Skip navigation
Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/2820
Title: Mechanistic insight into ultrasound-induced enhancement of electrochemical oxidation of ofloxacin: Multi-response optimization and cost analysis
Authors: Patidar R.
Srivastava, Vimal Chandra
Published in: Chemosphere
Abstract: In 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
Citation: Chemosphere (2020), 257(): -
URI: https://doi.org/10.1016/j.chemosphere.2020.127121
http://repository.iitr.ac.in/handle/123456789/2820
Issue Date: 2020
Publisher: Elsevier Ltd
Keywords: Cavitation
Energy consumption
Pseudo-first-order kinetics
Radical scavenger
Sonoelectrolysis
Synergistic effect
ISSN: 456535
Author Scopus IDs: 42262496600
35565811700
Author Affiliations: Patidar, R., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Srivastava, V.C., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Funding Details: One 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 .
Corresponding Author: Srivastava, V.C.; Department of Chemical Engineering, Indian Institute of Technology RoorkeeIndia; email: vimalcsr@yahoo.co.in
Appears in Collections:Journal Publications [CH]

Files in This Item:
There are no files associated with this item.
Show full item record


Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.