Photocatalytic degradation of 5-fluorouracil in an aqueous environment via Bi-B co-doped TiO2 under artificial sunlight
Agnieszka Fiszka-Borzyszkowska , Aleksandra Pieczyńska , Aleksandra Ofiarska , W. Lisowski , K. Nikiforow , Ewa Maria Siedlecka
AbstractThe morphology of a series of Bi–B co-doped titanium oxide photocatalysts and its optical properties were characterized. The results suggested that boron and bismuth as co-dopants were incorporated into the framework of titanium matrix. For the B and Bi-doped TiO2 samples, surface area decreased while the Bi content increased. Based on the photoluminescence spectra, a decrease in recombination rate of photogenerated carriers was observed with the increasing amount from 0.5 to 3 mol% of Bi in Bi–B–TiO2 composites. The most active photocatalyst in 5-fuorouracil (5-FU) photodegradation was 3 mol% of Bi in Bi–B–TiO2. The efects of operating parameters: pH, drug concentration and natural organic matter presence (NOM) in the efuent from wastewater treatment plant, were investigated. The highest efciency of 5-FU photodegradation was observed at neutral pH for the drug concentration equal to 1 mg/L and photocatalyst of 0.05 g/L. While in distilled water solutions, the catalyst showed good removal efciency of the drug, the process was totally inhibited by NOM in the complex matrix which was the treated sewage, what could be connected with the internal flter and scavenging efect. Based on the identifcation of organic and inorganic by-products of the photooxidation, the pathway of 5-FU degradation was proposed. The mineralization was poor (5–7%) in the case of both 3Bi–B–TiO2 and pure TiO2 for the drug of 50 mg/L, but photocatalytic oxidation of drug led to non-toxic products toward Lemma minor.
|Journal series||International Journal of Environmental Science and Technology, ISSN 1735-1472, e-ISSN 1735-2630, (N/A 70 pkt)|
|Publication size in sheets||0.65|
|Keywords in English||Photocatalysis, kinetics, scavengers, fluoro-barbituric acid, operating conditions|
|ASJC Classification||; ;|
|Score||= 70.0, 10-02-2020, ArticleFromJournal|
|Publication indicators||: 2018 = 0.918; : 2018 = 2.031 (2) - 2018=2.396 (5)|
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