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Synergistic catalytic degradation of antibiotic sulfamethazine in a heterogeneous sonophotolytic goethite/oxalate Fenton-like system

Paper ID Volume ID Publish Year Pages File Format Full-Text
46337 46437 2013 8 PDF Available
Title
Synergistic catalytic degradation of antibiotic sulfamethazine in a heterogeneous sonophotolytic goethite/oxalate Fenton-like system
Abstract

A novel heterogeneous sonophotolytic goethite/oxalate Fenton-like (SP-FL) system was developed in this study. Compared to the corresponding photochemical Fenton-like (P-FL) system and sonochemical Fenton-like system (S-FL) system, it was found that the SP-FL system could achieve synergistic degradation of antibiotic sulfamethazine (SMZ). A synergy factor of 2.2 based on pseudo-first-order degradation rate constant (kobs) was observed, along with great improvements in organic mineralization and wastewater detoxification. Examining the evolution of dissolved iron species and reactive oxygen species (H2O2 and OH) in the three systems revealed that the SMZ degradation strongly relied on the “in-situ” photochemical generation of H2O2 and fast regeneration of dissolved Fe(II) species. Identification of the organic intermediates and released inorganic ions suggested that the cleavage of SN bond in the SMZ molecule was dominant under OH attacking. The important synergistic role of ultrasound (US) in promoting SMZ degradation was proposed. Herein US could affect the system at multi-folds: (1) accelerating the goethite-chelating dissolution by reducing mass transfer barriers, (2) enhancing the radical reactions in the bulk solution with sonochemical cavitation effect, and (3) possible direct hydrolysis of amine intermediates inside the cavitation bubbles.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A novel goethite catalyzed sonophotolytic Fenton-like (SP-FL) system was developed. ► Synergistic SMZ degradation, mineralization and detoxicity was achieved in the SP-FL system. ► In situ generation of H2O2 and fast regeneration of Fe(II) leads to the synergy achieved. ► The cleavage of SN bond in the SMZ molecule was dominant under OH attacking. ► Ultrasound achieved promotional role in the overall heterogeneous Fenton-like reactions.

Keywords
Sonophotocatalysis; Fenton-like; Sulfamethazine; Iron–oxalate complexes; Goethite
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Synergistic catalytic degradation of antibiotic sulfamethazine in a heterogeneous sonophotolytic goethite/oxalate Fenton-like system
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 136–137, 5 June 2013, Pages 294–301
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