| Autor: |
Popović, Marin, Sharifi, Tayebeh, Kovačić, Marin, Peternel, Igor, Kušić, Hrvoje, Lončarić Božić, Ana |
| Přispěvatelé: |
Gazivoda Kraljević, Tatjana |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Popis: |
Different crystal forms of a photoactive material have different photocatalytic activities, usually represented by differences in band gap energies and affinity to recombination of generated charge carriers. In photocatalytic experiments, monoclinic bismuth vanadate is the most used form of bismuth vanadate. Monoclinic bismuth vanadate is a n-type visible light photocatalyst which means that the majority of charge carriers in this crystal form are electrons. In fact, low mobility of photogenerated holes is one of the main disadvantages of monoclinic BiVO4. Nevertheless, under visible light irradiation this form of BiVO4 can degrade most of organic dyes in a few hours. For degradation of complex molecules modifications of monoclinic BiVO4 are required. In past studies, bismuth vanadate was first enhanced via morphological change resulting in spherical isotype homojunction BiVO4. Second modification of photocatalytic activity was postdeposition of silver and iron nanoparticles onto its surface. Newly synthesized photocatalysts were immobilized on glass plates. With the use of response surface methodology (RSM), the best conditions (mass of nanoparticles precursor, pH and concentration of hydrogen peroxide) for degradation of 50 μM ciprofloxacin (CIP) under simulated sunlight were examined. In this study, reactive oxygen species (ROS) scavenging under the best conditions for each photo deposited material was performed. The used scavengers were: formic acid for holes, 1, 4- benzoquinone as superoxide scavenger and dimethyl sulfoxide (DMSO) as hydroxyl radical scavenger. The obtained results of photocatalytic degradation of CIP under sunlight with hydrogen peroxide show differences in mechanism of activation of hydrogen peroxide with different photodeposited nanoparticles. Those results will be combined with mass spectrometry results and toxicological studies to get the detailed pathway of CIP photodegradation under defined conditions. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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