Gamma radiolytic degradation of 3,4-dichloroaniline in aqueous solution

Huang, Danni; Wang, Zhengfang; Zhang, Jianhua; Feng, Jingwei; Zhang, Zheng; Zhang, Jibiao

doi:10.1016/j.seppur.2016.06.052

Cited by 10 publications

(2 citation statements)

References 42 publications

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“…The DCA has two functional groups (chlorine and amine) and an aromatic ring. Chloro-organic compounds form an important class of pollutants. , Many industrial effluent streams contain phenol/aniline, as these two serve as a precursor to many pharmaceutical/chemical manufacturing processes. The derivative compounds of dichloroaniline find its use in the production of dyes and herbicides .…”

Section: Comparison Of Hc Devicesmentioning

confidence: 99%

Comparison of Hydrodynamic Cavitation Devices Based on Linear and Swirling Flows: Degradation of Dichloroaniline in Water

Sarvothaman

Simpson

Ranade

2020

Ind. Eng. Chem. Res.

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Hydrodynamic cavitation (HC) is being increasingly used for a wide range of applications including wastewater treatment. No systematic comparison of pollutant degradation performance of different HC devices is available. In this work, for the first time: a basis for comparing performance of HC devices and a systematic comparison of pollutant degradation performance of five different types of HC devices based on linear and swirling flows is presented. 2,4-Dichloroaniline (DCA) was selected as a model pollutant in water as it contains multiple functional groups on an aromatic ring. Experiments were performed at two values of pressure drop across HC devices (100 and 200 kPa) at a constant initial concentration (35 ppm), pH (7), and temperature (18 °C) for five types of HC devices, namely orifice, venturi, orifice with swirl, venturi with swirl, and vortex diode. The pollutant degradation was interpreted by a per-pass degradation factor approach. The study demonstrated that five different types of cavitation devices performed similar to each other when these devices were designed to exhibit a similar pressure drop versus flow rate curve. It was conclusively shown that swirl does not suppress degradation performance while offering advantages on shielding device walls from collapsing cavities. This is an important and new result which will be useful for selecting and designing cavitation devices. Pollutant degradation data for geometrically similar vortex diodes of two smaller scales showed significantly higher degradation performance. The number of passes required for ∼10% degradation for the devices with a nominal capacity of 1, 5, and 20 LPM were 15, 100, and 1200 passes, respectively. The presented experimental data from these seven devices will be useful for evaluating computational models and hopefully stimulate further development of predictive computational models in this challenging area.

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Section: Comparison Of Hc Devicesmentioning

confidence: 99%

Comparison of Hydrodynamic Cavitation Devices Based on Linear and Swirling Flows: Degradation of Dichloroaniline in Water

Sarvothaman

Simpson

Ranade

2020

Ind. Eng. Chem. Res.

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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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Current research on high‐energy ionizing radiation for wastewater treatment and material synthesis

Jiang

Iwahashi

2019

Env Prog and Sustain Energy

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High‐energy ionizing radiation (HEIR) can be a powerful tool for wastewater treatment and material synthesis in industry owing to its strong ionization ability. However, deficiencies in research data have limited the further use of the HEIR method. This review discusses the research data accumulated within the past 10 years for the application of gamma irradiation, X‐rays, and ion and electron beams. Each section contains a discussion on the effective HEIR doses and possible available mechanisms. This article reviews the most recent information and highlights issues for future investigation, for the purpose of promoting the full use of HEIR technology in industry.

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Gamma radiolytic degradation of 3,4-dichloroaniline in aqueous solution

Cited by 10 publications

References 42 publications

Comparison of Hydrodynamic Cavitation Devices Based on Linear and Swirling Flows: Degradation of Dichloroaniline in Water

Comparison of Hydrodynamic Cavitation Devices Based on Linear and Swirling Flows: Degradation of Dichloroaniline in Water

The Green Method in Water Management: Electron Beam Treatment

Current research on high‐energy ionizing radiation for wastewater treatment and material synthesis

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