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Title: Mechanistic and kinetic insights of synergistic mineralization of ofloxacin using a sono-photo hybrid process
Authors: Patidar R.
Srivastava, Vimal Chandra
Published in: Chemical Engineering Journal
Abstract: The present study reports an ultrasound-photocatalysis based hybrid method for effective degradation/mineralization of a bio-recalcitrant pharmaceutical pollutant, namely ofloxacin (OFLX). To understand the role of different techniques, individual and various combined ultrasound and ultraviolet along with H2O2, TiO2, and ZnO photo-catalyst were investigated in different protocols to understand synergistic effects and mechanistic insight of the mineralization process. Photocatalysts were characterized by FTIR, FE-SEM, TEM, EDX, BET, and EIS analysis. A significant synergistic index of 3.1 for mineralization of OFLX was obtained during the combined US/UV/H2O2/ZnO method due to higher oxidizing ([rad]OH) radical formation as compared to other binary and ternary hybrid methods. OFLX degradation and total organic carbon removal were 94.2% and 45.1%, respectively, using US/UV/H2O2/ZnO method at operating condition of H2O2/OFLX stoichiometric molar ratio = 5, ZnO dosage = 0.40 g L−1, 40 kHz ultrasonic frequency, 125 W UV power, reaction time of 120 min and pH 6.3 (natural pH). Kinetics of the degradation was well-represented by the power-law kinetic model with an order of reaction being 2.2 and 1.9 for US + UV + H2O2 + TiO2 and US + UV + H2O2 + ZnO, respectively. Besides, specific energy consumption (SEC), electrical energy per order (EEO), and the operating cost (OC) of each method employed was determined. A detailed OFLX degradation pathway has been suggested, and possible reasons for synergy are identified and discussed. © 2020 Elsevier B.V.
Citation: Chemical Engineering Journal, 403
Issue Date: 2021
Publisher: Elsevier B.V.
Keywords: Cyclic voltammetry
Hydroxyl radicals
Synergistic effect
ISSN: 13858947
Author Scopus IDs: 42262496600
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) supported by 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. All India Council for Technical Education, अभातशिप
Corresponding Author: Srivastava, V.C.; Department of Chemical Engineering, India; email:
Appears in Collections:Journal Publications [CH]

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