Removing Estrogenic Steroids from Waters: The Role of Reducing Hydrated Electron Reactions
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Kimberly A. Rickman
Abstract
The presence of both synthetic and natural steroids in waters is currently one of the most pressing concerns to water treatment utilities. The use of radical-based advanced oxidation/reduction processes (AO/RPs) to augment standard water treatment methods may be of interest. In support of the application of these AO/RP rate constants have been determined for the reaction of the reducing hydrated electron (eaq-) with three important estrogenic steroids; ethinylestradiol, estradiol and progesterone. Absolute values of (1.46 ± 0.16) x 108, (2.52 ± 0.11) x 108 and (8.65 ± 0.15) x 109 M-1 s-1 were directly measured for these three steroids, respectively, using electron pulse radiolysis and absorption spectroscopy. Our value for estradiol is over a factor of 100 slower than the single previously reported rate constant for this compound determined using Co(en)33+ competition kinetics, suggesting that only minimal reduction for this steroid or ethinylestradiol occurs. The faster rate constant for progesterone indicates that the reduction predominantly occurs at its ketone moiety. These rate constants, which are the first direct hydrated electron rate constant measurements reported for estogenic steroids in water, indicate that in comparison to the much faster oxidizing radical reactions reduction will not be a significant destructive pathway in real-world contaminant water treatment.
© 2016 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Application of Fenton’s Reaction for Food-processing Wastewater Treatment
- Degradation of Acid Orange 7 Solution by Air-liquid Gliding Arc Discharge in Combination with TiO2 Catalyst
- Comparing the Formation of Bromate and Bromoform Due to Ozonation and UV-TiO2 Oxidation in Seawater
- Degradation of Ibuprofen Sodium Salt in a Hybrid Photolysis – Membrane Distillation System Utilizing Germicidal UVC Lamp
- Significance of TiO2 Photocatalysis for Green Chemistry
- Electrochemical Treatment of Segregated Effluents from the D-Stage in ECF Kraft Cellulose Bleaching
- A Study on the Removal of Natural Organic Matter and Disinfection Byproducts Formation Potential from Groundwater Using Fenton’s Process
- Investigation of Electric Discharge Sound in Atmospheric Pressure Plasma Using Optical Wave Microphone
- Formal Bimolecular Kinetic Model for the Ozonation of Ciprofloxacin in the Liquid Phase
- Removing Estrogenic Steroids from Waters: The Role of Reducing Hydrated Electron Reactions
- Photocatalytic Inactivation of Escherichia coli with LbL Fabricated Immobilized TiO2 Thin Films
- Solution Combustion Synthesis of BiVO4 Nanoparticles: Effect of Combustion Precursors on the Photocatalytic Activity
- Antibacterial Activity Inhibition after the Degradation of Flumequine by UV/H2O2
- Photocatalytic Degradation of Acid Red G by Bismuth Titanate in Three-phase Fluidized Bed Photoreactor
- Catalytic Epoxidation of Allyl Alcohol with Hydrogen Peroxide under Autogenic Pressure over Ti-MWW Catalyst
- Recent Progress of Nano-Seconds Pulsed Discharge and its Applications
- Ozonation of Municipal Secondary Effluent; Removal of Hazardous Micropollutants and Related Changes of Organic Matter Composition
- Effect of Post-annealing on the Photocatalytic Activity of Hydrothermally Synthesised Titania Nanotubes
- Low Temperature Preparation of Porous Crystalline TiO2 Films Using a Combination of Electrochemical and Electrophoretical Deposition
- Decomposition of Trichloroethylene with Plasma-catalysis: A review
