Decoloration and degradation of an anthraquinone dye aqueous solution in flow system using an electron accelerator

Hirano, Shoji; Miyata, Teijiro; Suzuki, Nobutake; Kawakami, Waichiro

doi:10.1016/0146-5724(79)90057-8

Cited by 20 publications

(11 citation statements)

References 9 publications

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“…The drop in the pH of the pesticide solutions may be attributed to the mechanism of the radiation degradation process taking place in the studied system in which acids were detected as degradation products of the pesticide molecules to lower molecular weight compounds (such as acids) [7,9,10]. Many previous studies by several authors (10,11,(14)(15)(16)(17) of wastewater treatment by irradiation, has shown that radiation treatment of large volumes of waste effluents tends to be incomplete and uneconomic. A more promising approach involving radiation treat-ment of wastewater arises when a combined treatment of irradiation and a conventional method can be applied to relatively dilute waste solutions.…”

Section: Radiation Degradation Of Pesticidesmentioning

confidence: 98%

“…In most cases the radiation degradation of the pesticides was higher in the acidic medium followed by that in neutral medium and the degradation carried out in alkaline medium proceeded in the least degree. The irradiation of the pesticide solutions with gamma radiation leads to the formation of radicals and molecular products formed from the radiolysis of water [12][13][14]. According to Suzuki et al [15,16] who reported that in addition to the primary OH radicals, these species (HO2 and 02) contribute to the degradation process and that this process in the presence of oxygen leads to the formation of peroxides which contribute also to the degradation reactions.…”

Section: Radiation Degradation Of Pesticidesmentioning

confidence: 99%

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The use of gamma radiation for removal of pesticides from waste water

1999

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In the present study, a try was made to explain the degradation kinetics due to irradiation of aqueous solutions of some active ingredient pesticides. These pesticides are as follows: one type of triazine herbicide Ametryn and one type of carbamate insecticide (Applaud) and two types of chlorinated organic pesticides, Aldrin and Chlorothalonil. Factors affecting the radiolysis of these pesticides such as the pesticide concentration, irradiation dose, dose rate and pH of the solutions were studied. Ametryn, Applaud, Chlorothalonil and Aldrin insecticides were degraded by Tradiation and in the case of the chlorinated pesticides hydrochloric acid was detected. The pH effect has proved to vary according to the type of the pesticide and little degradation was observed in alkaline medium, while more degradation of the pesticides in the neutral medium was observed depending on the type of pesticide and on its chemical structure. However, the degradation in the acid medium was even higher. A drop in pH was observed and may be attributed to the degradation of the pesticide molecules to lower molecular weight compounds, such as organic acids. A combined treatment of gamma irradiation and conventional methods was applied and the effect of different additives such as nitrogen and oxygen showed that nitrogen did not enhance the degradation, while an enhancement in the degradation process was observed when oxygen was added. Experiments on the adsorption of these pesticides on certain polymeric materials and on Granular Activated Carbon (GAC), showed that GAC has the highest adsorption capacity. It may be concluded that the radiation degradation followed by adsorption of the toxic pesticide pollutants and their removal from wastewater down to concentrations not exceeding the maximum permissible concentration (MPC), according to international standards, proved to be better than the conventional methods of purification.

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Section: Radiation Degradation Of Pesticidesmentioning

confidence: 98%

Section: Radiation Degradation Of Pesticidesmentioning

confidence: 99%

The use of gamma radiation for removal of pesticides from waste water

1999

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“…Beside destruction effects AOPs may improve other treatment steps for example chemical oxidation can aid organic removal within a biological process (van Leeuwen et al 2009). Also it has been reported that the presence of oxygen can improve the efficiency of the irradiation process (Hashimoto et al 1979).…”

Section: Introductionmentioning

confidence: 99%

Ozonation and Electron Beam Irradiation of Dyes Mixture

Emami-Meibodi¹,

Parsaeian²,

Banaei³

2013

Ozone: Science & Engineering

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In this study, the effects of ozone and electron beam radiation on color removal of dyes mixture were studied. According to the obtained results, the COD data denote that a first-irradiation process is a better one and the absorbency data denote that ozonation after irradiation will result in higher values of decolorization. Therefore, it can be said that a process that first applies an electron beam and then uses ozonation is better than the reverse process. Using a new approach for interpretation of the experimental decolorization results, it has been shown that the calculated dye removal percentages based on ozone consumption are near to experimental decolorization results.

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“…Degradation of various organic compounds dissolved in water solutions has been studied by several laboratories, for example the destruction of phenol [4,5,7] or organic dyes [8,9,10]. The problems of water containing humic matters are relate especially to water purification after floods and other disasters.…”

Section: Introductionmentioning

confidence: 99%

Treatment of humic acids solutions by DC diaphragm discharge

Stará

Krčma

2006

Czech J Phys

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This paper presents results obtained from a preliminary investigation of humic acids solutions treated by the DC non-pulsed diaphragm discharge. The first attempts at the removal of humic acids from water by the diaphragm discharge were carried out in a batch discharge reactor. The UV-VIS absorption spectroscopy and the fluorescence spectroscopy were used as fast analytical methods for the determination of changes in humic acids chemical structure. From the obtained fluorescence spectra of the treated solutions, the index of humification was calculated as a ratio of the emission intensities at 470 and 400 nm. The index value points to the ratio of aromatic and aliphatic components in the humic acids mixture. The decrease of the index indicates the increasing aliphatic character of the mixture. Results obtained from the discharge treatment of humic acids solutions are compared to those obtained from experiments with organic dyes dissolved in water and their decomposition by the diaphragm discharge.PACS : 52.80.Wq

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Decoloration and degradation of an anthraquinone dye aqueous solution in flow system using an electron accelerator

Cited by 20 publications

References 9 publications

The use of gamma radiation for removal of pesticides from waste water

The use of gamma radiation for removal of pesticides from waste water

Ozonation and Electron Beam Irradiation of Dyes Mixture

Treatment of humic acids solutions by DC diaphragm discharge

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