Degradation of H-acid and its derivative in aqueous solution by ionising radiation

Pálfi, T.; Takács, Erzsébet; Wojnárovits, László

doi:10.1016/j.watres.2007.03.018

Cited by 17 publications

(6 citation statements)

References 12 publications

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“…In wastewater of a multicomponent composition, oxidizing and reducing products of water radiolysis, as a rule, make an additive contribution to the neutralization of pollutants. , A decrease in the toxicity of pollutants is achieved mainly due to the elimination of functional groups, such as −Cl, −NO 2 , −SH, and others. ,− An important role in this elimination is played by the dissociative capture of a hydrated electron (Figure ). The removal of functional groups and the addition of radicals to double bonds (decomposition of the conjugated bonds system, Figure ) is important from the point of view of bleaching pollutants. ,,− The same processes, along with the oxidation and fragmentation of molecules, contribute to an increase in the biodegradability of pollutants. ,− …”

Section: Reactive Radiolysis Productsmentioning

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: Reactive Radiolysis Productsmentioning

confidence: 99%

The Green Method in Water Management: Electron Beam Treatment

Пономарев

Ершов

2020

Environ. Sci. Technol.

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“…These G values are the yields of primary intermediates in mol/J. They can then take part in many different reactions with the solute molecule thereby causing a change in its composition [52]:…”

Section: Radiolysis Of Aqueous Solutionsmentioning

confidence: 99%

Radiation induced degradation of dyes—An overview

Rauf

Ashraf

2009

Journal of Hazardous Materials

247

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“…The radiolysis of water is very well documented and it has been known that it produces (H 2 ), (H 2 O 2 ), (H + ), (OH − ) besides hydrated electron (e aq − ), hydroxyl radical ( · OH) and hydrogen atom ( · H) as intermediate species in varying amounts depending upon the linear energy transfer value of the radiation. [10] In dilute solutions the yield of these species are as follows: G(e aq − ) = G( · OH) = 0.28 and G( · H) = 0.06 μmol/J. These intermediates can then take part in many different reactions with the solute molecule (in our case MB) thereby causing a change in its composition [11] The hydrated electron (e aq − ) and the hydrogen radical ( · H) are the main reductive species produced in irradiated aqueous solution, whereas, the hydroxyl radicals ( · OH) and perhydroxyl radicals ( · HO 2 , produced in subsequent reactions) are the main oxidizing species produced in water radiolysis.…”

Section: Degradation Of Methylene Blue In the Absence Of Tio 2 311 mentioning

confidence: 99%

“…In water treatment processes, TiO 2 shows non-toxicity and insolubility, both in the dark and on illumination, which are important considerations. [10]. Figure 2 shows the principle of photodegradation of organic compounds using a photocatalyst.…”

Section: Introductionmentioning

confidence: 99%

Gamma-Ray Induced Catalytic Degradation of Methylene Blue in Aqueous Suspension of Titania

Twfik

Baraka

El-Sayed

et al. 2010

The International Conference on Chemical and Environmental Engi

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Gamma radiation-induced degradation of methylene blue (MB) in aqueous solution was studied for two groups: one with suspension of Titania, TiO 2 , photo-catalyst and the other without it. Degradation of methylene blue by gamma-rays (doses range: 200-1000 Gy) was investigated by measuring the change of absorbance spectrophotometrically at λ max = 661 nm. Initial pH of solution (values 5, 7 and 9) was considered as a basic factor to study. The changes of pH values for irradiated methylene blue solutions with respect to gamma dose were recorded. Post irradiation effect was determined by measuring absorbance after 24 hours. For both groups, the color of methylene blue was bleached gradually with dose indicating its degradation. It was found that presence of TiO 2 causes more bleaching. Also, as initial pH increases, the degradation increases. Methylene blue IR spectra, before and after irradiation, were recorded to investigate the effect of gamma radiation on MB.

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Degradation of H-acid and its derivative in aqueous solution by ionising radiation

Cited by 17 publications

References 12 publications

The Green Method in Water Management: Electron Beam Treatment

The Green Method in Water Management: Electron Beam Treatment

Radiation induced degradation of dyes—An overview

Gamma-Ray Induced Catalytic Degradation of Methylene Blue in Aqueous Suspension of Titania

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