The role of photooxidation and organic matter in Cr(III) and Cr(VI) 1 interactions with poly(lactic acid) microplastics in aqueous solution

There is limited research on the influence of environmental variables on the interactions of biodegradable microplastics with chromium. This study reports the results of adsorption experiments with Cr and poly(lactic acid) (PLA) in synthetic aqueous solutions. It addresses the influence of the initi...

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Autores: Pedroza, Ricardo H.P., David, Calin, Barriada, José Luis, Rey-Castro, Carlos, Lodeiro, Pablo
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Recursos:Universitat de Lleida (UdL)
Repositorio:Repositori Obert UdL
OAI Identifier:oai:repositori.udl.cat:10459.1/467350
Acesso em linha:https://doi.org/10.1016/j.scitotenv.2025.178431
https://hdl.handle.net/10459.1/467350
Access Level:acceso abierto
Palavra-chave:PLA
Biodegradable microplastics
Adsorption
Photooxidation
Chromium
Tannic acid
Humic acid
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spelling The role of photooxidation and organic matter in Cr(III) and Cr(VI) 1 interactions with poly(lactic acid) microplastics in aqueous solutionPedroza, Ricardo H.P.David, CalinBarriada, José LuisRey-Castro, CarlosLodeiro, PabloPLABiodegradable microplasticsAdsorptionPhotooxidationChromiumTannic acidHumic acidThere is limited research on the influence of environmental variables on the interactions of biodegradable microplastics with chromium. This study reports the results of adsorption experiments with Cr and poly(lactic acid) (PLA) in synthetic aqueous solutions. It addresses the influence of the initial oxidation state, Cr(III) or Cr(VI), the effects of UV irradiation and the presence of organic matter. The results indicate that pristine PLA has a low affinity for Cr (between 0.05 and 46 μg/g) across varying pH levels, ionic strengths, and microplastic concentrations. However, the presence of organic matter (OM), represented by humic and tannic acids, resulted in 5.2-fold and 620-fold increases for Cr(III) and Cr(VI) adsorption, respectively. Possible mechanisms for that behavior are discussed, including Cr-OM complexation and formation of surface coatings. Noteworthy, we demonstrate that Cr(VI) adsorption involves a coupled redox-complexation process that appears to be related to the antioxidant potential of OM. Indeed, the ratio of (poly)phenol content of tannic and humic acids (6.23) is consistent with the ratio of Cr(VI) reduction in presence of both acids (6.97). Finally, photooxidation of PLA enhanced Cr(III) and Cr(VI) adsorption by a factor of 60 and 15, respectively. This is primarily attributed to UV-induced changes in surface chemical groups (increased oxygen content), rather than a change in surface area. This research provides key insights into the behavior of PLA as a potential Cr carrier, revealing the importance of organic matter and the photoaging of microplastics in the mobility of trace metal pollutants in the environment.This project has received funding from the European Union's H2020 research and innovation programme under Marie Sklodowska-Curie grant agreement N° 801586. The authors thank Agencia Española de Investigación for the financial support through the research project MCIN/AEI/10.13039/501100011033 (grant numbers PID2019-107033GB-C21, PID2020-117910GB-C21, and PID2022-140312NB-C21). P. Lodeiro also acknowledges current support by the Ministerio de Ciencia, Innovación y Universidades of Spain, and University of Lleida (Beatriz Galindo Senior award number BG20/00104).Elsevier2025info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttps://doi.org/10.1016/j.scitotenv.2025.178431https://hdl.handle.net/10459.1/467350reponame:Repositori Obert UdL instname:Universitat de Lleida (UdL)Inglésinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-107033GB-C21info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-117910GB-C21info:eu-repo/grantAgreement/AEI/PID2022-140312NB-C21/ESReproducció del document publicat a: https://doi.org/10.1016/j.scitotenv.2025.178431Science of The Total Environment, 2025, vol. 963, núm. 178431, p. 1-11info:eu-repo/grantAgreement/EC/H2020/801586cc-by (c) Ricardo H. P. Pedroza et al., 2025Attribution-NonCommercial-NoDerivatives 4.0 Internationalinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/oai:repositori.udl.cat:10459.1/4673502026-06-24T12:42:17Z
dc.title.none.fl_str_mv The role of photooxidation and organic matter in Cr(III) and Cr(VI) 1 interactions with poly(lactic acid) microplastics in aqueous solution
title The role of photooxidation and organic matter in Cr(III) and Cr(VI) 1 interactions with poly(lactic acid) microplastics in aqueous solution
spellingShingle The role of photooxidation and organic matter in Cr(III) and Cr(VI) 1 interactions with poly(lactic acid) microplastics in aqueous solution
Pedroza, Ricardo H.P.
PLA
Biodegradable microplastics
Adsorption
Photooxidation
Chromium
Tannic acid
Humic acid
title_short The role of photooxidation and organic matter in Cr(III) and Cr(VI) 1 interactions with poly(lactic acid) microplastics in aqueous solution
title_full The role of photooxidation and organic matter in Cr(III) and Cr(VI) 1 interactions with poly(lactic acid) microplastics in aqueous solution
title_fullStr The role of photooxidation and organic matter in Cr(III) and Cr(VI) 1 interactions with poly(lactic acid) microplastics in aqueous solution
title_full_unstemmed The role of photooxidation and organic matter in Cr(III) and Cr(VI) 1 interactions with poly(lactic acid) microplastics in aqueous solution
title_sort The role of photooxidation and organic matter in Cr(III) and Cr(VI) 1 interactions with poly(lactic acid) microplastics in aqueous solution
dc.creator.none.fl_str_mv Pedroza, Ricardo H.P.
David, Calin
Barriada, José Luis
Rey-Castro, Carlos
Lodeiro, Pablo
author Pedroza, Ricardo H.P.
author_facet Pedroza, Ricardo H.P.
David, Calin
Barriada, José Luis
Rey-Castro, Carlos
Lodeiro, Pablo
author_role author
author2 David, Calin
Barriada, José Luis
Rey-Castro, Carlos
Lodeiro, Pablo
author2_role author
author
author
author
dc.subject.none.fl_str_mv PLA
Biodegradable microplastics
Adsorption
Photooxidation
Chromium
Tannic acid
Humic acid
topic PLA
Biodegradable microplastics
Adsorption
Photooxidation
Chromium
Tannic acid
Humic acid
description There is limited research on the influence of environmental variables on the interactions of biodegradable microplastics with chromium. This study reports the results of adsorption experiments with Cr and poly(lactic acid) (PLA) in synthetic aqueous solutions. It addresses the influence of the initial oxidation state, Cr(III) or Cr(VI), the effects of UV irradiation and the presence of organic matter. The results indicate that pristine PLA has a low affinity for Cr (between 0.05 and 46 μg/g) across varying pH levels, ionic strengths, and microplastic concentrations. However, the presence of organic matter (OM), represented by humic and tannic acids, resulted in 5.2-fold and 620-fold increases for Cr(III) and Cr(VI) adsorption, respectively. Possible mechanisms for that behavior are discussed, including Cr-OM complexation and formation of surface coatings. Noteworthy, we demonstrate that Cr(VI) adsorption involves a coupled redox-complexation process that appears to be related to the antioxidant potential of OM. Indeed, the ratio of (poly)phenol content of tannic and humic acids (6.23) is consistent with the ratio of Cr(VI) reduction in presence of both acids (6.97). Finally, photooxidation of PLA enhanced Cr(III) and Cr(VI) adsorption by a factor of 60 and 15, respectively. This is primarily attributed to UV-induced changes in surface chemical groups (increased oxygen content), rather than a change in surface area. This research provides key insights into the behavior of PLA as a potential Cr carrier, revealing the importance of organic matter and the photoaging of microplastics in the mobility of trace metal pollutants in the environment.
publishDate 2025
dc.date.none.fl_str_mv 2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1016/j.scitotenv.2025.178431
https://hdl.handle.net/10459.1/467350
url https://doi.org/10.1016/j.scitotenv.2025.178431
https://hdl.handle.net/10459.1/467350
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-107033GB-C21
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-117910GB-C21
info:eu-repo/grantAgreement/AEI/PID2022-140312NB-C21/ES
Reproducció del document publicat a: https://doi.org/10.1016/j.scitotenv.2025.178431
Science of The Total Environment, 2025, vol. 963, núm. 178431, p. 1-11
info:eu-repo/grantAgreement/EC/H2020/801586
dc.rights.none.fl_str_mv cc-by (c) Ricardo H. P. Pedroza et al., 2025
Attribution-NonCommercial-NoDerivatives 4.0 International
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
rights_invalid_str_mv cc-by (c) Ricardo H. P. Pedroza et al., 2025
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositori Obert UdL
instname:Universitat de Lleida (UdL)
instname_str Universitat de Lleida (UdL)
reponame_str Repositori Obert UdL
collection Repositori Obert UdL
repository.name.fl_str_mv
repository.mail.fl_str_mv
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