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Heterogeneous oxidation of naproxen in the presence of α-MnO2 nanostructures with different morphologies

Paper ID Volume ID Publish Year Pages File Format Full-Text
46276 46436 2012 8 PDF Available
Title
Heterogeneous oxidation of naproxen in the presence of α-MnO2 nanostructures with different morphologies
Abstract

α-MnO2 nanostructures with different morphologies including nanoparticles, flower-like nanostructures and nanorods have been successfully prepared and used in the heterogeneous oxidation of naproxen in water. It has been found out that the heterogeneous oxidation process is highly pH dependent, with higher efficiency at lower pH values. The oxidation kinetics of naproxen were modeled by Langmuir–Hinshelwood equations. Based on the kinetic constants (k), the oxidation efficiency follows the order of commercial particles < nanorods < flower-like nanostructures < nanoparticles. The mechanism for the oxidation of naproxen has been studied in depth, which shows that the high efficiency can be ascribed to the specific adsorption, electron transfer, and byproducts release. Dissolved anions (Cl−, CO32−, SO42−, PO43−) and cations (Mn2+) could remarkably decrease the removal rate by competitively adsorbing and reacting with MnO2, respectively. In addition, a total of 7 byproducts were identified by LC–MS from which a tentative pathway was proposed.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► α-MnO2 with different morphologies were synthesized via a hydrothermal method. ► The oxidation kinetics of naproxen were modeled by Langmuir–Hinshelwood equations. ► α-MnO2 nanorods can be recycled without decreasing its oxidation. ► A tentative pathway for the degradation of naproxen was proposed.

Keywords
Manganese oxide; Pharmaceutical and personal care products; Naproxen; Heterogeneous oxidation; Nanostructures
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 127, 30 October 2012, Pages 182–189
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us