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DOI: https://doi.org/10.4491/eer.2018.058
Efficiency comparison of advanced oxidation processes for ciprofloxacin removal from aqueous solutions: Sonochemical, sono-nano-chemical and sono-nano-chemical/persulfate processes
Chinenye Adaobi Igwegbe1, Shahin Ahmadi2, Somayeh Rahdar2, Alireza Ramazani3, and Abdol Raufeh Mollazehi2
1Department of Chemical Engineering, NnamdiAzikiwe University, Awka, Nigeria
2Department of Environmental Health, Zabol University of Medical Sciences, Zabol, Iran
3Department of Environmental Health, Zahdan University of Medical Sciences, Zahdan, Iran
Corresponding Author: Shahin Ahmadi ,Tel: +98-9184957156, Email: sh.ahmadi398@gmail.com
Received: February 1, 2018;  Accepted: March 2, 2019.
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ABSTRACT
The aim of this study is to investigate the degradation of ciprofloxacin (CIP) from its aqueous solutions via different advanced oxidation processes (AOPs). The effects of persulfate (PS) concentration, pH, zinc oxide nanoparticles (ZnO-NPs) dose, initial CIP concentration, and reaction time on the degradation of CIP were studied. It was found that the sonochemical (US) degradation is a less efficient process (with removal efficiency of 36%) compared to the sono-nano-chemical (US/ZnO) process which resulted in removal efficiency of 70%. Maximum removal of 99% was obtained using the sono-nano-chemical/persulfate (US/ZnO/PS) process at a frequency of 60 kHz, time of 10 min, pH of 7, initial CIP concentration of 25 mg/L, and PS concentration of 476.06 mg/L. The addition of persulfate and ZnO-NPs to the process enhanced the rate of US degradation of CIP. In addition, the kinetic parameters for the US/ZnO/PS process were obtained by fitting the kinetic data into the pseudo-first-order and pseudo-second-order kinetic models. The kinetic data was found to fit into the pseudo-first-order kinetic model than the pseudo-second-order model. The results showed that the AOP using US/ZnO/PS is a promising technique for the treatment of ciprofloxacin containing solutions.
Keywords: Advanced oxidation process | Aqueous solution | Ciprofloxacin | Nanoparticles | Persulfate
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