Determination of optimum extinction wavelength for paracetamol removal through energy efficient thin film reactor
| Autor: | Aysegul Pala, Tolga Tunçal, Deniz İzlen Çifçi, Orhan Uslu |
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| Přispěvatelé: | Çifçi, D.I., Tunçal, T., Pala, A., Uslu, O., Yeditepe Üniversitesi |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Chemistry
General Chemical Engineering Intermediates Kinetics Analytical chemistry General Physics and Astronomy Hole blocking 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Dip-coating 0104 chemical sciences Ultraviolet visible spectroscopy X-ray photoelectron spectroscopy Energy optimization Paracetamol degradation Photocatalysis Irradiation Thin film 0210 nano-technology Visible spectrum TiO2 thin film |
| Popis: | Paracetamol (PAM) mineralization through nano-composite thin film (TF) based photocatalytic system was investigated under variable operational conditions. The experiments were conducted using a non-stirred flow through coated tubular quartz reactor (TQR). Elimination of energy demand arising from stirring and aeration through the developed TF reactor configuration was also among the main research interests. Ag-doped Si-TiO2 TFs were grown on Si-decorated inner surface of the TQR using sol-gel dip coating technique. The fabricated TF was characterized by SEM-EDS, TEM, AFM, XPS and UVvis spectroscopy methods. TF-based PAM mineralization kinetics were observed for both UVvis and UV wavelengths using pure, Si-Ti and Ag-doped Si-TiO2 TF(s). The direct and indirect optical ban gap energies (BGE) for the Ag doped Si-TiO2 TF were estimated to be 2.56 eV and 2.86 eV respectively. While no visible light activity was observed for pure TiO2 TF, Ag-doped Si-TiO2 TF exhibited significant PAM degradation activity for ? > 400 nm with a kobs value of 2.1 ± 0.1 10-3 min-1. In addition to known phenolic and carboxylated intermediates, UVvis spectroscopy, HPLC-MS and UPLC-MS/MS measurements indicated ?-cyano-4-hydroxicinnamic acid (?PHC) formation as a result of photo-addition reactions under UV C irradiation. Experimental results also indicated that ?PHC blocks h+/e- formation completely. Paracetamol could be degraded economically under UV B irradiation through the fabricated TF reactor without stirring, aeration or adding external electron acceptors. © 2016 Elsevier B.V. All rights reserved. 111Y209 This work is partially funded by The Scientific and Technological Research Council of Turkey TÜBİTAK (Project 111Y209). The authors express their gratitude to Food Antioxidants Measurement & Application Center for the support given to the projects. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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