Oxidation of limonene using activated carbon modified in dielectric barrier discharge plasma

Glonek, Karolina; Wróblewska, Agnieszka; Makuch, Edyta; Ulejczyk, Bogdan; Krawczyk, Krzysztof; Wróbel, Rafał; Koren, Zvi; Michalkiewicz, Beata

doi:10.1016/j.apsusc.2017.05.136

Cited by 31 publications

(13 citation statements)

References 26 publications

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“…Further, it is more intense than the G band, indicating there to be a large amount of highly disordered graphite (Bielza et al, 1999). The G band, in contrast, corresponds to graphitic carbon, which is more ordered, symmetrical, and crystalline (Cheng et al, 2016;Glonek et al, 2017). Figure 2 shows the FTIR spectrum for each of the activated carbons.…”

Section: Characterization Of the Active Carbons Producedmentioning

confidence: 99%

RETRACTED: Preparation and characterization of activated carbons from winemaking wastes and their adsorption of methylene blue

Alcaraz

Fernández

García‐Díaz

et al. 2018

Adsorption Science & Technology

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This work reports the preparation of activated carbons via the hydrothermal treatment at 523 K/30 bar of two common winemaking wastes: bagasse and cluster stalks. The hydrothermal carbons produced by the above treatment were turned into activated carbons via their exposure to KOH and carbonization at 1073 K. These were then subjected to Raman spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy examination, and the determination of their Brunauer-Emmett-Teller surface area. The ability of the activated carbons to adsorb methylene blue in aqueous solution was then examined, determining the influence of time, methylene blue concentration, and temperature. Equilibrium conditions were reached for reaction times between 180 and 240 min at pH 7. The adsorption isotherms were found to better fit the Langmuir than the Freundlich model, and the adsorption kinetics fitted a pseudo-second-order model. The maximum adsorption at 303 K was 714-847 mg g À1. Thermodynamic studies revealed the adsorption of methylene blue to be spontaneous and exothermic. These results show that high-quality activated carbons can be produced from winemaking waste.

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Section: Characterization Of the Active Carbons Producedmentioning

confidence: 99%

RETRACTED: Preparation and characterization of activated carbons from winemaking wastes and their adsorption of methylene blue

Alcaraz

Fernández

García‐Díaz

et al. 2018

Adsorption Science & Technology

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“…The catalyst landscape is a hostile environment and is subjected to bombardment by ionised and energetic species including electrons and this will affect how the catalyst and its adsorbed species survive. It is well established that catalysts can be pre-treated by exposure to plasma for subsequent use in conventional thermal processing [44][45][46]. For example, using a low pressure glow discharge or radio frequency plasma with Ar, He, N 2 or air as a source of energetic electrons, it is possible to reduce a metal catalyst [47,48].…”

Section: The Catalytic Landscape As Seen By a Plasma Dischargementioning

confidence: 99%

Plasma-catalysis: Is it just a question of scale?

Whitehead

2019

Front. Chem. Sci. Eng.

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The issues of describing and understanding the changes in performance that result when a catalyst is placed into plasma are discussed. The different chemical and physical interactions that result and how their combination might produce beneficial results for the plasma-catalytic processing of different gas streams are outlined with particular emphasis being placed on the different range of spatial and temporal scales that must be considered both in experiment and modelling. The focus is on non-thermal plasma where the lack of thermal equilibrium creates a range of temperature scales that must be considered. This contributes in part to a wide range of inhomogeneity in different properties such as species concentrations and electric fields that must be determined experimentally by in situ methods and be incorporated into modelling. It is concluded that plasmacatalysis is best regarded as conventional catalysis perturbed by the presence of a discharge, which modifies its operating conditions, properties and outcomes often in a very localised way. The sometimes used description "plasma-activated catalysis" is an apt one.

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“…According to literature reported data, the orange essential oil spectrum obtained in SE displays, for limonene (LIM), a peak at 274 [ 34 , 35 ] followed by a smaller one at 252 nm (the first row from Table 1 ). The splitting of absorption maximum can be caused especially by the appearance of hydrophobic interactions and/or due to the limonene susceptibility to oxidation, during storage, at one or both double bonds leading to the formation of some compounds such as oxides, peroxides, or alcohols [ 36 , 37 ].…”

Section: Resultsmentioning

confidence: 99%

Interactions of Some Chemotherapeutic Agents as Epirubicin, Gemcitabine and Paclitaxel in Multicomponent Systems Based on Orange Essential Oil

et al. 2021

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In order to anticipate the effect induced by a natural product on the chemical activity of medicines simultaneously administered, spontaneous interactions of certain cancer treatment drugs such as, epirubicin (EPR), gemcitabine (GCT), and paclitaxel (PTX) with limonene (LIM)—a natural compound extracted from orange peel and known as an anticancer agent—were investigated. To estimate the stability of the drugs over time, a current density of 50 mA cm−2 was applied as an external stimulus between two platinum electrodes immersed in hydrochloric acid solution containing ethyl alcohol/water in the volume ratio of 2/3, in the absence and presence of orange essential oil (limonene concentration of 95%). The concentration variation of chemotherapeutic agents over time was evaluated by UV-Vis spectrophotometry. Kinetic studies have shown a delay in the decomposition reaction of epirubicin and gemcitabine and a paclitaxel activity stimulation. Thus, in the presence of limonene, the epirubicin half-life increased from 46.2 min to 63 min, and from 6.2 min to 8.6 min in gemcitabine case, while for paclitaxel a decrease of half-life from 35.9 min to 25.8 min was determined. Therefore, certain drug-limonene interactions took place, leading to the emergence of molecular micro-assemblies impacting decomposition reaction of chemotherapeutics. To predict drug–limonene interactions, the Autodock 4.2.6 system was employed. Thus, two hydrophobic interactions and five π-alkyl interactions were established between EPR-LIM, the GCT-LIM connection involves four π-alkyl interactions, and the PTX-LIM bridges take place through three hydrophobic interactions and the one π-alkyl. Finally, the decomposition reaction mechanism of drugs was proposed.

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Oxidation of limonene using activated carbon modified in dielectric barrier discharge plasma

Cited by 31 publications

References 26 publications

RETRACTED: Preparation and characterization of activated carbons from winemaking wastes and their adsorption of methylene blue

RETRACTED: Preparation and characterization of activated carbons from winemaking wastes and their adsorption of methylene blue

Plasma-catalysis: Is it just a question of scale?

Interactions of Some Chemotherapeutic Agents as Epirubicin, Gemcitabine and Paclitaxel in Multicomponent Systems Based on Orange Essential Oil

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