Removal of 5-fluorouracil by solar-driven photoelectrocatalytic oxidation using Ti/TiO2(NT) photoelectrodes

Paweł Mazierski , Agnieszka Fiszka-Borzyszkowska , Patrycja Wilczewska , Anna Białk-Bielińska , Adriana Zaleska-Medynska , Ewa Maria Siedlecka , Aleksandra Pieczyńska

Abstract

The efficient and safe degradation of drugs present in wastewater requires the design of a new material possessing high activity for that process. In addition to other methods, photoelectrocatalysis (PEC) merges the strengths of both photocatalytic and electrochemical methods, and the efficiency could be enhanced by the type of photoelectrode material. To address this challenge, three Ti/TiO2 nanotube-based photoelectrodes, differing in their tube morphology, were prepared by anodic oxidation and employed for the degradation of the 5-fluorouracil (5-FU) drug by the PEC process. The highest efficiency for 5-fluorouracil (5-FU) degradation by PEC was observed for the photoelectrode with a 1.7 μm length, 65 nm diameter and 8 nm wall thickness of TiO2 nanotubes, which were prepared by Ti foil anodization at 30 V. The effects of applied potential, irradiation intensity, initial pH and 5-FU concentration on PEC were investigated. Furthermore, our findings showed that the mechanism of photoelectrocatalysis in the presence of TiO2 nanotubes is based on ∙OH and h+ activity. To determine the 5-FU degradation pathway, the organic byproducts were identified by LC-MS analysis. Furthermore, the ecotoxicity evaluated during PEC dropped with decreasing 5-FU concentration.
Author Paweł Mazierski (FCh / DET / LPh)
Paweł Mazierski ,,
- Laboratory of Photocatalysis
, Agnieszka Fiszka-Borzyszkowska (FCh / DET / LAOP)
Agnieszka Fiszka-Borzyszkowska,,
- Laboratory of Advanced Oxidation Processes
, Patrycja Wilczewska (FCh / DET / LAOP)
Patrycja Wilczewska,,
- Laboratory of Advanced Oxidation Processes
, Anna Białk-Bielińska (FCh / DEA / LChER)
Anna Białk-Bielińska,,
- Laboratory of Chemical Environmental Risks
, Adriana Zaleska-Medynska (FCh / DET / LPh)
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
, Ewa Maria Siedlecka (FCh / DET / LAOP)
Ewa Maria Siedlecka,,
- Laboratory of Advanced Oxidation Processes
, Aleksandra Pieczyńska (FCh / DET / LAOP)
Aleksandra Pieczyńska,,
- Laboratory of Advanced Oxidation Processes
Journal seriesWater Research, ISSN 0043-1354, (A 45 pkt)
Issue year2019
Vol157
Pages610-620
Publication size in sheets0.5
Keywords in EnglishAnticancer drug, photoelectrocatalysis, TiO2 nanotubes, photoelectrodes
ASJC Classification2310 Pollution; 2311 Waste Management and Disposal; 2312 Water Science and Technology; 2302 Ecological Modelling
DOIDOI:10.1016/j.watres.2019.04.010
URL https://doi.org/10.1016/j.watres.2019.04.010
Languageen angielski
Score (nominal)45
ScoreMinisterial score = 45.0, 24-07-2019, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2017 = 2.358; WoS Impact Factor: 2017 = 7.051 (2) - 2017=7.621 (5)
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