Hydroxyl Radical Based Degradation of Ciprofloxacin in Aqueous Solution

Abstract

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.

Degradation of phenolic acids by gamma radiation as model compounds of cork wastewaters

“…6a, 7a, 8a, 9a) suggested, in general, highest decomposition (77% to 95%) under saturated N 2 O and at natural pH. The higher degradation under N 2 O atmosphere was previously described [35], being related with the increase of OH radical due to the conversion of …”

Ultrasound-assisted degradation of organophosphorus pesticide methidathion using CuFe2O4@SiO2-GOCOOH as a magnetic separable sonocatalyst

“…This result can be explained by the high concentration of hydroxyl radicals formed, leading to great degradation efficiency. 51,52…”

“…This result can be explained by the high concentration of hydroxyl radicals formed, leading to great degradation efficiency. 51,52 The inuence of catalyst concentration on the degradation rate of methidathion was investigated by using different concentrations of CuFe 2 O 4 @SiO 2 -GO COOH sonocatalyst. The results of this study are presented in Fig.…”

Competition Kinetics: An Experimental Approach

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