Iron oxide colloid mobility as affected by solid matrix wetting properties

Show simple item record

dc.identifier.uri http://dx.doi.org/10.15488/4176
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/4210
dc.contributor.author Carstens, J.F.
dc.contributor.author Bachmann, J.
dc.contributor.author Neuweiler, I.
dc.date.accessioned 2018-12-14T13:58:57Z
dc.date.available 2018-12-14T13:58:57Z
dc.date.issued 2018
dc.identifier.citation Carstens, J.F.; Bachmann, J.; Neuweiler, I.: Iron oxide colloid mobility as affected by solid matrix wetting properties. In: Vadose Zone Journal 17 (2018), Nr. 1, 170203. DOI: https://doi.org/10.2136/vzj2017.11.0203
dc.description.abstract The influence of porous media wettability on the mobility of colloids is mostly unknown. In the present work, organic-matter-coated goethite (OMCG) colloids were percolated through three saturated soil materials differing in wettability: untreated quartz sand and two variants of hydrophobized sand. For each type of sand, three ionic strength levels were applied. Derjaguin–Landau–Verwey– Overbeek (DLVO) and Lewis acid–base extended DLVO (XDLVO) interaction energy profiles were calculated according to contact angles and zeta potentials. Flow column results elucidated that decreasing sand wettability had no relevant effect on OMCG colloid mobility. In contrast, colloid retention increased with ionic strength in each type of sand packing. Classic DLVO interactions could predict trends in colloid retention by the respective characteristics of energy barriers and secondary minima. The extension with Lewis acid–base interactions in the XDLVO approach led to the prediction of significant short-range (∼2 nm) attractive interaction energies between colloids and hydrophobized sand, which were not reflected by colloid breakthrough behavior. This was probably due to substantial energy barriers calculated for larger distances (∼27 to ∼75 nm, depending on ionic strength) between the solid matrix and colloids. It is concluded that the distinct surface roughness of sand grains and colloids probably weakened the strength of the short-range attractive interactions, because larger amounts of surface area were still outside the effective distance for the short-range interactions predicted by XDLVO. Regarding colloidal mobility, we concluded for our saturated porous systems that near-surface attractive XDLVO interaction energies between OMCG colloids and hyrophobized sand did not significantly affect colloid mobility. eng
dc.language.iso eng
dc.publisher Washington, DC : Soil Science Society of America
dc.relation.ispartofseries Vadose Zone Journal 17 (2018), Nr. 1
dc.rights CC BY-NC-ND 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject Coated materials eng
dc.subject Energy barriers eng
dc.subject Industrial plants eng
dc.subject Ionic strength eng
dc.subject Iron oxides eng
dc.subject Porous materials eng
dc.subject Sand eng
dc.subject Surface roughness eng
dc.subject Wetting eng
dc.subject Attractive interactions eng
dc.subject Colloid retention eng
dc.subject DLVO-interaction eng
dc.subject Effective distance eng
dc.subject Interaction energies eng
dc.subject Iron oxide colloids eng
dc.subject Short range interactions eng
dc.subject Substantial energy eng
dc.subject Colloids eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.title Iron oxide colloid mobility as affected by solid matrix wetting properties
dc.type article
dc.type Text
dc.relation.issn 15391663
dc.relation.doi https://doi.org/10.2136/vzj2017.11.0203
dc.bibliographicCitation.issue 1
dc.bibliographicCitation.volume 17
dc.bibliographicCitation.firstPage 170203
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


Files in this item

This item appears in the following Collection(s):

Show simple item record

 

Search the repository


Browse

My Account

Usage Statistics