Photocatalytic Degradation of four Textile Azo Dyes in Aqueous TiO2 Suspensions: Practical Outcomes and Revisited Pathways
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Ghanem Zayani
Abstract
The non-biodegradability of textile wastewaters is mainly due to the presence of synthetic dyes. We have studied the photocatalytic degradation of four commercial (i.e. containing additives) azo dyes (viz. Yellow Cibacron FN-2R, Red Cibacron FN-R, Navy Erionyl R 180%, Everdirect Black VSF) in aqueous suspensions of TiO2 Degussa P25 under irradiation at 365 nm. Measurements performed were: the extent of dark adsorption; the kinetic variations in absorption, TOC and pH; the temporal formations of inorganic ions and carboxylates. In some cases, the effects of initial pH, TiO2 loading and dye concentration were determined. Aside from considerations regarding the practical outcomes, the results are exploited to revisit the photocatalytic degradation pathways of these types of dyes, particularly on the basis of organic chemistry fundamental mechanisms.
© 2016 by Walter de Gruyter Berlin/Boston
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- Photocatalytic Oxidation of Emerging Contaminants: Kinetics and Pathways for Photocatalytic Oxidation of Pharmaceutical Compounds
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- Electrochemical Treatment of Trace Endocrine Disrupting Chemicals with a Three-Dimensional Electrode System
- Semiconductor Mediated Photocatalysed Degradation of a Pesticide Derivative, Acephate in Aqueous Suspensions of Titanium Dioxide
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Articles in the same Issue
- Preface
- Removal of PAHs from Creosote Oil Contaminated Soil by Addition of Concentrated H2O2 and Biodegradation
- Kinetics of Wet Oxidation Reactions
- Biodegradability Enhancement of Wastewater Containing 4-Chlorophenol by Means of Photo-Fenton
- Experimental and Modelling Approach for the Comparison of Fenton and Electro-Fenton Processes. Preliminary Results
- TiO2/C Photocatalyst Prepared by Ethanol Vapour Treatment of TiO(OH)2
- Effects of Carbon Coating on TinO2n-1 for Decomposition of Iminoctadine Triacetate in Aqueous Solution under Visible Light
- Hybrid Plasma-Catalyst System for the Removal of Trichloroethylene in Air
- Photocatalytic Oxidation of Emerging Contaminants: Kinetics and Pathways for Photocatalytic Oxidation of Pharmaceutical Compounds
- Photocatalytic Degradation of four Textile Azo Dyes in Aqueous TiO2 Suspensions: Practical Outcomes and Revisited Pathways
- Decolouration of Dye Solutions Using Photoelectrocatalysis and Photocatalysis
- Aged Raw Landfill Leachate: Membrane Fractionation, H2O2/UV Treatment and Molecular Size Distribution Analysis
- Electrochemical Treatment of Trace Endocrine Disrupting Chemicals with a Three-Dimensional Electrode System
- Semiconductor Mediated Photocatalysed Degradation of a Pesticide Derivative, Acephate in Aqueous Suspensions of Titanium Dioxide
- Hexavalent Chromium Remediation by Bore-Hole Placed Reduction Barriers and Monitored Natural Attenuation
