Photocatalytic ozonation using doped TiO2 catalysts for the removal of parabens in water
| Autor: | Inês Leal, Marta Gmurek, Magdalena Diak, M. Emília Quinta-Ferreira, Rui C. Martins, Marek Stelmachowski, João Gomes, Katarzyna Bednarczyk, Rosa M. Quinta-Ferreira, Raquel Costa |
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| Rok vydání: | 2017 |
| Předmět: |
Environmental Engineering
Ozone Chemistry Chemical oxygen demand 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Pollution Mineralization (biology) Catalysis Hydroxylation chemistry.chemical_compound Wastewater Environmental chemistry Photocatalysis Environmental Chemistry Degradation (geology) 0210 nano-technology Waste Management and Disposal 0105 earth and related environmental sciences |
| Zdroj: | Science of The Total Environment. 609:329-340 |
| ISSN: | 0048-9697 |
| DOI: | 10.1016/j.scitotenv.2017.07.180 |
| Popis: | Conventional wastewater treatments are inefficient for the removal of parabens. The aim of this study was finding a suitable solution using ozone and UVA irradiation combined with TiO2 catalysts doped with different noble metals (Ag, Pt, Pd, Au). Photocatalytic ozonation required lower amounts of ozone for higher efficiency on the removal of parabens, chemical oxygen demand (COD) and total organic carbon (TOC). The best catalyst for the initial contaminants degradation was 0.5% Ag-TiO2 leading to total parabens removal using 46 mgO3/L. Due to the relative low mineralization achieved, the toxicity of the treated solutions was still compared with the initial one over several species (Vibrio fischeri, Lepidium sativum and Corbicula fluminea). All the treatments applied led to a clear decrease on the toxicity compared with initial mixture of parabens. From an economical point of view, it was concluded that the presence of UVA irradiation increased the energy consumption compared with catalytic ozonation with these catalysts but it can decrease the time of reaction. From the by-products analysis, it was concluded that hydroxylation appears to be the most significant reaction pathway and the main responsible for parabens degradation. |
| Databáze: | OpenAIRE |
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