2018-Sustainable Industrial Processing Summit
SIPS2018 Volume 2. Amatore Intl. Symp. / on Electrochemistry for Sustainable Development
| Editors: | F. Kongoli, H. Inufasa, M. G. Boutelle , R. Compton, J.-M. Dubois, F. Murad |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2018 |
| Pages: | 216 pages |
| ISBN: | 978-1-987820-84-3 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Photocatalytic Degradation of Methyl Orange Dye in a Tubular Flow Reactor Using Nanotubular Oxides Grown on Ti0.5W Alloy
Joyce Carvalho1; Milene Codolo2; Christiane Rodrigues2;1FEDERAL UNIVERSITY OF SAO PAULO, Diadema, Brazil; 2FEDERAL UNIVERSITY OF SãO PAULO, Diadema, Brazil;
Type of Paper: Regular
Id Paper: 251
Topic: 47
Abstract:
Methyl Orange is a dye with strong color, used in dyeing and textile printing. When present in effluents, it may contaminate rivers, lakes, and aquifers, causing health risks to living organisms [1]. Textile industries produce large volumes of effluents with high concentrations of dyes, which can become recalcitrant products that are difficult to remove by conventional processes [2]. As an alternative, new technologies have emerged, including heterogeneous phototacalysis, whose principle is based on the irradiation of a semiconductor to the generation of electrons/holes where the reactions of reduction/oxidation occur, favoring the production of hydroxyl radicals (strong oxidizing agent) [3]. The main objective of this work is to degrade the methyl orange dye by photocatalytic processes using a tubular flow reactor containing as photocatalyst nanostructured oxides grown on Ti0.5W alloy. There are few publications in the area of design and construction of flow reactors using nanotube oxides as photoanode [4]. The reactor operated in batch mode with recirculation. The Ti0.5W alloy was prepared in an arc-voltaic furnace, roll processed, and anodized at 120 V for 30 minutes in order to obtain a layer of nanostructured oxide (nanotube form) on alloy surface. As this oxide layer is amorphous, the nanostructures were submitted to heat treatment at 450 °C to obtain a crystalline structure, preferably anatase. The photocatalyst was inserted into the reactor and irradiated by a UV lamp (125 W). The results showed that the processes of photocatalysis and photoelectrocatalysis significantly reduced the absorbance in the visible UV spectrum and the total organic carbon values. However, photoelectrocatalysis presented better performance compared to photocatalysis. In addition, the experiments were carried out at different flow rates, and showed that the increase in flow rate contributes to an increase in the dye removal efficiency.
Keywords:
Catalysis; Electrochemical devices; Electrochemistry;References:
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