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Article

Electroadsorption of Bromide from Natural Water in Granular Activated Carbon

1
Alicante Water Works, Alona Street 31, 03009 Alicante, Spain
2
Institute of Materials, University of Alicante, Apartado 99, 03080 Alicante, Spain
3
Institute of Water, Department of Civil Engineering, University of Granada, Ramón y Cajal Street, 4, 18071 Granada, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Chicgoua Noubactep
Water 2021, 13(5), 598; https://doi.org/10.3390/w13050598
Received: 20 December 2020 / Revised: 15 February 2021 / Accepted: 16 February 2021 / Published: 25 February 2021
(This article belongs to the Special Issue Biofiltration and Physicochemical Filtration for Water Treatment)
The adsorption and electroadsorption of bromide from natural water has been studied in a filter-press electrochemical cell using a commercial granular activated carbon as the adsorbent. During electroadsorption experiments, different voltages were applied (2 V, 3 V and 4 V) under anodic conditions. The presence of the electric field improves the adsorption capacity of the activated carbon. The decrease in bromide concentration observed at high potentials (3 V or 4 V) may be due to the electrochemical transformation of bromide to Br2. The anodic treatment produces a higher decrease in the concentration of bromide in the case of cathodic electroadsorption. Moreover, in this anodic electroadsorption, if the system is again put under open circuit conditions, no desorption of the bromide is produced. In the case of anodic treatment in the following adsorption process after 24 h of treatment at 3 V, a new decrease in the bromide concentration is observed as a consequence of the decrease in bromide concentration after the electrochemical stage. It can be concluded that the electroadsorption process is effective against the elimination of bromide and total bromine in water, with a content of 345 and 470 µg L−1, respectively, reaching elimination values of 46% in a single-stage electroadsorption process in bromide and total bromine. The application of the electric field to the activated carbon with a positive polarization (anodic electroadsorption) increases the adsorption capacity of the activated carbon significantly, achieving a reduction of up to 220 µg L−1 after 1 h of contact with water. The two stage process in which a previous electrochemical oxidation is incorporated before the electroadsorption stage significantly increased the efficiency from 46% in a single electroadsorption step at 3 V, to 59% in two stages. View Full-Text
Keywords: electroadsortion; granular activated carbon; thrialomethanes; bromides electroadsortion; granular activated carbon; thrialomethanes; bromides
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MDPI and ACS Style

Ribes, D.; Morallón, E.; Cazorla-Amorós, D.; Osorio, F.; García-Ruiz, M.J. Electroadsorption of Bromide from Natural Water in Granular Activated Carbon. Water 2021, 13, 598. https://doi.org/10.3390/w13050598

AMA Style

Ribes D, Morallón E, Cazorla-Amorós D, Osorio F, García-Ruiz MJ. Electroadsorption of Bromide from Natural Water in Granular Activated Carbon. Water. 2021; 13(5):598. https://doi.org/10.3390/w13050598

Chicago/Turabian Style

Ribes, David, Emilia Morallón, Diego Cazorla-Amorós, Francisco Osorio, and María J. García-Ruiz. 2021. "Electroadsorption of Bromide from Natural Water in Granular Activated Carbon" Water 13, no. 5: 598. https://doi.org/10.3390/w13050598

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