Base-catalyzed oxidation of poly (ethylene glycol) by alkaline permanganate: Part I. Kinetics and mechanism of formation of coordination intermediate complex

Hassan, Refat M.; Sayed, Suzan A.; Ibrahim, S. A.

doi:10.1016/j.ejpe.2021.03.005

Cited by 2 publications

(8 citation statements)

References 27 publications

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“…Amber-colored containers were used to store solutions of oxidants prepared. Procedures of preparation and standardization were the same as described earlier. − The required dilution of the stock solution was made before each run.…”

Section: Methodsmentioning

confidence: 99%

“…A model of the Shimadzu UV-2101/3101 PC automated double-beam spectrophotometer was used for the cited kinetic measurements. Since this redox system was relatively slow, concentrations of [poly(ethylene glycol)] ≫ 10[hexacyanoferrate(III)] were maintained to obey pseudo-first-order conditions for such slow reactions, as described elsewhere. − …”

Section: Experimental Workmentioning

confidence: 99%

“…The kinetic measurements were carried out in the same way as before. − Changes obtained in the oxidant [Fe(CN) 6 ] 3– absorbance were recorded as a function of time at a wavelength of 420 nm, which is the absorption maxima of the oxidant. All other components have negligible absorption at this wavelength.…”

Section: Experimental Workmentioning

confidence: 99%

“…Poly(ethylene glycol) is known as a strong reducing agent. Therefore, the kinetics of reduction of some mobile multioxidants such as permanganate ions in either acidic or alkaline solutions, , chromate in acidic media(VI), and cerium(IV) as an oxidant of one-equivalent nature by this reducing agent have been investigated and reported earlier. PEG reduction of chromium(VI) was considered as a new methodology for the purification of wastewater by the simultaneous removal of the carcinogenic Cr(VI) and toxic heavy metal ions from water .…”

Section: Introductionmentioning

confidence: 99%

“…In view of the above arguments and our interest in the kinetics of oxidation of poly(ethylene glycol) by acidic and alkaline permanganate − or reduction of acidic chromate by this reducing agent, the goal of this study is to throw more light on the kinetics and mechanisms of oxidation of PEG as an alcoholic macromolecule using the alkaline ferricyanide(III) complex as an inert oxidant of one-electron transfer as well as to obtain univocal information on the pathway of transfer of electrons and the transition states in rate-determining steps. Again, this study will present some details on the aqueous chemistry of alcoholic macromolecules, particularly PEG, in alkaline media.…”

Section: Introductionmentioning

confidence: 99%

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Mechanistic Approach to the Oxidation of Poly(ethylene glycol) by Potassium Ferricyanide in Basic Media with the Orientation on the Type of Transfer of Electrons in the Absence and Presence of a Ru(III) Catalyst

Hassan

2022

Ind. Eng. Chem. Res.

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A conventional spectrophotometer was used for the kinetic investigation of catalyzed oxidation of water-soluble alcoholic poly(ethylene glycol) (PEG) by hexacyanoferrate(III) in alkaline media at a constant ionic strength of 2.0 mol dm −3 using ruthenium(III) as a catalyzing agent. However, the redox reaction was relatively slow, but the presence of Ru(III) was found to catalyze the reaction to remarkable rates. The pseudo-first-order kinetics indicated a first-order reaction with respect to concentrations of both reactants and second-order overall reaction kinetics without using the catalyzing agent; however, a second-order reaction with respect to the oxidant and a fractional first-order reaction with respect to both poly(ethylene glycol) and alkali concentrations were detected in the presence of the catalyst. When the alkali concentration increased, the oxidation rates increased, which means that the present redox system was of a base-catalyzed nature. Kinetic evidence for the formation of a 1:1 intermediate complex with interference of free radicals in the redox system mechanism was revealed. Pseudo-firstorder rate constant values of 7.85 × 10 −4 s −1 in the absence of the catalyst and 2.95 × 10 −3 in the presence of the catalyst (5 × 10 −5 mol dm −3 ) were evaluated under reaction conditions of [PEG] = 0.2, [Fe(CN) 6 ] 3− = 7 × 10 −4 , [OH − ] = 1.0, and I = 2.0 mol dm −3 at 30 °C. A possible redox system mechanism in the studied oxidation−reduction reaction is proposed and discussed in view of the kinetic results obtained.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Workmentioning

confidence: 99%

Section: Experimental Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanistic Approach to the Oxidation of Poly(ethylene glycol) by Potassium Ferricyanide in Basic Media with the Orientation on the Type of Transfer of Electrons in the Absence and Presence of a Ru(III) Catalyst

Hassan

2022

Ind. Eng. Chem. Res.

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Oxidation and TD-DFT of Toxic Acriflavine Hydrochloride Dye by Potassium Permanganate in Neutral Media: Kinetics and Removal of Dyes from Wastewater

Ibrahim,

Al-Hossainy,

Ali

et al. 2023

J Nanotechnol Nanomaterials

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Fabrication of dye thin films is accomplished through physical vapor deposition with a thickness of 150 ± 5 nm. Kinetically, the reduction of permanganate ion as a multi-equivalent oxidant by acriflavine hydrochloride (ACFH) in a neutral medium has been studied spectrophotometrically. In the presence of a pseudo-first-order reaction, the experimental results suggest fractional first-order kinetics in [ACFH] and a first-order dependency in [MnO4-]. The spectroscopic identification of intermediate species involving complexes of Mn (V) coordination has been examined along with a unique nitro-derivative-ACF (NDACF) synthesis. Based on the estimated activation values, which are in great agreement with the kinetic data obtained, oxidation reaction mechanism was postulated and described. The data exactly determine that ΔEgOpt the amount decreases from 1.566 eV for [ACFH]TF to 1.36 eV for [NDACF]TF for isolated molecules in the gaseous state utilizing TD-DFT model, HOMO and LUMO calculation. The improvements in kinetical and optical properties were achieved, and it is promising to use [NDACF]TF as solar cell application.

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Base-catalyzed oxidation of poly (ethylene glycol) by alkaline permanganate: Part I. Kinetics and mechanism of formation of coordination intermediate complex

Cited by 2 publications

References 27 publications

Mechanistic Approach to the Oxidation of Poly(ethylene glycol) by Potassium Ferricyanide in Basic Media with the Orientation on the Type of Transfer of Electrons in the Absence and Presence of a Ru(III) Catalyst

Mechanistic Approach to the Oxidation of Poly(ethylene glycol) by Potassium Ferricyanide in Basic Media with the Orientation on the Type of Transfer of Electrons in the Absence and Presence of a Ru(III) Catalyst

Oxidation and TD-DFT of Toxic Acriflavine Hydrochloride Dye by Potassium Permanganate in Neutral Media: Kinetics and Removal of Dyes from Wastewater

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