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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/2641
Title: Growth of hierarchical ZnO nano flower on large functionalized rGO sheet for superior photocatalytic mineralization of antibiotic
Authors: Sharma P.
Kumar N.
Chauhan R.
Singh V.
Srivastava, Vimal Chandra
Bhatnagar R.
Published in: Chemical Engineering Journal
Abstract: In this study, reduced graphene oxide supported mesoporous zinc oxide (rGO@ZnO) was synthesized and applied for the photocatalytic mineralization of ofloxacin, an antibiotic, in the aqueous solution. In-situ rGO@ZnO nano-photocatalysts with different rGO content (0.2%, 0.5%, 1% and 2%) were synthesized using a reflux column method. The nano-photocatalyst was characterized by its structural (crystallinity), morphological, as well as optical properties with the help of powdered X-ray diffraction (P-XRD), field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Raman spectroscopy, Brauner Emmet Teller (BET), thermo-gravimetric/differential thermal analysis (TGA/DTA) and UV–vis diffuse reflectance spectroscopy (DRS). The influences of pH (5–9) and catalyst dose (400–1400 mg/dm3) with irradiation time were studied. At optimum conditions (0.5% rGO@ZnO dose of 1200 mg/dm3 for ofloxacin, pH = 7, and time = 300 min), ultimate degradation efficiency was found to be ?99%, under UV light irradiation. The degradation kinetics fitted well with the first-order kinetic model. The photocatalytic mechanism of the enhanced photo-degradation in the presence of rGO was studied by comparing band structure with the potentials of the main reactive species ([rad]O2 ? and [rad]OH), which result in the mineralization of ofloxacin. The intermediates and pathways during the mineralization were determined using liquid chromatography, which is coupled with mass spectrometry (LC–MS) analysis and a possible pathway was also proposed on the basis of identified intermediates. © 2019
Citation: Chemical Engineering Journal (2020), 392(): -
URI: https://doi.org/10.1016/j.cej.2019.123746
http://repository.iitr.ac.in/handle/123456789/2641
Issue Date: 2020
Publisher: Elsevier B.V.
Keywords: Antibiotic mineralization
Graphene oxide
In-situ rGO@ZnO
Kinetics
Photo-catalysis
Photocatalytic mechanism
ISSN: 13858947
Author Scopus IDs: 57212388326
57203728717
57197047692
57213256302
35565811700
55639096100
Author Affiliations: Sharma, P., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Kumar, N., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Chauhan, R., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Singh, V., 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
Bhatnagar, R., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Corresponding Author: Srivastava, V.C.; Department of Chemical Engineering, Indian Institute of Technology RoorkeeIndia; email: vimalfch@iitr.ac.in
Appears in Collections:Journal Publications [CH]

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