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Substituent structure variances alter degradation pathways of sulfonamides in UV/PAA system: Insights from intermediates, ROS, and DFT calculations.
J Hazard Mater
December 2024
School of Environment, Beijing Normal University, No.19, Xinjiekouwai Street, Haidian District, Beijing 100875, China. Electronic address:
Sulfonamides (SAs) are one of the major emerging contaminants of concern, but comparative studies on the degradation of different types of SAs are still limited. This work comprehensively compared the degradation of sulfadiazine (SDZ), sulfamethoxazole (SMX) and sulfathiazole (STZ) under UV light in peracetic acid (PAA) from both experimental and theoretical aspects, as they represent two structural classes based on substituent differences. The two SAs with five-membered heterocyclic substituents (SMX, STZ) generally decomposed at faster rates, with SMX degrading up to 10 times faster than SDZ (pH = 3; PAA dosage = 80 mg/L).
View Article and Find Full Text PDFDegradation of sulfamethoxazole in a falling film dielectric barrier discharge system: Performance, mechanism and toxicity evaluation.
Sci Total Environ
December 2024
College of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China; Shanghai institute of pollution control and ecological security, Shanghai 200092, China. Electronic address:
The ubiquitous presence of sulfonamides (SAs) in wastewater poses serious risks to human health and ecosystem safety. This study evaluated the performance of a falling film dielectric barrier discharge (DBD) system on the removal of five SAs, namely sulfamethoxazole (SMX), sulfisoxazole (SIZ), sulfathiazole (STZ), sulfadiazine (SDZ) and sulfamerazine (SMR). Removal efficiencies >99 % were observed for all target SAs within 30 min of treatment, with pseudo-first order rate constants varying between 0.
View Article and Find Full Text PDFMolecular insights into biological transformation mechanism of sulfathiazole by Chlorella sorokiniana: Deciphering the uptake, translocation, and biotransformation.
J Hazard Mater
December 2024
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, PR China. Electronic address:
As a sustainable approach to wastewater treatment, microalgae have been extensively used to degrade antibiotics. However, the underlying mechanisms involved in the degradation process remain unclear. Therefore, this study investigated the biotransformation mechanism of sulfathiazole (STZ) by Chlorella sorokiniana (C.
View Article and Find Full Text PDFInsight into efficient degradation of pentacyclic and hexacyclic sulfonamide antibiotics by synthetic trivalent copper: Performance and mechanism.
J Environ Manage
November 2024
National and Local Joint Engineering Research Center for Ecological Treatment Technology of Urban Water Pollution, College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, China. Electronic address:
Article Synopsis
- High valent metal species like Cu(III), Mn(III), and Fe(IV) are important in breaking down pollutants, but research on Cu(III) is less developed.
- Researchers synthesized copper(III) periodate to test its effectiveness on six sulfonamide antibiotics, finding that Cu(III) can nearly fully degrade them in just 10 minutes if used in a 3:1 molar ratio.
- SAs with 6-ring structures were degraded more easily, especially when they had electron-rich groups; however, factors like pH and the presence of certain compounds influenced the degradation process.
Atomistic Analysis of Sulphonamides as a Microbial Influenced Corrosion (MIC) Inhibitor.
ACS Omega
September 2024
Centre for Risk, Integrity, and Safety Engineering (C-RISE), Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL A1B 3X5, Canada.
Four sulfonamide-type microbial inhibitors were studied using density functional theory (DFT) to assess their effectiveness in controlling microbial corrosion. The experimental techniques (FTIR, SEM, EIS, EFM, and AFM) are beneficial for measuring properties such as chemical composition, bond formation, electrochemical behavior, and surface topography; however, DFT can be useful as a new method for understanding microbial corrosion. Sulfacetamide (SFC), sulfamerazine (SFM), sulfapyridine (SFP), and sulfathiazole (SFT) uniformly adsorb onto the iron surface and block the active site, reducing the corrosion rate.
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