A Diffusion-Kinetic Model for Radiation-Chemical Transformations of Oxalic Acid and Oxalate Ions in Aqueous Solutions

Gordeev, A. V.; Ершов, Б. Г.; Kosareva, I. M.

doi:10.1007/s10733-005-0043-0

Cited by 11 publications

(6 citation statements)

References 19 publications

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“…Radiolytic processes, especially those associated with the formation of excited molecules, dissociative capture of radicals, and oxidation, can lead to the formation of cleavage products of C–C bonds as well as bonds between a carbon and a heteroatom. Under anaerobic conditions, radiolysis eliminates gaseous fragmentation products such as H 2 , CO 2 , CH 4 , N 2 , etc. ,− Under aerobic conditions, organic pollutants can undergo sequential cleavages, leading to their complete conversion to CO 2 and H 2 O or, in the presence of heteroatoms, to oxides of the corresponding elements (SI, section S1). Such a process is called mineralization.…”

Section: Combined Application Of Treatment Methodsmentioning

confidence: 99%

The Green Method in Water Management: Electron Beam Treatment

Пономарев

Ершов

2020

Environ. Sci. Technol.

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During the prebiotic era, radiolytic transformations in the oceans played a key role in purifying water from toxic impurities and, thus, played a role in the formation of the aquatic environment of our planet, making it suitable for the emergence of life. Today, the planet again faces the challenge of how to provide people with clean water. Therefore, it is reasonable to look back at past historical stages and again consider the possibility of neutralizing pollutants in water by means of radiolysis, which has already been tested by time. Modern radiolytic treatments can be much faster and safer thanks to the advent of powerful electron accelerators and high-rate electron beam treatment (ELT) of water and wastewater. Radiolytic treatment of water using accelerated electrons corresponds to the essence of advanced oxidative technologies and green chemistry. The ELT of water instantly generates a high concentration of short-lived radicals that can quickly neutralize and decompose chemical and bacterial pollutants. Due to the ability of accelerated electrons to penetrate into a substance, ELT provides the decomposition of both dissolved and suspended pollutants. The cleaning effect of ELT is due to the ability to inactivate toxic and chromophore functional groups, transform impurities into an easily removable form, damage the DNA of microorganisms and their spore forms, and increase the biodegradability of organic impurities. The use of ELT in water treatment provides significant savings in chemical reagents, thereby improving quality and reducing the number of cleaning steps. The compactness, high degree of automation of the equipment used, energy efficiency, high productivity, and excellent compatibility with traditional water treatment methods are important advantages of ELT. Unlike conventional chemicals, the excess radicals generated in the ELT process are converted back to water and hydrogen; thus, the chemical and corrosive activity of water does not increase. Equipping research institutes with electron accelerators, developing cheaper accelerators, and granting government support for pilot projects are key conditions for introducing ELT into water treatment practice.

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Section: Combined Application Of Treatment Methodsmentioning

confidence: 99%

The Green Method in Water Management: Electron Beam Treatment

Пономарев

Ершов

2020

Environ. Sci. Technol.

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“…The absence of unsaturated bonds in them affects this. However, in this case, the formation of formate and oxalate is fixed also [ 113 , 114 , 115 , 116 , 117 , 118 , 119 ]. These low molecular weight carboxylate compounds, along with H 2 , can play an important role in maintaining subsurface lithoautotrophic microbial ecosystems.…”

Section: Discussionmentioning

confidence: 99%

“…The efficiency of radiation-induced synthesis is also supported by computer simulation of the radiolysis of simple organic compounds—oxalic and acetic acids. It was shown that the decomposition of oxalic acid gives tartaric, tartronic, glyoxylic, and many other organic acids [ 113 , 114 ], while the decomposition of acetic acids gives glycolic and glyoxalic acids, formaldehyde, and other products [ 115 ]. It can be stated, with sufficient certainty, that the radiation-induced chemical transformations of aqueous solutions of CO, CH 4 , HCHO, HCN, and other simple organic compounds makes it possible, in principle, to synthesize an almost infinite set of organic products.…”

Section: Discussionmentioning

confidence: 99%

Natural Radioactivity and Chemical Evolution on the Early Earth: Prebiotic Chemistry and Oxygenation

Ершов

2022

Molecules

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It is generally recognized that the evolution of the early Earth was affected by an external energy source: radiation from the early Sun. The hypothesis about the important role of natural radioactivity, as a source of internal energy in the evolution of the early Earth, is considered and substantiated in this work. The decay of the long-lived isotopes 232Th, 238U, 235U, and 40K in the Global Ocean initiated the oxygenation of the hydro- and atmosphere, and the abiogenesis. The content of isotopes in the ocean and the kinetics of their decay, the values of the absorbed dose and dose rate, and the efficiency of sea water radiolysis, as a function of time, were calculated. The ocean served as both a “reservoir” that collected components of the early atmosphere and products of their transformations, and a “converter” in which further chemical reactions of these compounds took place. Radical mechanisms were proposed for the formation of simple amino acids, sugars, and nitrogen bases, i.e., the key structures of all living things, and also for the formation of oxygen. The calculation results confirm the possible important role of natural radioactivity in the evolution of terrestrial matter, and the emergence of life.

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“…Consequently, detailed knowledge of the processes interlining the radiolysis of oxalic acid which is one of the components of liquid radioactive waste remains still of interest. Radiation chemical degradation of oxalic acid produces long row of organic acids and gaseous products like CO 2 and H 2 [2]. Radiolysis of aqueous solutions of oxalic acid has been previously investigated [2][3][4], but they cover either the initial or late stages of oxalic acid degradation.…”

Section: Introductionmentioning

confidence: 99%

“…Radiation chemical degradation of oxalic acid produces long row of organic acids and gaseous products like CO 2 and H 2 [2]. Radiolysis of aqueous solutions of oxalic acid has been previously investigated [2][3][4], but they cover either the initial or late stages of oxalic acid degradation. However, there is no systematic investigation covering wide range of absorbed irradiation dose, which makes it difficult for proper understanding the mechanism of radiolysis of aqueous oxalic acid solution and consequently the mechanism of complete phenol degradation into CO 2 and H 2 O as well as utilization and safe storage of liquid radioactive waste.…”

Section: Introductionmentioning

confidence: 99%

Radiation-Chemical Degradation of Oxalic Acid in Water Solutions

Gurbanov¹,

Guliyeva²,

Mammadov³

et al. 2015

JCCE

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Abstract:Co 60 gamma ray radiolysis of aqueous oxalic acid solution (1 × 10 -2 M) was investigated within the dose range up to 80kGy. The value of pH increases from 2.0 to 4.0 and approximately 90% of oxalic acid and its derivatives are degraded at the dose of 80 kGy. Dissolved O 2 affects to the degradation of oxalic acid at the initial stage due to total consumption of O 2 at the dose of 2 kGy. Formation of CO 2 occurs at a higher rate at the initial stage until the dissolved O 2 is fully consumed. The kinetic model of oxalic acid degradation in aqueous solution under the gamma irradiation was tested. The suggested mechanism complies with the experimental data both of our own and of that reported earlier.

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A Diffusion-Kinetic Model for Radiation-Chemical Transformations of Oxalic Acid and Oxalate Ions in Aqueous Solutions

Abstract: A diffusion-kinetic model for the radiation-chemical degradation of oxalic acid and oxalates in aqueous solutions was developed. The model adequately describes published data on the formation of H 2 , H 2 O 2 , and CO 2 over wide ranges of acid concentrations and pH values.

Cited by 11 publications

References 19 publications

The Green Method in Water Management: Electron Beam Treatment

The Green Method in Water Management: Electron Beam Treatment

Natural Radioactivity and Chemical Evolution on the Early Earth: Prebiotic Chemistry and Oxygenation

Radiation-Chemical Degradation of Oxalic Acid in Water Solutions

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