A New Mechanism of the Selective Photodegradation of Antibiotics in the Catalytic System Containing TiO<sub>2</sub> and the Inorganic Cations
The mechanism of sulfisoxazole (SFF) selective removal by photocatalysis in the presence of titanium (IV) oxide (TiO<sub>2</sub>) and iron (III) chloride (FeCl<sub>3</sub>) was explained and the kinetics and degradation pathways of SFF and other antibiotics were compared. The...
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MDPI AG
2021-08-01
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| Series: | International Journal of Molecular Sciences |
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| Online Access: | https://www.mdpi.com/1422-0067/22/16/8696 |
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| author | Wojciech Baran Mateusz Cholewiński Andrzej Sobczak Ewa Adamek |
| author_facet | Wojciech Baran Mateusz Cholewiński Andrzej Sobczak Ewa Adamek |
| author_sort | Wojciech Baran |
| collection | DOAJ |
| description | The mechanism of sulfisoxazole (SFF) selective removal by photocatalysis in the presence of titanium (IV) oxide (TiO<sub>2</sub>) and iron (III) chloride (FeCl<sub>3</sub>) was explained and the kinetics and degradation pathways of SFF and other antibiotics were compared. The effects of selected inorganic ions, oxygen conditions, pH, sorption processes and formation of coordination compounds on the photocatalytic process in the presence of TiO<sub>2</sub> were also determined. The Fe<sup>3+</sup> compounds added to the irradiated sulfonamide (SN) solution underwent surface sorption on TiO<sub>2</sub> particles and act as acceptors of excited electrons. Most likely, the SFF degradation is also intensified by organic radicals or cation organic radicals. These radicals can be initially generated by reaction with electron holes, hydroxyl radicals and as a result of electron transfer mediated by iron ions and then participate in propagation processes. The high sensitivity of SFF to decomposition caused by organic radicals is associated with the steric effect and the high bond polarity of the amide substituent. |
| first_indexed | 2024-03-10T08:45:10Z |
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| institution | Directory Open Access Journal |
| issn | 1661-6596 1422-0067 |
| language | English |
| last_indexed | 2024-03-10T08:45:10Z |
| publishDate | 2021-08-01 |
| publisher | MDPI AG |
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| series | International Journal of Molecular Sciences |
| spelling | doaj.art-d01975e9766c490ca6d310aea1b7a6262023-11-22T07:59:12ZengMDPI AGInternational Journal of Molecular Sciences1661-65961422-00672021-08-012216869610.3390/ijms22168696A New Mechanism of the Selective Photodegradation of Antibiotics in the Catalytic System Containing TiO<sub>2</sub> and the Inorganic CationsWojciech Baran0Mateusz Cholewiński1Andrzej Sobczak2Ewa Adamek3Department of General and Analytical Chemistry, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia in Katowice, Jagiellońska 4, 41-200 Sosnowiec, PolandDepartment of General and Analytical Chemistry, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia in Katowice, Jagiellońska 4, 41-200 Sosnowiec, PolandDepartment of General and Analytical Chemistry, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia in Katowice, Jagiellońska 4, 41-200 Sosnowiec, PolandDepartment of General and Analytical Chemistry, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia in Katowice, Jagiellońska 4, 41-200 Sosnowiec, PolandThe mechanism of sulfisoxazole (SFF) selective removal by photocatalysis in the presence of titanium (IV) oxide (TiO<sub>2</sub>) and iron (III) chloride (FeCl<sub>3</sub>) was explained and the kinetics and degradation pathways of SFF and other antibiotics were compared. The effects of selected inorganic ions, oxygen conditions, pH, sorption processes and formation of coordination compounds on the photocatalytic process in the presence of TiO<sub>2</sub> were also determined. The Fe<sup>3+</sup> compounds added to the irradiated sulfonamide (SN) solution underwent surface sorption on TiO<sub>2</sub> particles and act as acceptors of excited electrons. Most likely, the SFF degradation is also intensified by organic radicals or cation organic radicals. These radicals can be initially generated by reaction with electron holes, hydroxyl radicals and as a result of electron transfer mediated by iron ions and then participate in propagation processes. The high sensitivity of SFF to decomposition caused by organic radicals is associated with the steric effect and the high bond polarity of the amide substituent.https://www.mdpi.com/1422-0067/22/16/8696molecular mechanismphotocatalysissulfonamidesfree radicalsTiO<sub>2</sub> |
| spellingShingle | Wojciech Baran Mateusz Cholewiński Andrzej Sobczak Ewa Adamek A New Mechanism of the Selective Photodegradation of Antibiotics in the Catalytic System Containing TiO<sub>2</sub> and the Inorganic Cations International Journal of Molecular Sciences molecular mechanism photocatalysis sulfonamides free radicals TiO<sub>2</sub> |
| title | A New Mechanism of the Selective Photodegradation of Antibiotics in the Catalytic System Containing TiO<sub>2</sub> and the Inorganic Cations |
| title_full | A New Mechanism of the Selective Photodegradation of Antibiotics in the Catalytic System Containing TiO<sub>2</sub> and the Inorganic Cations |
| title_fullStr | A New Mechanism of the Selective Photodegradation of Antibiotics in the Catalytic System Containing TiO<sub>2</sub> and the Inorganic Cations |
| title_full_unstemmed | A New Mechanism of the Selective Photodegradation of Antibiotics in the Catalytic System Containing TiO<sub>2</sub> and the Inorganic Cations |
| title_short | A New Mechanism of the Selective Photodegradation of Antibiotics in the Catalytic System Containing TiO<sub>2</sub> and the Inorganic Cations |
| title_sort | new mechanism of the selective photodegradation of antibiotics in the catalytic system containing tio sub 2 sub and the inorganic cations |
| topic | molecular mechanism photocatalysis sulfonamides free radicals TiO<sub>2</sub> |
| url | https://www.mdpi.com/1422-0067/22/16/8696 |
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