Catalytic Advanced Oxidation Processes for Sulfamethoxazole Degradation

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Jéssica Martini (Author) Other; Carla A. Orge (Author) FEUP; Joaquim Luís Faria (Author) FEUP; Manuel Fernando R. Pereira (Author) FEUP; Olívia S. G. P. Soares (Author) FEUP

Journal

Title: Applied Sciences

Vol. 9 No. 13

Pages: 1-13

Publisher: MDPI

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 9 Citations

Associated Projects

AIProcMat@N2020 - Advanced Industrial Processes and Materials for a Sustainable North Region of Portugal2020

Other information

Authenticus ID: P-00Q-J40

DOI: 10.3390/app9132652

Abstract (EN): The degradation of sulfamethoxazole (SMX) by several advanced oxidation processes (AOPs) is carried out in the presence of different catalysts. The catalysts used consisted of carbon nanotubes (CNT), titanium dioxide (TiO2), a composite of carbon nanotubes and titanium dioxide (TiO2/CNT), and iron supported on carbon nanotubes (Fe/CNT). SMX removal was evaluated by catalytic ozonation, photocatalysis, catalytic oxidation with hydrogen peroxide, and combinations of these processes. The evolution of the SMX concentration during reaction time, the mineralization degree, the toxicity of the treated solution, and the formation of organic intermediates and ions were monitored. Ozonation catalyzed by Fe/CNT and CNT and photocatalytic ozonation in the presence of CNT presented the fastest degradation of SMX, whereas photocatalytic ozonation with CNT showed the best results in terms of organic matter removal (92% of total organic carbon (TOC) depletion). Total mineralization of the solution and almost complete reduction of toxicity was only achieved in the photocatalytic ozonation with H2O2 and Fe/CNT catalysts. The compound 3-amino-5-methylisoxazole was one of the first intermediates formed during SMX degradation. p-Benzoquinone was only formed in photocatalysis. Oxalic and oxamic acids were also detected and in most of the catalytic processes they appeared in small amounts. Ion concentrations increased with the reaction time.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 18