Electro-Fenton Treatment of TNT in Aqueous Media in Presence of Cyclodextrin. Application to Ex-situ Treatment of Contaminated Soil
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Minir Murati
Abstract
This preliminary study aims to examine, at laboratory scale, the mechanisms and performances provided by coupling the enhanced solubility abilities of cyclodextrin solutions for removal of 2,4,6-Trinitrotoluene (TNT) from contaminated soil with advanced oxidation processes (AOPs) that are regarded as the most effective approaches in treatment of wastewater contaminated with persistent and toxic organic pollutants. In recent years, different Fenton technologies have turned out to be quite appealing to eliminate recalcitrant organic pollutants. Among the different Fenton-like technologies currently available, indirect electrochemical treatment, namely electro-Fenton process, has appeared to be quite efficient in eliminating refractory organic compounds from aqueous media. HPLC/DAD was employed to monitor the TNT degradation and to identify the aromatic intermediates formed during the electro-Fenton oxidation of TNT. Absolute rate constant of TNT hydroxylation by hydroxyl radicals was determined as 2.06 × 1010 M-1 s-1 using competition kinetics method. Complete mineralization of synthetic solutions was achieved after quite long oxidation time (8 hours). After successive TNT hydroxylations, oxidative opening of the highly oxidized TNT aromatic ring quickly occurred within 20 minutes, leading to the accumulation of two main short chain carboxylic acids such as oxalic and glyoxylic acids. Our results also indicated that cyclodextrin had little effect on the degradation rates of TNT. This relative improvement in TNT degradation could be explained by the formation of the ternary complex (TNT-cyclodextriniron). Degradation of TNT included in cyclodextrin complex was unaffected by hydroxyl radical scavengers which would, in any case, justify the use of a Fenton-like process for the final treatment of soil extract solutions.
© 2016 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Synthesis of TiO2/Au Nanocomposites via Sol-Gel Process for Photooxidation of Methanol
- Design of CeyCoxTi (1-x) O3+δ Perovskite for Photocatalysis: A Statistical Study
- Electro-Fenton Treatment of TNT in Aqueous Media in Presence of Cyclodextrin. Application to Ex-situ Treatment of Contaminated Soil
- A Quantum Mechanical Approach to TiO2 Photocatalysis
- Removal of Color Compounds from Recycled Water Using Combined Activated Carbon Adsorption and AOP Decomposition
- Preparation of Co-doped TiO2 for Photocatalytic Degradation of NOx in Air under Visible Light
- Depletion of Several Antibiotics Used in Industrial Process Using Immobilized TiO2
- Oxidative Pretreatment of Fresh and Mature Landfill Leachate
- Titanium Dioxide onto Polyethylene for Water Decontamination
- Application of Photocatalysis for the Removal of Natural Organic Matter in Simulated Surface and Ground Waters
- Photocatalytic Treatment of A Dye Polluted Industrial Effluent With A Solar Pilot-Scale CPC Reactor
- Evaluation of the Algaecide Activity of Titanium Dioxide on Autoclaved Aerated Concrete
- Degradation of 4-n-nonylphenol in Water by 20 kHz Ultrasound
- Integration of Photocatalysis with Ultrafiltration or Membrane Distillation for Removal of Azo Dye Direct Green 99 from Water
- Binder Effect on Photocatalytic Performance of TiO2 Solution Coating Layers
- Rhodamine B Discolouration on TiO2 in the Cement Environment: A Look at Fundamental Aspects of the Self-cleaning Effect in Concretes
- Effects of Inorganic Anions and Humic Acid on the Photocatalytic and Ozone Oxidation of Oxytetracycline in Aqueous Solution
