New Double Electrode System for the Electrochemical Desalination of Building Stones

Jorge Feijoo*, Teresa Rivas, X.R. Nóvoa, Lisbeth M. Ottosen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The application of electrokinetic techniques for the mobilization and the removal of ions present in different porous materials, such as building construction materials, have shown high efficiency with respect to that reached with other techniques. However, some drawbacks related mainly with the mobilization efficiency of the ions of interest and with the integrity of the porous material due to the possible chemical and/or aesthetic damages have still to be overcome to
take advantage of the full potentiality of these techniques. To overcome these limitations the present study evaluates the effectiveness of a new electrokinetic configuration based on the use of two electrodes per compartment that allow modulating the net amount of OH and H+ groups produced at the electrodes’ surface. This effectiveness was evaluated desalinating sandstone samples contaminated with different salts. The results indicate that the new configuration allowed: maintaining a high moisture content, both in poultices and stones, which allowed the treatment to work properly for longer time; to reach high percentages of reduction of all the ions present in the treated stones; to effectively buffer the pH variations due to the possibility of modulate the net amount of OH and H+ groups produced.
Original languageEnglish
JournalInternational Journal of Architectural Heritage
Number of pages16
ISSN1558-3058
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • Desalination
  • Double electrode
  • Electromigration
  • Electroosmosis
  • Sandstone
  • Soluble salts

Cite this

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title = "New Double Electrode System for the Electrochemical Desalination of Building Stones",
abstract = "The application of electrokinetic techniques for the mobilization and the removal of ions present in different porous materials, such as building construction materials, have shown high efficiency with respect to that reached with other techniques. However, some drawbacks related mainly with the mobilization efficiency of the ions of interest and with the integrity of the porous material due to the possible chemical and/or aesthetic damages have still to be overcome totake advantage of the full potentiality of these techniques. To overcome these limitations the present study evaluates the effectiveness of a new electrokinetic configuration based on the use of two electrodes per compartment that allow modulating the net amount of OH− and H+ groups produced at the electrodes’ surface. This effectiveness was evaluated desalinating sandstone samples contaminated with different salts. The results indicate that the new configuration allowed: maintaining a high moisture content, both in poultices and stones, which allowed the treatment to work properly for longer time; to reach high percentages of reduction of all the ions present in the treated stones; to effectively buffer the pH variations due to the possibility of modulate the net amount of OH− and H+ groups produced.",
keywords = "Desalination, Double electrode, Electromigration, Electroosmosis, Sandstone, Soluble salts",
author = "Jorge Feijoo and Teresa Rivas and X.R. N{\'o}voa and Ottosen, {Lisbeth M.}",
year = "2020",
doi = "10.1080/15583058.2018.1561962",
language = "English",
journal = "International Journal of Architectural Heritage",
issn = "1558-3058",
publisher = "Taylor & Francis Inc.",

}

New Double Electrode System for the Electrochemical Desalination of Building Stones. / Feijoo, Jorge; Rivas, Teresa; Nóvoa, X.R.; Ottosen, Lisbeth M.

In: International Journal of Architectural Heritage, 2020.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - New Double Electrode System for the Electrochemical Desalination of Building Stones

AU - Feijoo, Jorge

AU - Rivas, Teresa

AU - Nóvoa, X.R.

AU - Ottosen, Lisbeth M.

PY - 2020

Y1 - 2020

N2 - The application of electrokinetic techniques for the mobilization and the removal of ions present in different porous materials, such as building construction materials, have shown high efficiency with respect to that reached with other techniques. However, some drawbacks related mainly with the mobilization efficiency of the ions of interest and with the integrity of the porous material due to the possible chemical and/or aesthetic damages have still to be overcome totake advantage of the full potentiality of these techniques. To overcome these limitations the present study evaluates the effectiveness of a new electrokinetic configuration based on the use of two electrodes per compartment that allow modulating the net amount of OH− and H+ groups produced at the electrodes’ surface. This effectiveness was evaluated desalinating sandstone samples contaminated with different salts. The results indicate that the new configuration allowed: maintaining a high moisture content, both in poultices and stones, which allowed the treatment to work properly for longer time; to reach high percentages of reduction of all the ions present in the treated stones; to effectively buffer the pH variations due to the possibility of modulate the net amount of OH− and H+ groups produced.

AB - The application of electrokinetic techniques for the mobilization and the removal of ions present in different porous materials, such as building construction materials, have shown high efficiency with respect to that reached with other techniques. However, some drawbacks related mainly with the mobilization efficiency of the ions of interest and with the integrity of the porous material due to the possible chemical and/or aesthetic damages have still to be overcome totake advantage of the full potentiality of these techniques. To overcome these limitations the present study evaluates the effectiveness of a new electrokinetic configuration based on the use of two electrodes per compartment that allow modulating the net amount of OH− and H+ groups produced at the electrodes’ surface. This effectiveness was evaluated desalinating sandstone samples contaminated with different salts. The results indicate that the new configuration allowed: maintaining a high moisture content, both in poultices and stones, which allowed the treatment to work properly for longer time; to reach high percentages of reduction of all the ions present in the treated stones; to effectively buffer the pH variations due to the possibility of modulate the net amount of OH− and H+ groups produced.

KW - Desalination

KW - Double electrode

KW - Electromigration

KW - Electroosmosis

KW - Sandstone

KW - Soluble salts

U2 - 10.1080/15583058.2018.1561962

DO - 10.1080/15583058.2018.1561962

M3 - Journal article

JO - International Journal of Architectural Heritage

JF - International Journal of Architectural Heritage

SN - 1558-3058

ER -