Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/106848
Title: Solar Photocatalytic Degradation of Sulfamethoxazole by TiO2 Modified with Noble Metals
Authors: Borowska, Ewa
Gomes, João 
Martins, Rui C. 
Quinta-Ferreira, R. M. 
Horn, Harald
Gmurek, Marta 
Keywords: photocatalytic oxidation; sulfamethoxazole; titanium dioxide modified with noble metals; transformation products; natural sunlight
Issue Date: 2019
Publisher: MDPI
Project: This study was funded by the German Technical and Scientific Association for Gas and Water (DVGW). Marta Gmurek gratefully acknowledges German Academic Exchange Service DAAD (Deutscher Akademischer Austauschdienst) for financing the short-term research stay at KIT EBI Water Chemistry and Water Technology. Marta Gmurek acknowledges also financial support from the Mobility Plus Program (Project No. 1650/MOB/V/2017/0) funded by the Polish Ministry of Science and Higher Education (from 2018). João F. Gomes and Rui C. Martins gratefully acknowledge the Fundaçãopara a Ciênciae Tecnologia for the financial support under IFCT2014 Program (No. IF/00215/2014) with financing from the European Social Fund and the Human Potential Operational Programme. 
Serial title, monograph or event: Catalysts
Volume: 9
Issue: 6
Abstract: Application of solar photocatalysis for water treatment is intensively studied. In this work, we investigated TiO2 modified with platinum (Pt/TiO2) and palladium (Pd/TiO2) using sulfamethoxazole (SMX) as the model contaminant. We considered the following parameters: (i) level of TiO2 modification with Pt/Pd, (ii) initial concentration of photocatalysts, (iii) geographic location where processes were conducted, and (iv) natural water matrix. The catalysts characterized by SEM, EDX, DRS, and XRD techniques showed successful deposition of Pd and Pt atoms on TiO2 surface that enabled light absorption in the visible (Vis) range, and therefore caused e cient SMX removal in all tested conditions. A comparison of the rate constants of SMX degradation in various conditions revealed that modification with Pd gave better results than modification with Pt, which was explained by the better optical properties of Pd/TiO2. The removal of SMX was higher with Pd/TiO2 than with Pt/TiO2, independent of the modification level. In the experiments with the same modification level, similar rate constants were achieved when four times the lower concentration of Pd/TiO2 was used as compared with Pt/TiO2. Formation of four SMX transformation products was confirmed, in which both amine groups are involved in photocatalytic oxidation. No toxic e ect of post-reaction solutions towards Lepidium sativum was observed.
URI: https://hdl.handle.net/10316/106848
ISSN: 2073-4344
DOI: 10.3390/catal9060500
Rights: openAccess
Appears in Collections:I&D CERES - Artigos em Revistas Internacionais

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