 2020;Memon et al 2020;Pato et al 2020a;Singh et al 2020a, c). While looking at the brilliant properties of metal oxide nanostructure, the most prominent one is copper oxide (CuO) (Buledi et al 2020b;Chang et al 2011;Sidra et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous kinetics of CuO nanoflakes in simultaneous decolorization of Eosin Y and Rhodamine B in aqueous media

et al. 2021

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This study describes the heterogeneous photocatalysis of CuO nanoflakes for the effective degradation of hazardous dyes. The successful synthesis of CuO nanoflakes was carried out by exploiting aqueous chemical growth method. The synthesized material was characterized by versatile analytical tools including XRD, FE-SEM, EDX, AFM, ZP and FT-IR. The engineered CuO reveals nanoflakes texture having average size of 18.3 nm and (− 36.5 ± 3 mV) surface charge with excellent phase purity and crystalline nature. The catalytic kinetics exposed that CuO nanocatalyst exhibits an exceptional degradation over 97% for Eosin Y (EY) and Rhodamine B (RB) dyes in the aqueous medium using minimum catalyst dose of 120 and 140 μg individually and simultaneously, within 3 min of time period under sunlight. Due to ultrafine processing, cost-effective synthetic outline, supreme reduction percentage in short time and intense recyclability with an insignificant decrease in degradation abilities, the proposed nanocatalyst is extremely useful. Consequentially, the nanocatalyst presented here is more useful and realistic, hence can be suggested as an effective candidate for the successful degradation of complex dyes at the commercial level.

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“…Fabrication of Titania Nanoflakes and Carbon-Based Nanostructure Composites. In the first step, titania nanoflakes (TNFs) were successfully synthesized in accordance with the reported facile and one-pot liquid-phase deposition method 40 and then processed to fabricate GOand RGO-based composite materials. The composites of TNFs with GO and RGO were synthesized via a hydrothermal method following the dispersion of 0.0248 g of GO and 0.487 g of TNFs in a solvent mixture containing 40 mL of DI and 20 mL of ethanol by a magnetic stirrer for 1 h at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Visible-Light-Driven Carbon-Doped TiO₂-Based Nanocatalysts for Enhanced Activity toward Microbes and Removal of Dye

2022

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Solar-driven photocatalytic approach is an attractive, clean, and effective way for decontamination of water. In this work, visible-light-activated TiO 2 nanoflakes (TNFs) and carbondoped TiO 2 nanoflakes (C-TNFs) were synthesized via a facile hydrothermal route using different carbon sources. The assynthesized nanostructures were successfully characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM), critically disclosing the anatase nature containing titanium−oxygen having flake/plateletlike morphology with ∼32 nm in size, respectively. The photocatalytic activity was characterized via the degradation of methylene blue (MB) and bacterial inactivation of Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive). The experimental results showed that C-TNFs significantly enhanced photocatalytic activity compared to bare TNFs. It was found that TNF nanocatalysts exhibited superior photocatalytic activity against photodegradation of MB (92.7%) and antibacterial activity (85.6%) under sunlight irradiation. In addition, reduced graphene oxide (RGO)-TNFs have a good recycling ability and are expected to be a promising candidate for photocatalytic applications under sunlight. Consequentially, the higher activity of RGO-TNF nanocatalysts under sunlight irradiation for organic degradation and bacterial inactivation implies that hydrothermal synthesis allows for the preparation of efficient and low-cost carbon-doped photocatalysts for the photodegradation of a wide range of environmental pollutants.

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Synthesis and catalytic practicality of titania@ITO-grown nanoflakes: an excellent candidate for isopropanol conversion to acetone

Cited by 13 publications

References 56 publications

Highly Selective TEMPO Catalyzed Bulk Electrooxidation of Isopropanol to Acetone for Application in Electrochemical Heat Pumping

Highly Selective TEMPO Catalyzed Bulk Electrooxidation of Isopropanol to Acetone for Application in Electrochemical Heat Pumping

Heterogeneous kinetics of CuO nanoflakes in simultaneous decolorization of Eosin Y and Rhodamine B in aqueous media

Visible-Light-Driven Carbon-Doped TiO₂-Based Nanocatalysts for Enhanced Activity toward Microbes and Removal of Dye

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Synthesis and catalytic practicality of titania@ITO-grown nanoflakes: an excellent candidate for isopropanol conversion to acetone

Cited by 13 publications

References 56 publications

Highly Selective TEMPO Catalyzed Bulk Electrooxidation of Isopropanol to Acetone for Application in Electrochemical Heat Pumping

Highly Selective TEMPO Catalyzed Bulk Electrooxidation of Isopropanol to Acetone for Application in Electrochemical Heat Pumping

Heterogeneous kinetics of CuO nanoflakes in simultaneous decolorization of Eosin Y and Rhodamine B in aqueous media

Visible-Light-Driven Carbon-Doped TiO2-Based Nanocatalysts for Enhanced Activity toward Microbes and Removal of Dye

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Product

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Visible-Light-Driven Carbon-Doped TiO₂-Based Nanocatalysts for Enhanced Activity toward Microbes and Removal of Dye