Assessing the Effect of Inorganic Anions on TiO2-Photocatalysis and Ozone Oxidation Treatment Efficiencies
-
Helen Barndõk
,
Luis Cortijo
Abstract
Considering the application of AOPs might be limited for the treatment of industrial wastewater with high inorganic load, and that partial results reported to date regarding this particular are inconclusive, even opposite in some cases, the effect of inorganic anions on the oxidation efficiency of photocatalysis and ozonation has been further assessed with statistical significance. While the presence of sulphate and chloride did not appreciably affect the photocatalytic oxidation of phenol, nitrate significantly enhanced the removal of COD (≈ 8-15%). The addition of carbonate simply increased the pH, which strongly inhibited the photocatalytic process; whereas if pH=5 was kept constant, the reduction of the COD was not affected by the presence of carbonate. On the other hand, sulphate, chloride and nitrate did not significantly affect the degradation of phenol by ozonation; whereas the presence of carbonate apparently enhanced the reduction of COD. It is actually proved that this improvement in the efficiency of the treatment was produced by the pH buffering effect of these ions, rather than to its presence itself, which actually significantly reduced the removal of COD (5-10%) by radical scavenging action in comparison to when the treatment was performed in the absence of anions in the solution adjusting the pH to similar basic values (≈9.5-13.5). When ozonation was performed at a pH close to neutral (6.5 ± 0.2) or basic (12 ± 0.2), at which the indirect oxidation of hydroxyl radical is surely widely active, the results were significantly enhanced in any case (COD removal ≈ 70-75%), whether in the absence or the presence of these anions; despite the significant slight radical scavenging effect (COD removal ≈ 65-70%) that was attributed to the addition of carbonate.
© 2016 by Walter de Gruyter Berlin/Boston
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Artikel in diesem Heft
- Activity of TiO2 Photocatalyst Modified with H2WO4 for Degradation of Organic Compounds in Water
- The Influence of Solution Composition on the Effectiveness of Degradation of Ibuprofen Sodium Salt in a Hybrid Photocatalysis – Membrane Distillation System
- Antifungal Effect of Titanium Dioxide, Indoor Light and the Photocatalytic Process in In Vitro Test on Different Media
- Influence of Contaminants on Arc Properties during Treatment of Polluted Soils in Electric Arc Plasma
- DDT-Contaminated Soil Treatment with Persulfate and Hydrogen Peroxide Utilizing Different Activation Aids and the Chemicals Combination with Biosurfactant
- Landfill Leachate Treatment by Fenton, Photo-Fenton Processes and their Modification
- The Technological Parameters of Hydrochlorination of Glycerol to Dichloropropanols
- Characterization of TiO2 Modified with Bimetallic Ag/Au Nanoparticles Obtained inMicroemulsion System
- Application of Fenton´s Reagent for Acrylic Dyeing Wastewater Decolorization, Organic Matter Reduction and Biodegradability Improvement
- Photocatalytic and Self-cleaning Properties of Titania Coatings Prepared by Inkjet Direct Patterning of a Reverse Micelles Sol-gel Composition
- Decomposition of Microcystis aeruginosa and Microcystin-LR by TiO2 Oxidation Using Artificial UV Light or Natural Sunlight
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- Decolorization of Methyl Orange Solution with Potassium Bromate under UV Irradiation
- Utilization of Ozone Based Techniques for Industrial Effluents Depuration and Reuse
- Hydrogen Peroxide Generation by DC and Pulsed Underwater Discharge in Air Bubbles
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- Treatment of Composted Soils contaminated with Petroleum Hydrocarbons using Chemical Oxidation followed by Enhanced Aerobic Bioremediation
