Radiation induced decomposition of methyl tert-butyl ether in water in presence of chloroform: Kinetic modelling

Basfar, Ahmed A.; Khan, Hasan M.; Alshahrani, Ahmed A.; Cooper, William J.

doi:10.1016/j.watres.2005.02.019

Cited by 87 publications

(40 citation statements)

References 36 publications

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“…The removal efficiency (G-value) was decreased from 0.17 to 0.14 molecules / 100 eV when the absorbed dose was increased from 100 to 400 Gy. Which is in accordance with previous reported results for destruction of methyl tert-butyl ether in water in presence of chloroform [21].…”

Section: Reaction Of CV Withsupporting

confidence: 94%

“…A continuous decreasing trend in G-values was observed from 0.53 -0.36 molecules/100 eV at absorbed doses from 100 -400 Gy. This decreasing trend in G-values might be due to the fact that as the absorbed dose increases the concentration of target pollutant (CV) decreases and the concentration of byproducts increases which then competes with the CV molecule for reactive radical [21].…”

Section: Probability Calculations For the Determination Of Concentratmentioning

confidence: 99%

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Removal of Crystal Violet Dye From Aqueous Solution by Gamma Irradiation

Rehman

Sayed

Khan

et al. 2017

J. Chil. Chem. Soc.

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In this study the radiation-induced degradation of crystal violet (CV) dye under various experimental conditions has been investigated. D 0.5 , D 0.9 and D 0.99 values suggests that lower doses are required for 50%, 90% and 99% removal of CV dye when the sample solution contains excessive amount of• OH radicals. The removal efficiency of CV dye in terms of G-values was also calculated under each reaction conditions. The results showed that• OH radicals are playing effective role in the degradation of CV dye as compared to e aq -and • H radicals. The gamma irradiation process effectively degraded CV dye at all pH values. The organic byproducts were examined and accordingly degradation pathway was proposed.

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Section: Reaction Of CV Withsupporting

confidence: 94%

Section: Probability Calculations For the Determination Of Concentratmentioning

confidence: 99%

Removal of Crystal Violet Dye From Aqueous Solution by Gamma Irradiation

Rehman

Sayed

Khan

et al. 2017

J. Chil. Chem. Soc.

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“…3, the G-values decreased with increasing radiation dose. However, for a given radiation dose, the G-values increased with the higher initial CIP concentration, which is similar to previously reported results with chloroform and MTBE [17]. This can be explained by the fact that at higher CIP concentrations, the reactive radicals have a greater chance of reacting with CIP molecules, leading to higher removal efficiency, represented by higher G-values.…”

Section: Figsupporting

confidence: 89%

“…(2), the G-values of CIP (4.6 mg/L) at different radiation doses were calculated as shown in Table 2. The G-values decreased with increasing radiation dose, a trend that has been reported in several other studies [15][16][17]. Firstly, this trend can be explained by competition for solute molecules (CIP) between the reactive species produced during radiolysis of water.…”

Section: Figsupporting

confidence: 68%

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Hydroxyl Radical Based Degradation of Ciprofloxacin in Aqueous Solution

Sayed

Shah

Khan

et al. 2016

J. Chil. Chem. Soc.

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This study reports the degradation of ciprofloxacin (CIP) by means of ionizing radiations. Kinetic studies with aqueous concentrations of 4.6, 10, 15, 17.9 mg/L reveals that degradation of CIP follows pseudo-first order kinetics and the decay constant increased with decrease in initial concentration of CIP. The removal efficiency, represented by G-value, decreased with increasing absorbed dose and increased with higher [CIP] 0 concentration at a given absorbed dose. The effects of bubbling CIP solution with N 2 , N 2 O or air on CIP degradation were also studied. The influence of various radical scavengers like tert-butanol, isopropanol, HCO 3 -, CO 3 2-, NO 3 -and NO 2 -as radical scavengers in N 2 -saturated solutions of CIP indicated that • OH were more closely associated with the radiolytic decomposition of CIP than other radicals, such as e -aq or • H. The pH value of aqueous media played a crucial role in the degradation of CIP. It was observed that degradation efficiency was higher under acidic condition compared to degradation in natural or alkaline media. F -, CH 3 COO -and HCOO -were formed as a result of CIP degradation that were analyzed by ion-chromatography.

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Degradation of tetracyclines in different water matrices by advanced oxidation/reduction processes based on gamma radiation

López-Peñalver

Gómez-Pacheco

Sánchez‐Polo

et al. 2012

J of Chemical Tech & Biotech

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BACKGROUND: This study analyzes the efficacy of a gamma radiation advanced oxidation/reduction process (AORP) to treat waters contaminated with the antibiotics tetracycline (TC), chlortetracycline (CTC), and oxytetracycline (OTC). RESULTS: Study results indicate that:(1) radiolysis of the three TCs fits a pseudo-first-order kinetic model in which the radiation-chemical yield decreases with higher absorbed dose; (2) the value of the dose constant depended on the dose rate, which ranged from 3.83 to 1.66 Gy min -1 , and depended to a small extent on the medium pH between pH values of 2.0 and 10.0, since aqueous electrons and hydroxyl radicals both act in TC degradation; (3) the effectiveness of the process was slightly increased at low concentrations of H 2 O 2 ; (4) the presence of Cl − , CO 2 3 , NO − 3 , NO − 2 and humic acid influenced TCs degradation, which was higher at low concentrations of Cl − , CO 2− 3 and HA and markedly decreased at low concentrations of of NO − 3 and NO − 2 ; (5) the dose constant is lower in natural waters; (6) TOC values for ultrapure water, surface water, groundwater and wastewater showed that it is not possible to obtain complete TC mineralization at the absorbed doses; (7) the toxicity of byproducts formed during the radiolytic process was lower. CONCLUSIONS: Gamma radiation, an oxidation/reduction procedure, is an effective treatment for removing TC, CTC and OTC from aqueous solutions. TC degradation takes place by both oxidation and reduction pathways, with a predominance of the latter, as demonstrated by the markedly reduced dose constant in the presence of aqueous electron scavengers.

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Radiation induced decomposition of methyl tert-butyl ether in water in presence of chloroform: Kinetic modelling

Cited by 87 publications

References 36 publications

Removal of Crystal Violet Dye From Aqueous Solution by Gamma Irradiation

Removal of Crystal Violet Dye From Aqueous Solution by Gamma Irradiation

Hydroxyl Radical Based Degradation of Ciprofloxacin in Aqueous Solution

Degradation of tetracyclines in different water matrices by advanced oxidation/reduction processes based on gamma radiation

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