Role of aqueous electron and hydroxyl radical in the removal of endosulfan from aqueous solution using gamma irradiation

Shah, Noor S.; Khan, Javed Ali; Nawaz, Shah; Khan, Hasan M.

doi:10.1016/j.jhazmat.2014.05.073

Cited by 89 publications

(32 citation statements)

References 42 publications

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“…Table (2). The G values of norfloxacin under all cases decreased with increase in the absorbed dose, probably due to the increase in the concentration of byproducts which led to the competition with target contaminant for reactive species (Khan et al 2014b;Shah et al 2014Shah et al , 2015. The higher G values for the degradation of norfloxacin in N 2 O-saturated solution strengthens our finding that • OH played important role in norfloxacin degradation.…”

Section: Role Of Reactive Species In the Degradation Of Norfloxacinsupporting

confidence: 76%

Degradation of quinolone antibiotic, norfloxacin, in aqueous solution using gamma-ray irradiation

Sayed

Khan

Shah

et al. 2016

Environ Sci Pollut Res

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109

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This study reports the efficiency of gamma-ray irradiation to degrade quinolone antibiotic, norfloxacin, in aqueous solution. Laboratory batch experiments were conducted to determine the "pseudo-first" order degradation kinetics of norfloxacin in the concentration ranges of 3.4-16.1 mg L(-1) by gamma-ray irradiation. The dose constant was found to be dependent on the initial concentration of norfloxacin and gamma-ray irradiation dose rate (D r). The saturation of norfloxacin sample solutions with N2, air or N2O, and the presence of tert-butanol and 2-propanol showed that (•)OH played more crucial role in the degradation of norfloxacin. The second order rate constants of (•)OH, eaq (-), and (•)H with norfloxacin were calculated to be 8.81 × 10(9), 9.54 × 10(8), and 1.10 × 10(9) M(-1) s(-1), respectively. The effects of various additives including CO3 (2-), HCO3 (-), NO3 (-), NO2 (-), and thiourea and the pH of the medium on the degradation of norfloxacin were also investigated. Norfloxacin degradation was lower in surface water and wastewater than in ultrapure water. Several degradation byproducts of norfloxacin were identified from which the possible degradation pathway was proposed.

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Section: Role Of Reactive Species In the Degradation Of Norfloxacinsupporting

confidence: 76%

Degradation of quinolone antibiotic, norfloxacin, in aqueous solution using gamma-ray irradiation

Sayed

Khan

Shah

et al. 2016

Environ Sci Pollut Res

Self Cite

109

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“…The dye sample solution was bubbled with N 2 O gas and spiked with 10 -2 M of tert-BUOH. Under this condition e aq -and • OH radicals are scavenged by N 2 O gas and tert-BUOH according to equations (9) and (10), respectively [20]. SO, only…”

Section: Reaction Of CV Withmentioning

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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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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“…The presence of these inorganic anions and HA have been reported to efficiently scavenge the reactive radicals during gamma irradiation of the target contaminant as shown by Eqs. (15)-(18) (Buxton et al, 1988;Basfar et al, 2009;Shah et al, 2014). The effects of these inorganic anions and HA were therefore assessed in the present study for potential practical applications of gamma irradiation treatment of endosulfan sulfate.…”

Section: Effect Of Inorganic Anions and Humic Acidmentioning

confidence: 99%

Kinetic and mechanism investigation on the gamma irradiation induced degradation of endosulfan sulfate

et al. 2015

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Role of aqueous electron and hydroxyl radical in the removal of endosulfan from aqueous solution using gamma irradiation

Cited by 89 publications

References 42 publications

Degradation of quinolone antibiotic, norfloxacin, in aqueous solution using gamma-ray irradiation

Degradation of quinolone antibiotic, norfloxacin, in aqueous solution using gamma-ray irradiation

Removal of Crystal Violet Dye From Aqueous Solution by Gamma Irradiation

Kinetic and mechanism investigation on the gamma irradiation induced degradation of endosulfan sulfate

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