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dc.contributor.authorPatidar R.-
dc.contributor.authorSrivastava, Vimal Chandra-
dc.identifier.citationChemosphere (2020), 257(): --
dc.description.abstractIn this paper, a hybrid advanced oxidation process of sonoelectrochemical, in which ultrasound and electrochemical are applied simultaneously, has been used for the degradation of ofloxacin (bio-recalcitrant pharmaceutical pollutant). Response surface methodology based central composite design was applied to understand the parametric effects of ultrasonic power, current density, initial pH, and electrolyte dose. Enhanced ofloxacin degradation was obtained using sonoelectrochemical (?95%) process in comparison to the electrochemical (?60.6%) and sonolysis alone (?7.2%) after 120 min treatment time. Multi-response optimization was used so as to maximize COD removal (70.12%) and minimize specific energy consumption (11.92 kWh (g COD removed)?1)at the optimized parametric condition of pH = 6.3 (natural pH), ultrasonic power = 54 W, current density = 213 A m?2, and Na2SO4 electrolyte dose = 2.0 g L?1. It was revealed that •OH radicals contribute major to the ofloxacin degradation reaction among the other oxidizing agents. Degradation of the ofloxacin followed pseudo-first-order kinetics with a higher reaction rate, which confirmed the synergistic effect of 34% between ultrasound and electrochemical approaches. The degradation pathway of ofloxacin removal was elucidated at optimum condition by the temporal evolution of the intermediate compounds and final products using gas chromatography coupled with mass spectroscopy (GC-MS), liquid chromatography-mass spectroscopy (LC-MS), high-resolution mass spectroscopy (HR-MS), and Fourier transform infrared spectroscopy (FTIR). Atomic force microscopy (AFM) and field emission scanning electron microscope (FE-SEM) coupled with energy dispersed X-ray (EDX) were used to determine the morphology of electrodes. Operational cost analysis was done based on the reactor employed in the present study. © 2020 Elsevier Ltd-
dc.publisherElsevier Ltd-
dc.subjectEnergy consumption-
dc.subjectPseudo-first-order kinetics-
dc.subjectRadical scavenger-
dc.subjectSynergistic effect-
dc.titleMechanistic insight into ultrasound-induced enhancement of electrochemical oxidation of ofloxacin: Multi-response optimization and cost analysis-
dc.affiliationPatidar, R., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India-
dc.affiliationSrivastava, V.C., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India-
dc.description.fundingOne of the authors (Ritesh Patidar) acknowledges the quality improvement program (QIP) of All India Council for Technical Education (AICTE), Government of India, for providing the scholarship for pursuing this research at the Indian Institute of Technology Roorkee .-
dc.description.correspondingauthorSrivastava, V.C.; Department of Chemical Engineering, Indian Institute of Technology RoorkeeIndia; email:
Appears in Collections:Journal Publications [CH]

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