Elimination of dissolved Fe3+ ions from water by electrocoagulation

Electrocoagulation (EC) was applied for elimination of dissolved Fe 3+ ions from model contaminated water. Electrochemical experiments were performed using a coagulation set-up with the volume of storage tank of 50 L. To represent inorganic contamination, FeCl 3 ·6H 2 O was chosen as a model polluta...

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Bibliographic Details
Published in:Journal of sol-gel science and technology 2018-10, Vol.88 (1), p.49-56
Main Authors: Gaalova, Jana, Krystynik, Pavel, Dytrych, Pavel, Kluson, Petr
Format: Article
Language:English
Subjects:
Aluminum
Aluminum oxide
Ceramics
Chemistry and Materials Science
Coagulation
colloids
Composites
Efficiency
Electrocoagulation
Electrodes
etc.
Experiments
Ferric chloride
Ferric ions
fibers
Flow velocity
Glass
Inorganic Chemistry
Iron chlorides
Materials Science
Nanostructure
Nanotechnology
Natural Materials
Optical and Electronic Materials
Original Paper: Nano-structured materials (particles
Photoelectrons
Power supplies
Scanning electron microscopy
Storage tanks
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Summary:Electrocoagulation (EC) was applied for elimination of dissolved Fe 3+ ions from model contaminated water. Electrochemical experiments were performed using a coagulation set-up with the volume of storage tank of 50 L. To represent inorganic contamination, FeCl 3 ·6H 2 O was chosen as a model pollutant; its concentration was equal to 50 mg/L. Experiments were carried out by circulating model effluent (1 pass) through the cell at a flow rate (40 L/h) whilst operating the power supply in galvanostatic mode. Dosing concentration was varying by changing the input current between set points and holding for sufficient time for steady state to be reached and for a sample to be collected. The process using the steel electrode reached removal efficiency up to 99%, depending on pH, and proved to be very suitable for elimination of dissolved Fe 3+ ions from water. However, electrochemical experiments using the aluminum electrode reached removal efficiency only up to 25%. The different efficiency of two anodes is probably due to lower adsorption capacity of hydrous aluminum oxide for iron ions in comparison to hydrous ferric oxides. Produced nanostructured flocs were subsequently filtered, dried, and characterized by N 2 physisorption, X-ray photoelectron spectroscopy, and scanning electron microscopy. Obtained characteristics synchronously demonstrate different tendencies of Al and Fe nanostructured flocs.
ISSN:0928-0707
1573-4846
DOI:10.1007/s10971-018-4669-z