Removal of the Methylene Blue Dye (MB) with Catalysts of Au-TiO2: Kinetic and Degradation Pathway
Open Access
- 1 January 2021
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in Modern Research in Catalysis
- Vol. 10 (01), 1-14
- https://doi.org/10.4236/mrc.2021.101001
Abstract
Au-TiO2 catalysts were used in the photocatalytic degradation of the methylene blue dye (MB). The synthesis of titanium oxide (TiO2) was carried out by sol-gel method. Subsequently, particles of Au were deposited on the surface of the semiconductor by photo-deposition, thus modifying the surface of the semiconductor. For the characterization of the catalyst obtained, the techniques of X-ray Diffraction (DRX), Scanning Electron Microscopy (SEM), Spectroscopy with Diffuse Reflectance (DR) and Surface Area by the BET (Brunauer, Emmett y Teller) were used. The solid obtained was tested experimentally as a catalyst in the photocatalytic degradation of a solution of MB. The data obtained were analyzed by UV-vis Spectroscopy and Total Organic Carbon (TOC) and the results indicated conversions were greater than 80%. The intermediate products were evaluated by mass coupled gas chromatography (GC-MS) and the MB decomposition route was by hydroxylation, obtaining aromatic intermediates, esters and products of the chemical degradation of the molecule.Keywords
This publication has 25 references indexed in Scilit:
- Optical, structural and photocatalysis properties of Cu-doped TiO 2 thin filmsApplied Surface Science, 2017
- Bio-mediated Sm doped nano cubic zirconia: Photoluminescent, Judd–Ofelt analysis, electrochemical impedance spectroscopy and photocatalytic performanceJournal of Alloys and Compounds, 2016
- Removal of methylene blue and mechanism on magnetic γ-Fe2O3/SiO2 nanocomposite from aqueous solutionWater Resources and Industry, 2016
- Adsorption of rhodamine B and methylene blue dyes using waste of seeds of Aleurites Moluccana, a low cost adsorbentAlexandria Engineering Journal, 2016
- Removal of methylene blue and rhodamine B from water by zirconium oxide/grapheneWater Science, 2016
- Influence of crystal structure of nanosized ZrO2 on photocatalytic degradation of methyl orangeNanoscale Research Letters, 2015
- Strategies for improving the efficiency of semiconductor metal oxide photocatalysisMater. Horiz., 2014
- Synthesis and characterization of novel poly(1-naphthylamine)/zinc oxide nanocomposites: Application in catalytic degradation of methylene blue dyeColloid and Polymer Science, 2010
- Removal of methylene blue from wastewater using fly ash as an adsorbent by hydrocycloneJournal of Hazardous Materials, 2008
- Photocatalytic degradation pathway of methylene blue in waterApplied Catalysis B: Environment and Energy, 2001