The degradation of an azo dye in aqueous solutions by high-intensity electron-beam irradiation

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

doi:10.1016/0020-708x(78)90031-5

Cited by 27 publications

(9 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The general trend for the degradation process is as follows: the percent degradation is the highest for the lowest dose rate (0.3 Gy sl), followed by dose rate 0.6 Gy s 1 and the dose rate 1.2 Gy s 1 showed a lower degradation percent. This behavior is expected and is in good agreement with reported results [10][11][12][13]. The pH influence has proved to vary according to the type of the pesticide.…”

Section: Radiation Degradation Of Pesticidessupporting

confidence: 91%

“…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%

See 1 more Smart Citation

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

1999

View full text Add to dashboard Cite

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.

show abstract

Section: Radiation Degradation Of Pesticidessupporting

confidence: 91%

Section: Radiation Degradation Of Pesticidesmentioning

confidence: 98%

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

1999

View full text Add to dashboard Cite

show abstract

“…3). The (-N N-) groups are very sensitive to radiation and the ruptured immediately when exposed to low doses of gamma irradiation [87,88]. However, it is expected that dye degradation rates for different dyes will not be too different (within one order of magnitude).…”

Section: Correlation Of Dye Degradation With Its Typementioning

confidence: 99%

Radiation induced degradation of dyes—An overview

Rauf

Ashraf

2009

Journal of Hazardous Materials

245

View full text Add to dashboard Cite

“…The ionization radiation degradation has been used to degrade some other organic compounds, which are not easy to be decomposed. 16,17 When the ionizing radiation passes through the water, the radiolysis of water takes place forming •H and •OH radicals etc. These radicals can react with the solutes in bulk aqueous solution 18 and degrade the contaminants.…”

Section: Introductionmentioning

confidence: 99%

γ‐Irradiation Degradation of Methamidophos

Zhao

Bao²,

Xia

2009

Chin. J. Chem.

View full text Add to dashboard Cite

The irradiation degradation of methamidophos in aqueous solutions by 60 Co-γ rays was investigated. The effects of absorbed doses, saturated gas, and the additive of H 2 O 2 on the degradation were also studied. The results showed that the oxidative radical, such as •OH, played an important role in the irradiation degradation of methamidophos; while the reductive radicals, aq e − and •H, had no contribution to the degradation. The degradation rate of methamidophos increased with the increase of the irradiation dosage. At certain irradiation dosage, methamidophos could be degraded completely. The degradation rate of methamidophos in the solution saturated with oxygen was higher than those saturated with other gases, which reached 100% when the absorbed dose was 8 kGy. H 2 O 2 degraded methamidophos slowly when it was used alone, but could accelerate the degradation obviously when it was used with irradiation together.

show abstract

The degradation of an azo dye in aqueous solutions by high-intensity electron-beam irradiation

Cited by 27 publications

References 6 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

Radiation induced degradation of dyes—An overview

γ‐Irradiation Degradation of Methamidophos

Contact Info

Product

Resources

About