Kinetics of ethyl paraben degradation by simulated solar radiation in the presence of N-doped TiO 2 catalysts
Abstract
Ethyl paraben (EP), an emerging micro-pollutant representative of the parabens family, has been subject to photocatalytic degradation under simulated solar radiation at a photon flux of 1.3·10(-4) E/(m(2) s). Six nitrogen-doped titania catalysts synthesized by annealing a sol-gel derived TiO2 powder under ammonia flow and their un-doped counterparts, calcined in air at different temperatures in the range 450-800 °C, were compared under solar and visible light and the most active one (N-doped TiO2 calcined at 600 °C) was used for further tests. Experiments were performed at EP concentrations between 150 and 900 μg/L, catalyst loadings between 100 and 1000 mg/L, pH between 3 and 9, different matrices (ultrapure water, water spiked with humic acids or bicarbonates, drinking water and secondary treated wastewater) and hydrogen peroxide between 10 and 100 mg/L. For EP concentrations up to 300 μg/L, the degradation rate can be approached by first order kinetics but then shifts to lower order as the concentration increases. The rate increases linearly with catalyst loading up to 750 mg/L and hydrogen peroxide up to 100 mg/L. Near-neutral (pH = 6.5-7.5) and alkaline conditions (pH = 9) do not affect degradation, which is reduced at acidic pH. The presence of humic acids at 10-20 mg/L impedes degradation due to the competition with EP for the oxidizing species and this is more pronounced in actual wastewater matrices. UPLC-ESI-HRMS and HPLC-DAD were employed to follow EP concentration changes, as well as identify and quantify transformation by-products during the early stages of the reaction. Five such products were successfully detected and, based on their concentration-time profiles, a reaction network for the degradation of EP is proposed. Hydroxyl radical reactions appear to prevail during the initial steps as evidenced by the rapid formation of hydroxylated and dealkylated intermediates.
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The reduction in the efficiency of this kind of AOP is reported for pollutants, such as phenanthrene, naphthalene, BTEX, phenolic compounds, dichloroethane, parabens, etc.
“The reduction in the efficiency of this kind of AOP is reported for pollutants, such as phenanthrene, naphthalene, BTEX, phenolic compounds, dichloroethane, parabens, etc. [133-136].”
From Advanced Oxidation Processes for Degradation of Water Pollutants—Ambivalent Impact of Carbonate Species: A Review (2023) · cites this paper as [136]
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Self-citation
- Authors
- Petala, A., Frontistis, Z., Antonopoulou, M., Konstantinou, I., Kondarides, D. I., & Mantzavinos, D.
- Affiliations
- University of Patras (GR)
- Corresponding author
- Mantzavinos, Dionissios
- Venue
- Water Research
- Publisher
- Elsevier BV
- Published
- 2015-09
- Volume
- 81
- Pages
- 157-166
- ISSN
- 0043-1354 (ISSN-L)
- OpenAlex
- W1486689750
- Cited by
- 113
- References
- 43
- Citations by year
- 2026: 1 · 2025: 3 · 2024: 8 · 2023: 10 · 2022: 6 · 2021: 17 · 2020: 14 · 2019: 17 · 2018: 11 · 2017: 12 · 2016: 13 · 2015: 1
- FWCI
- 8.17
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Water Research (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Research Committee of the University of Patras (E056)
- European Union (European Social Fund ESF)
- Greek National Funds
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
- Keywords
- ethylparaben, parabens, photocatalytic degradation, nitrogen-doped TiO2, simulated solar radiation, degradation kinetics, hydrogen peroxide, humic acid, pH effect, reaction networks, hydroxyl radicals, wastewater treatment, micropollutants
- MeSH terms
- Catalysis, Humic Substances, Hydrogen-Ion Concentration, Kinetics, Light, Parabens, Photolysis, Sunlight, Titanium, Water Pollutants, Chemical, Water Purification, Drinking Water, Wastewater
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