Hydroxyl radical based degradation of ciprofloxacin in aqueous solution

• MURTAZA SAYED ^[1] ; LUQMAN ALI SHAH ^[2] ; JAVED ALI KHAN ^[2] ; NOOR SAMAD SHAH ^[2] ; HASAN M KHAN ^[2] ; RAFAQAT ALI KHAN ^[1] ; ABDUR RAHMAN KHAN ^[1] ; ASAD M KHAN ^[1]
  1. [1] COMSATS Institute of Information Technology

     COMSATS Institute of Information Technology

     Pakistán

     
  2. [2] University of Peshawar

     University of Peshawar

     Pakistán

     
• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 61, Nº. 2, 2016, págs. 2949-2953
• Idioma: inglés
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• Resumen

  • 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 N2, N2O or air on CIP degradation were also studied. The influence of various radical scavengers like tert-butanol, iso-propanol, HCO3- , CO3(2-) , NO3- and NO2- as radical scavengers in N2- 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-, CH3COO- and HCOO- were formed as a result of CIP degradation that were analyzed by ion-chromatography.